HornetQ 2.0 broke records and defeated top-ranked messaging services in benchmark tests. Why wasn't it widely adopted? Software vendors make all kinds of claims about their products, but what developers care about is proof. When testing a new product, it's important to see how it stacks up against its competition. For years, researchers at UT Darmstadt have compared the performance of message-oriented middleware servers based on Java Messaging Service (JMS). In 2010, the SPECjms2007 benchmark record was smashed by HornetQ, an open-source enterprise messaging system from JBoss. At the time, SPECjms2007 was the industry-standard benchmark for JMS systems. While the benchmark has since been retired, it provided a framework for detailed performance analysis as well as workload and performance metrics for the products being analyzed. The framework considered all components that were a part of the application environment, including hardware, JMS server software, JVM software, database software if used for message persistence, and the system network. It used horizontal and vertical topologies as scalability networks. During the test, HornetQ 2.0 was directly compared to Apache ActiveMQ 5.3, another JMS system that was known for its speed at the time. To ensure consistency, both messaging systems were tested on an IBM x3850 system utilizing identical OS setups. Not only did HornetQ completely decimate the records set by ActiveMQ, but it managed to smash all SPECjms2007 benchmarks at the time. While HornetQ 2.0 didn't have the reputation of ActiveMQ, it had proven that it was faster than every other message broker on the scene. In fact, HornetQ 2.0's scores were a staggering 307% higher than any previous results published by SPECjms2007. Shortly after the tests, DZone interviewed Tim Fox, who was HornetQ's project lead. During the interview, he discussed the main factors that contributed to HornetQ's impressive performance. HornetQ utilized Netty, a low‑level Java NIO library written by the author of Apache MINA. The JMS system also had a secret weapon, which Fox explained: "This system is a very high‑performance journal, which is basically written in 99‑percent Java. But we also have a small layer of native code that's accessed by JNI. And what this does is, when you're running on Linux, it detects that you're running on Linux, and then it automatically enables a bit of native code, which allows us to pass into Linux asynchronous file IO. And basically, what this does is it allows us to get much faster persistence than would be possible in pure Java." Netty Architecture After HornetQ's record-smashing benchmark test, the messaging system released several updates. Later that year, HornetQ released its 2.1.0 update, which refined the original release. It was followed up by several more updates added new features, like Vert.x integration, and strove to improve upon the original JMS system. Competition is a vital aspect of innovation, and when HornetQ broke records, it brought plenty of new competitors to the scene. These competitors included RabbitMQ, a messaging broker written in Erlang, and SonicMQ, a message queuing system that's now known as Aurea Messenger. In spite of HornetQ's incredible speed, however, it failed to surpass its biggest competitor. Near the end of 2014, the codebase for HornetQ was donated to the Apache ActiveMQ community. Today, it exists as an Active MQ subproject called Artemis. At one point in time, HornetQ was faster than any other available enterprise messaging system. It offered a full enterprise feature set that could easily stand side-by-side against ActiveMQ and even offered some features that ActiveMQ was lacking. Since HornetQ was not built around JMS, it was also protocoled agnostic, which was another major advantage People that used HornetQ had plenty of praise for its features. Its management API made it easy to work with, and its NIO optimizations were appealing to many users. HornetQ also had detailed documentation, making it easy for users to learn what they needed to know. It’s clear that HornetQ 2.0 had many advantages, so why did it fail to find a wide audience? It's possible that the JMS struggled because ActiveMQ was already widely adopted at the time of its release. ActiveMQ fell short of Hornet 2.0 in those benchmark tests, but it still had a high adoption rate and name recognition. Even though HornetQ got plenty of attention when it broke benchmark records, future updates didn’t receive the same level of coverage. Because of this, many potential users may not have been aware of the new features that HornetQ added. Many people were drawn to ActiveMQ because of its reputation as a stable messaging system. Users were unwilling to take risks on a lesser-known system like HornetQ and continued to stick with ActiveMQ, which had already proven that it was reliable. Some people were unwilling to trust sensitive data to a system that they didn’t know much about. Beyond that, open-source JMS providers are highly reliant on the surrounding community. With an active community of users, it's easier to troubleshoot issues and find solutions to problems. Since ActiveMQ had more community interest than HornetQ, it eventually fell behind its competitor. Today, ActiveMQ serves as a speedy communication bridge that allows for messaging between two or more applications, even if they're written in a different programming language. It's still known for its speed, but it's also known for its reliability. The ActiveMQ message broker allows for communication between system components even when one of the components is down. ActiveMQ was able to correct the issues that lead to its defeat in those benchmark tests, adding new features and improved functionality. It can be integrated with the Apache Camel Framework, making it possible to read and write messages between the two systems. New features have been added with every iteration of ActiveMQ, which have helped to improve its speed and its flexibility. These features include STOMP and UDP support, mirrored queues, and broker clustering. It's used by many major companies, including SquareTrade, Cox Communications, and ClearScale. Even though HornetQ is no longer updated, it lives on in ActiveMQ, the JMS it defeated in its record-breaking benchmark test. You can see its influence in other JMS providers as well, like ActiveMQ's main competitor, Kafka. HornetQ may not be in use today, but that doesn't mean it should be forgotten. Modern developers can still learn from the way HornetQ enhanced Java with just a few lines of native code. Artemis, the ActiveMQ subproject that’s specifically based on HornetQ’s code, is intended to be a next-generation ActiveMQ broker. It currently serves as a successor to the ActiveMQ classic. According to Apache’s Artemis roadmap, it could eventually serve as the next significant version of ActiveMQ. Currently, Artemis offers protocol support for Stomp, OpenWire, MQTT, and more. It offers features like replicated message store and message scheduling. In the future, Apache intends to add additional features to enhance Artemis, such as pluggable dispatch policies and configurable IO exception handling. Even though HornetQ is no longer updated, it lives on in ActiveMQ, the JMS it defeated in its record-breaking benchmark test. HornetQ may not be in use today, but that doesn’t mean it should be forgotten. Artemis may eventually become the next-generation messaging broker that many people hoped HornetQ would some be.

You can now get email accounts with the Windows Phone Emulator. With this Mail app, you can have all your email accounts in one place. You don’t have to access your emails to different websites or apps. While you couldn't do this easily in the past, you can use the Windows Phone Emulate to do this. Windows Phone Emulator is a tool that comes with various features for development. For instance, documentation, emulator images, tools for Visual Studio, and obtaining a sample code. What is Microsoft Emulator? Microsoft Emulator is a desktop application that emulates a Windows 10 Mobile device. You have to use Microsoft Emulator in conjunction with Visual Studio, it will be a virtually great environment where a developer can debug and test universal windows apps. It can also be an Android emulator that allows your mobile to imitate Android OS features on your PC. You can install Android Apps on your computer or laptop and use them natively. The Microsoft Emulator is a valuable tool for both developers and Android users. This tool helps you to test applications to use various Windows mobile devices. You may use it to test your projects, especially the mobile device management strategy. Here is an example of a code snippet: PhoneCallTask task = new PhoneCallTask(); task.PhoneNumber = "000000000"; task.DisplayName = "User K. User"; task.Show(); Deployment process There is a deployment process that you should use to install the emulator. Although you need to ensure the capacity of your computer can allow you to do that. Windows recommends that you ensure that your computer runs on the Windows 10 Anniversary Update. For example, you may need to run a 64-bit professional edition of Windows. To start the process, you need to access this Microsoft website and download the emulator. Typically, it will have EmulatorSetup.exe. Launching the Windows 10 Mobile Emulator The easiest way to launch the emulator is to select the Microsoft Windows 10 Mobile Emulator. Once you choose it, it will take you to the next screen. But there are several things that you need to pay attention to. First and foremost, you'll notice different emulator configurations. If you look closely at the screen capture above, you will notice that options near the bottom of the window reference newer version numbers than the options closer to the top of the window. Ultimately, you would need to access the hub to develop. You can activate the application successfully; it will send you to the background. However, you couldn't care less about the number and the name. All you need is to be able to access the People Hub. Once the task is activated, and my application is sent to the background, you're faced with a fake call: The next step is to add a person to a call, so I am clicking on Add Call and that's all I needed. Now I am able to click on the People button and navigate to the People Hub (otherwise locked in the OS): Now a swipe to the left, and you’re able to see the What's New panorama slide. Here is where it gets interesting. Even if the user is prompted with a message to add a Twitter or Facebook account, there is no way those can be added with the locked version of the emulator. Initially, there is the Google option (for GMail): Any Google account will do here, and once you enter the correct credentials, you will be able to access the connected inbox from the emulator. So the next question - where exactly is Yahoo, since I mentioned it? It is hidden a bit deeper than this, and it is invoked directly from a system application. To be specific - from the built-in email client. Since Gmail is already configured, open the client and expand the application bar: Click on Add Email Account, and there you will see that now Yahoo appeared in the list of available providers. The reason Yahoo only appears here is because it is not integrated with the People hub and is only available to manage email. You can set it up the same way as you set up the Google account, as long as you have the proper credentials. Congratulations! Now you have real email accounts set up and synced in the emulator! Now, whenever I am using the EmailComposeTask: EmailComposeTask task = new EmailComposeTask(); task.To = "[email protected]"; task.Subject = "Hello!"; task.Body = "Hello there!"; task.Show(); I will be prompted to select one of the existing accounts: My Thoughts on My Windows Phone and Windows 10 A few days ago Microsoft finally announced that some of the old(er) Windows phones would soon get the new shiny OS. That left a few Windows phone owners a little disappointed. I remember that only a few months ago it was clear that all (or, at least, most) windows phone devices would be updated to Windows 10 and now it seems that they would, in fact, keep running windows 8.1. As the proud owner of one Lumia 925 – I feel a little cheated, but not surprised. I have used the insider builds of the latest and greatest for a few weeks, and while I enjoyed using the new OS it was not “production-ready” just yet. I remember that only a few months ago it was clear that all (or, at least, most) windows phone devices would be updated to Windows 10 and now it seems that they would, in fact, keep running windows 8.1. As the proud owner of one Lumia 925 – I feel a little cheated, but not surprised. I have used the insider builds of the latest and greatest for a few weeks, and while I enjoyed using the new OS it was not “production-ready” just yet. What Is a Simulator? A simulator is a piece of software that allows your computer to execute programs designed for a different operating system. Unlike Android devices, which can be easily imitated, they are primarily developed for iPhone and iPad devices. By sitting on top of the computer's operating system, iOS simulators imitate iOS and execute the relevant application within it. However, to use the iOS simulator, you must use Mac OS X because it requires Apple's native Cocoa API. This Cocoa API is required for the GUI, runtime, and various other tasks. Because of this posture, developers must either work on the MacBook or virtualize macOS on their existing systems. Simulators, in contrast to emulators, do not imitate hardware. As a result, while utilizing simulators for testing, certain capabilities such as cellular interrupts, battery utilization, and so on are not possible to study. When to Use Emulators On the other hand, emulators are extremely valuable for testing how software interacts with underlying hardware or a combination of hardware and software. Do you want to discover if a firmware update will cause issues with your software? An emulator can assist you in figuring this out. Alternatively, you could want to know how your program performs when run on multiple CPUs or with varying memory allocations. Emulators can also be useful in certain situations. When to Use Simulators Simulators are most commonly used in software testing scenarios when you want to make sure that an application works as intended when interacting with other apps or environments. You might wish to check whether an app can communicate data to other apps. A simulated environment will usually suffice because the underlying hardware configuration is unlikely to impact your application's data transfers significantly. Simulated testing environments are also useful to ensure that your application's interface shows correctly at various screen resolutions. Conclusion A simulator makes it quick and easy to build up a software environment for application testing without using real hardware. Emulators go one step farther by simulating both software and hardware combinations. When you need to test code quickly across a wide range of variants, both testing platforms are useful. However, neither is a complete replacement for real-device testing, which you should perform at essential periods, such as right before releasing software into production.

While a lot of databases have been created listing information in a table format, the web isn't set up in a tabular style. Neither is plenty of data in a variety of formats that the web uses. However, many databases are still using tables, because many web developers feel that tables handle plenty of data better than any other structure. Others feel that the data tables known as RDB should be converted to RDF, a format used to gather an even wider array of metadata across the worldwide web. The ability to convert to RDF will be extremely beneficial as technology advances to Artificial Intelligence AI and beyond. What is an RDB? RDB stands for a Relational Database. An RDB is a collective set of multiple data sets organized by tables, columns, or records. An RDB establishes a well-defined relationship between database tables. The tables communicate to share information that makes it possible to search for data, organize, and report. RDB is derived from the mathematical function concept of mapping data sets as developed by Edgar R. Codd. RDBs use Structured Query Language, SQL.SQL is a standard user application that provides an easy programming interface for database interaction. RDBs organize data with each table known as a relation which contains columns. Each table row, or record, contains a unique data instance defined for a corresponding column category. The data and record characteristics relate to at least one record to form functional dependencies. RDB performs "select", "project" and "join" database operations, where select is used for data retrieval, identifying data attributes, and combining relations. Those who prefer to use RDBs do so because of the advantages, including easy extensibility or scalability, new technology performance, and data security. What is RDF? RDF is primarily used to provide information or metadata for data available on the Internet. RDF provides the methodology for specifying, structuring, and transferring metadata, and provides the basic XML syntax for software applications to exchange or use that information. The URI/URL provides the location of that data. RDF stands for Resource Description Framework and is a standard for describing web resources and data interchange, developed and standardized by the World Wide Web Consortium, W3C with Xtensible Markup Language (XML) and Uniform Resource Identifier (URI) serving as its distribution standards. Typically, RDF provides basic information and attributes about an Internet-based object, such as the name of the author, Web page keywords, object creation or editing data, or the sitemap. While there are many conventional tools for dealing with data and more specifically for dealing with the relationships between data, RDF is the easiest, most expressive, and most powerful standard to date. The overall informational value is much greater because context or intent can be inferred. RDF presents small chunks of information in a form that infers meaning. This can include rules about how the data should be interpreted. Resource Description Framework, RDF, is the standard for encoding metadata and other structured information on the Semantic Web. Semanticization Data With all the semantic standards and database-centered HTML5 APIs and a W3C standard that calls for implementations, this is an exciting time for data on the web. It's time to embrace RDF with the capacity to start pulling relational data into the semantic web! The Purpose of RDBMS The software used to store, manage, query, and retrieve data stored in a relational database is called a Relational Database Management System, or RDBMS. The RDBMS provides an interface between users and applications with the database. It also provides administrative functions for managing data storage, performance, and access. Semanticization, or giving meaning to, all data can be done in two stages. First, construct a web of meanings, not documents -- as Sir Tim Berners-Lee has always wanted, and as the RDF, Resource Description Framework seeks to do. Second, fit all tabular data into the web whether legitimately or not. This second step is less exciting than the first because plenty of tabular data is not ideally tabular. In these cases, the second step is rather backward-looking. However, it is no less necessary than the first for two reasons: Converting everything RDBMS to RDF is not even close to worth it Much data ought not to be converted to RDF All of this data still needs to talk to the web, which means it needs to be translated into a webby structure, ideally RDF. The easiest way to translate without conversion is, of course, just plain mapping. But mapping two rather different structures to one another is no small undertaking or trivial task. That's why there's a whole W3C Working Group devoted to devising a mapping language and actual mapping of relational data to RDF. Sir Tim offers this insight into the RDF-RDBMS relation, cutting through questions that might otherwise be couched in domain-inappropriate terms (like 'is the RDF model an entity-relationship model'): Relational database systems manage RDF data, but in a specialized way. In a table, there are many records with the same set of properties. An individual cell (which corresponds to an RDF property) is not often thought of on its own. SQL queries can join tables and extract data from tables, and the result is generally a table. So, the practical use for which RDB software is used is typically optimized for doing operations with a small number of tables, some of which may have a large number of elements. Because relational databases are species of the genus described by RDF, the basic mapping model is as follows: a record is an RDF node; the field (column) name is RDF propertyType; and the record field (table cell) is a value. So far, so straightforward. Of course, the implementations usually wander pretty far from the original concept. That's why mapping actual RDBMS to RDF takes a bit of dirty work. RDB2RDF Enter RDB2RDF. The RDB2RDF WG is doing the dirty work. Back in 2005, when the Group was still an Incubator, they published a detailed survey of then-current approaches to mapping relational databases to RDF. This survey served as the starting point for typically extensive discussion and debate, which culminated in two Candidate Recommendations: The RDB to RDF mapping language: R2RML The Relational-to-RDF mapping itself Many techniques and tools have been proposed to enable the publication of relational data on the web in RDF. RDB-to-RDF methods are one of the keys to populating the web of data by unlocking the huge amount of data stored in relational databases. Since producing RDF data with sufficiently rich semantics is often important in order to make the data usable, interoperable and linkable, there are various strategies developed to enrich data semantics. Turning RDB to RDF has proven to be of value when dealing with SQL databases. It offers a straightforward and practical system for relational database conversion into RDF. RDB2RDF and the Future Moving forward beyond RDB-to-RDF methods, it will become necessary to find a compromise between the expressiveness of RDB to RDF mapping languages and the need for updating relational data using protocols of the semantic web. Creating, updating, and deleting RDF data should only be made possible in a secure, reliable, trustworthy, and scalable way.

Some of the major announcements from the W3C over the past week on making the web more accessible and powerful as a publishing platform.

Now you have even more ways to financially support your favorite open-source projects.

There are many settings that you can change within your smartphone to make it work better for you.

If you've used Kubernetes before, chances are you have come into contact with YAML files. Find out more about what they do here.

In 2018, the Realm Report predicted that Kotlin, a cross-platform programming language, would overtake Java by the end of the year. Was the forecast accurate?

It’s not that difficult to run multiple instances of a Windows Phone 7 emulator, or any other mobile emulator for that matter, when you’re doing testing, development, or having some DIY fun! You can run multiple instances of the Windows Phone 7 emulator by generating unique GUIDs for each instance that you need to run. You’ll also need to pass a VMID in order to get these multiple instances working. You can also run multiple instances of later versions of Windows phones like Windows Mobile 10. Ever since there were just rumors that Microsoft was going to make its own phone, we’ve wanted to run multiple instances of the Windows Phone emulator. For example, to test different command-line options in separate instances. By default, you cannot customize this behavior in Visual Studio 2010, that by now is the standard way to access the emulator. However, there is still an option provided by Microsoft that is not mentioned too often. The first thing you want to do is to be familiar with basic command line operations like how to launch applications from the command line and how to send specific parameters when executing an application—or script, for that matter. If you are familiar with these concepts, then you are good to go. If not, you should brush up on your command line basics. You’re also going to want to know how to configure emulators for Windows phones and Windows Mobile. The last thing you need to know is where the emulator and the default development WP7 OS image are located. On my system, I can find them in the following folders. WP7 OS Image: C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Emulation\Images WP7 Emulator: C:\Program Files (x86)\Microsoft XDE\1.0 If you try running XDE.exe from the emulator folder right away, you will be prompted with this message: Not exactly what we're looking for, but nonetheless it is helpful. So the emulator by itself won't start - I need to specify an OS image to be loaded. And here is when the console comes into play. Open the system console by pressing the Win+R keys and then typing CMD and clicking OK. Once the console is open, first of all copy and paste the path to the emulator, and then after a space, copy and paste the path to the OS image. The complete path string should look like this: "C:\Program Files (x86)\Microsoft XDE\1.0\XDE.exe" "C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Emulation\Images\WM70C1.en-US.bin" And once you run it... nothing happens. Besides the actual image, you need to pass a VMID - a GUID identificator that will be uniqued to the specified instance. NOTE: You can generate GUIDs quickly here. The VMID parameter is required to be unique for every given running instance. Otherwise, you will be getting an error message like this: Here is how you should pass the VMID to the emulator: "C:\Program Files (x86)\Microsoft XDE\1.0\XDE.exe" "C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Emulation\Images\WM70C1.en-US.bin" /VMID {3e7d1f17-dbf6-4e74-b1ef-20206c5fe7b9} Curly braces are required. Once you run this command, the emulator should do a full OS boot (no, the main applications will still be locked) and will get in the "Ready" mode in around 30 seconds. As long as you change the GUID, you can run as many instances as your machine allows you to. What is the Future of Windows Mobile? There are currently more questions about the end of Windows Mobile than there are answers. Microsoft has recently announced that Windows mobile 10 will be the last version of the software to receive any official support. This means that we're going to start to see applications no longer receiving updates, bugs going on fixed, and the continuing depreciation of the Windows mobile 10 software. We've already begun to see the beginning of the end for Windows mobile. The Xbox app on Windows mobile 10 no longer fully updates with the latest achievements and is already starting to show signs that it needs an upgrade. Windows mobile never had a strong position in the Apple and Android-dominated mobile market oh, so it was only a matter of time before Windows decided to close the door on this project. Is Windows 7 Still Supported? What About Windows 10? Windows 7 has been out for nearly a decade which means that there are few devices running this version of the Windows mobile software. Most modern Windows mobile devices are running the latest Windows mobile 10. Windows Mobile 10 is still officially supported, but Windows has announced that they will not be continuing development for the software. How Long do Windows Phones Have Left? Is very difficult to say how long Windows phones have left. Well, there is some speculation that the summer of 2022 is going to be something of the official end of Windows mobile, support for this platform really depends on how long developers want to stick with it. There would be nothing stopping developers from continuing making and updating their software for Windows mobile devices, but this does raise some important questions for developers looking to work in the space. What Does This Mean for Developing for Windows Mobile? Whether you're developing Java applications or you're looking to learn more about Windows mobile, you're in for an uphill battle when it comes to Windows 10 for phones. Developers are going to be hard-pressed to continue updating the software that they have on Windows mobile devices. This largely comes down to the fact that Windows has officially abandoned this project. This means that they won't be able to receive sufficient support for resolutions for core bugs within the mobile OS that could be creating problems for their own applications. At the end of the day, we can probably expect mobile application developers to continue releasing updates in the near future. However, we're going to increasingly see these developers shifting their focus to Apple and Android as Windows devices become less and less popular.

I really like Maven, and I really like the declarative build style, but recently I finally came to understand why Gradle is better.

When Apple finally released Java 6 for Mac OS 10.5.2, the Java community was more than a little upset. Java 6 only supports 64 Bit on Mac No Cocoa Support What to Do About Java 6 on Mac Using Java on Mac in 2022 What’s Changed Since Java 6 Where is Java on Mac Headed? The history of Java releases on Mac has been more than a little problematic. New updates for Java always find their way to Mac a few years too late and they are often more limited than their Linux and Windows counterparts. Let’s see how Java 6 on Mac stacked up and take a look at the latest Java release for mac and see how it compares. Java 6 on Mac Only Supports 64 Bit This means that Java 6 doesn't run on 1-year-old MacBooks or all early adopters of the Intel switch. A huge amount of people can't run 64-bit. Java 6 on Mac requires much more specific technology than Java 6 did on any of its counterparts. We tend to have a lot of opinions about how to code differently with Java, but we can all agree that Java 6 didn’t really work for Mac. Another problem is that it only supports 64-bit applications, Bye-bye applets in Safari. These are huge setbacks for people who were looking forward to Java on Mac, but the problems didn’t stop here. No Cocoa Support Because of the lack of 64-bit libraries for cocoa, it is not possible to use cocoa with Java 6. Nearly every Java application on Macs uses cocoa to make it look better on Mac OS. Some even are 100% cocoa, like Cyberduck. Because of that, only a small percentage of Java applications can run on Java 6. Java 6 really needed more Mac-specific support in order to function like it did on Windows or Linux. In fact, you have a better chance of performance tuning Java on Linux than you did on a Mac. Apple Knows This Apple is well aware of these problems. The update doesn't make Java 6 the default VM. Apple's preferences dialog even warns you if you want to make it the default VM. Having Apple and Java clash like this only made things more difficult for people working with Java on a Mac. So, What To Do Now? Options were limited for working with Java 6 on Mac. What made Java 6 on Mac even worse was the lack of any good workarounds or alternatives. You either had to commit to a limited system or try something a little involved. These are your options. We only have three choices from here: Switch back to Windows / Linux for Java development Use SoyLatte and help them to create the native GUI pipeline Ask Apple to fix these issues In the long term, no. 2 would be the best. A Java implementation by a large community would have faster release times. We can't wait for Apple to fix these issues—we have to do it ourselves. Getting Java 6 to turn on Mac requires some pretty advanced Java tutorials. Now, let’s take a look at what’s changed since Java 6. Using Java on Mac in 2022 In terms of running Java on Mac, so much has changed since Java 6. In fact, it would be just a few years until the release of Java 7 things completely changed for working with Java and working on an Apple computer. We're going to take a look at some of these specific changes and just see how the landscape of using Java on a Mac has changed from Java 6 all the way to Java 17. Using Java has only gotten more developed as the years have gone by. After all, becoming a Java developer starts with getting Java running on your Mac! What’s Changed Since Java 6 on Mac If you were trying to use Java on Mac since Java 6, you were up against a lot of trouble. You'd have to either settle for a Java that didn't perform nearly as well as it did online up to your PC or go through a bunch of complicated workarounds and still be stuck without all the features. What's important to keep in mind is that Java is more important today than it's ever been. While you might hear some people saying that Java is on the way out, Java still has plenty of use and pops up everything from popular applications, to websites, and it is a highly preferred language for programmers the world over. Java Becomes Mac Native All the DIY fixes in the world couldn't get us ahead for making Java work on Mac. However, things would have quickly changed with the release of Java 7. Starting with Java 7, Java releases work with Apple technology as long as the systems are compatible. You can run compatible editions of Java with your Mac laptop or computer. It all depends on whether or not the specs of your Mac match up with the edition of Java you want to run. Here’s where to start to find some familiar limitations for using Java on a Mac. There are Still Limitations (Java, Intel, and Mac) Even though Java runs on Mac after Java 7, there are still some problems with trying to get Java to run on Apple's technology. If you’re looking for the best toolkits, tips, and tricks for Java, you’re going to need to get it running first! Despite all the advances that are made, you're still going to encounter a few problems with trying to get Java to run on a Mac. The first thing that we have to talk about is that Java is designed to work with the Intel processor versions of Mac. Now that Mac is coming out with their own processor chips, we're seeing compatibility issues with Java and plenty of other technology that people rely on. Apple's desire to keep everything proprietary and stay in a closed sandbox is definitely costing them when it comes to reliably working with some of today's most popular technology. There are also issues when it comes to which Mac operating system you're using. There's a good chance that your Java version might not be compatible with the Mac computer that you're working with depending on the operating system that that Mac runs. Where Things Are Headed for Java on Mac There is good news for the future though. As Apple’s processor technology becomes more popular, more software is going to become compatible. Java is likely to follow suit with Adobe and plenty of others working to find ways to work with Mac’s M1 processors.

A customer recently brought to me a unique challenge. My customer wants information request form data to be collected in a database.

Introduction If you are using the Java Persistence API (JPA) 2.0, you may be wondering what the AccessType setting is for and how it can be used. This article will explain what the AccessType setting does and how it can be used to improve your JPA experience. The Java Persistence API program is a standard interface for accessing databases in Java applications. JPA 2.0, the latest version of JPA, introduces a new annotation called AccessType that allows you to specify how you want your entities to be accessed by the JPA provider. In this article, we'll take a look at why AccessType is relevant and how you can use it in your JPA applications. A Quick Look at Application It has long been debated whether field access is superior to property access for JPA entities. Most arguments that I've seen hinge on performance versus encapsulation. While these arguments may be interesting from a theoretical perspective, control over field access is in fact very useful in solving real-world problems. Field access allows code to distinguish between the JPA provider setting properties while loading an entity versus application code setting a property. This was very useful for a project that I'm involved with that has de-normalized data or other fields that are computed and persisted. Here's how it works: In the setter for various properties that affect the computation of a de-normalized property, the value of the de-normalized property is set to null. @AccessType(FIELD) is used for these properties. In the getter for the de-normalized property, if the value is null the de-normalized value is recomputed. In a @PrePersist method, the getter is called to ensure that the de-normalized value is properly persisted. Using this technique, maintaining de-normalized data becomes simple and robust. While this feature has been available within Hibernate since 3.0, I'm glad to see that JPA 2.0 (JSR 317) introduces a standard annotation to control this behavior. What is JPA 2.0? The Java Persistence API (JPA) is a specification for object-relational mapping in Java. It defines the way data is mapped to objects and vice versa. JPA 2.0 was released as part of Java EE 6 in 2009. JPA 2.0 was released in order to standardize the way that data is mapped to objects and vice versa. Additionally, JPA 2.0 introduced a new annotation called AccessType that allows you to specify how you want your entities to be accessed by the JPA provider. JPA 2.0 improves user experience by providing a standard annotation that allows developers to control how their entities are accessed. This annotation, AccessType, gives developers more flexibility and control over how their entities are accessed by the JPA provider. Additionally, JPA 2.0 standardizes the way that data is mapped to objects and vice versa, which improves the overall user experience. What are the key features of JPA 2.0? One of the key features of JPA 2.0 is the support for the AccessType annotation. This annotation can be used to specify how data is accessed and mapped to objects. There are two access types: - Field-level access: The data is accessed and mapped directly to fields in the object. - Property level access: The data is accessed and mapped indirectly through getter and setter methods. What is AccessType? The AccessType annotation specifies the access type for an entity. The access type can be either FIELD or PROPERTY. If you don't specify an access type, the default is FIELD. AccessType has the following attributes: - Value: This specifies the access type. It can be either FIELD or PROPERTY. - AccessType.FIELD: The data is accessed and mapped directly to fields in the object. - AccessType.PROPERTY: The data is accessed and mapped indirectly through getter and setter methods. The AccessType setting determines whether fields or properties of an entity are persisted. By default, all fields and properties of an entity are persisted. However, you can use the AccessType setting to specify which fields or properties should be persisted and which should not. This can be useful if you want to avoid persisting certain fields or properties that are not relevant to your application. What is the relevance of AccessType in JPA 2.0? The AccessType annotation is relevant in JPA 2.0 because it can be used to improve overall performance. By specifying the access type, the JPA provider can optimize how data is accessed and mapped to objects. In addition, the AccessType annotation can be used to reduce the amount of code that needs to be written. There are several reasons why AccessType is relevant in JPA 2.0: - It can be used to improve performance. - It can be used to reduce the amount of code that needs to be written. - It can be used to improve the maintainability of code. - It can be used to improve the readability of code. How to Use AccessType? To use the AccessType annotation, you first need to specify the access type for your entity. You can do this by using the @AccessType annotation on your entity class. For example, if you want to use property level access, you would specify the following: @AccessType(AccessType.PROPERTY) public class MyEntity {//...} Alternatively, you can specify the access type for an entity using the XML descriptor. For example, if you want to use field level access, you would specify the following in your persistence.xml file: MyEntity FIELD The AccessType annotation is used to specify the access type for an entity. The possible values for the AccessType enum are ACCESS, which represents class level access, and FIELD, which represents field level access. You can also use the XML descriptor to specify the access type. Class level access is the default access type, and it is used when no access type is specified. With class-level access, all persistent fields and properties of an entity are mapped to the database, regardless of whether they are annotated with the Column annotation. The only exception to this rule is when a field or property is annotated with the Transient annotation, in which case it is not mapped to the database. Field-level access is used when you want to specifically annotate which fields or properties of an entity are mapped to the database. With field-level access, only the fields or properties that are annotated with the Column annotation are mapped to the database. The other fields and properties of the entity are not mapped, and they will not be persisted in the database. Conclusion Overall, the AccessType annotation is a very useful addition to JPA 2.0. It can be used to improve performance, reduce the amount of code that needs to be written, and improve the maintainability and readability of code. If you're using JPA 2.0 in your applications, I encourage you to make use of this annotation. What do you think? Have you used the AccessType annotation in your JPA 2.0 applications? Share your thoughts and experiences in the comments below.

Sun released update 14 of the Java 6 JDK and JRE. As well as the usual collection of bug fixes, this release includes some experimental new features designed to improve the performance of the JVM (see the release notes). One of these is Escape Analysis. What Is Escape Analysis? Escape analysis is a compiler optimization technique that analyzes an object's access path to determine whether or not it is escaped from its current scope. If an object is not escaped, then the compiler can allocate it on the stack rather than on the heap. This eliminates the need for memory allocation and garbage collection for the object, which can improve performance. Allocating on Heap Vs the Stack To understand the implications of allocating an object on the stack or heap, it is first necessary to understand how these two data structures work. The heap is a pool of memory that is managed by the JVM. When an object is created, it is allocated a space on the heap. The size of this space depends on the object's type and the fields it contains. The stack is a data structure that is used to store local variables and function call information. When a function is called, its parameters and local variables are stored on the stack. When the function returns, these variables are popped off the stack. Allocating an object on the heap requires two operations: The object is allocated a space on the heap. The object's reference (a pointer to its location on the heap) is stored on the stack. Allocating an object on the stack requires only one operation: The object is allocated a space on the stack. Because allocating an object on the heap requires an extra operation, it is generally slower than allocating on the stack. In addition, heap allocation requires the JVM to manage the memory used by the object. This includes finding a free block of memory of the appropriate size and dealing with fragmentation. Stack allocation does not require any memory management, as the stack is managed by the operating system. What Is a Compiler? A compiler is a program that converts code written in one language (usually called the source language) into another language (usually called the target language). The target language can be either machine code or another high-level programming language. In Java 6 Update 14, escape analysis was turned off by default but could be enabled by passing the -XX:+DoEscapeAnalysis flag to the java command. However, now Escape analysis is supported and enabled by default in Java SE 6u23 and later. What Is An Object? In Java, an object is a self-contained unit of functionality that can be created and used independently. A typical object consists of both data and behavior. Data is represented by fields (also called member variables or instance variables), and behavior is represented by methods. You can think of an object as a "thing" that can perform certain actions and contains certain information. For example, a car is an object that can be driven (behavior) and has a color (data). Why Is Escape Analysis Important Today? Escape analysis is important because it can improve performance by eliminating the need for memory allocation and garbage collection for certain objects. When we say "garbage collection", that refers to the process of reclaiming memory that is no longer being used by the program. In general, garbage collection can be a CPU-intensive operation, so eliminating it can improve performance. Any time you can avoid allocating memory and/or doing garbage collection, your program will run faster. What Are Some Examples of Objects That Can Benefit from Escape Analysis? Small objects that are created and used within a single method can often benefit from escape analysis. For example, consider the following code: public static void main(String[] args) { String s = "Hello, world!"; System.out.println(s); } In this code, the String object created on line 3 is not escaped. It is created within the main method and is used only within that method. As a result, the String object can be allocated on the stack rather than on the heap. This eliminates the need for memory allocation and garbage collection for that object. How Does Escape Analysis Work? To determine whether or not an object is escaped, the compiler uses a flow-sensitive, interprocedural analysis. This means that the compiler not only analyzes the code within a single method but also looks at how the object is used in other methods that are called from the current method. If an object is only used within the scope of a single method and is never passed as an argument to another method, then it is not escaped. For example, consider the following code: public class MyClass { public static void main(String[] args) { MyClass obj = new MyClass(); obj.method1(); } public void method1() { int x = 5; method2(x); } public void method2(int y) { int z = y * 2; } } In this code, the MyClass object is created in the main method and passed as an argument to the method1 method. The method1 method then creates a local variable x and passes it as an argument to the method2 method. The MyClass object is therefore escaped because it is used in another method (method2) that is called from the current method (method1). In contrast, the local variable x is not escaped, because it is only used within the scope of the method1 method. When Should I Use Escape Analysis? Escape analysis can be used to improve the performance of any Java application. It helps to reduce the memory footprint. It is most effective when objects are short-lived and are only used within a single method. To see what kind of impact escape analysis might have on my applications, I decided to try it on a couple of my more CPU-intensive Java programs. Escape analysis is turned off by default since it is still experimental. It is enabled using the following command-line option: -XX:+DoEscapeAnalysis Benchmark 1 The first program I tested is a statistical simulation. Basically, it generates millions of random numbers (using Uncommons Maths naturally) and does a few calculations. VM Switches: -server 95 seconds VM Switches: -server -XX:+DoEscapeAnalysis 73 seconds Performance improvement using Escape Analysis: 23% Benchmark 2 The second program I tested is an implementation of non-negative matrix factorisation. VM Switches: -server 22.6 seconds VM Switches: -server -XX:+DoEscapeAnalysis 20.8 seconds Performance improvement using Escape Analysis: 8% In both cases, escape analysis gave a noticeable performance improvement. I was quite surprised by how much of an improvement I saw in the first benchmark. I wasn't expecting to see anything like that. Escape analysis is an important tool in the JVM performance tuner's armory and it's good to see that it is being improved and refined in each new release of the JDK. Are There Other Ways To Reduce Memory Footprint in Java? Yes, there are other ways to reduce the memory footprint in Java. One way is to use object pooling. Object pooling is a technique for reusing objects that have already been created. Another way is to use a generational garbage collector. A generational garbage collector is designed to collect short-lived objects more efficiently than long-lived objects. Finally, you can use a compacting garbage collector. A compacting garbage collector moves objects around in memory so that there are fewer gaps between objects. This can help to reduce memory fragmentation. Conclusions These benchmarks are neither representative nor comprehensive. Nevertheless, for certain types of programs, the addition of escape analysis appears to be another significant step forward in JVM performance. In conclusion, although escape analysis is still experimental, it is definitely worth experimenting with in your own applications. If you are interested in learning more about escape analysis, I highly recommend reading about it further on Dzone.

When moving around from page to page in your trusty browser, you get the benefit of hovering over links and viewing the link's target URL in the status bar. When it comes to page printouts, however, this obviously isn't an option. Most website printouts simply show the link as text with an underline. What good is that? Links Should be Printable One of the key elements that many people forget about when they are creating a web page of any kind is the fact that they should be making the links that are inserted printable. You see, there are many people who will want to check out the information and research that you are providing them via the links inserted into your page. Unfortunately, they may not be able to look at those links as completely as they might want to if you are not making it easy and possible for them to print off the links. Making links printable is a matter of getting into the CSS code and looking to make sure that any URLs that you have inserted are truly printable for your audience. It is fully expected that you will take the time to do this for the people who have bothered to show up and read your materials. Truthfully, you owe them a sign of your appreciation for having come to see what you are creating in the first place. Internet Explorer Often Ignores the Code One thing to keep in mind when you begin to mess around with the CSS codes for your URLs is that it is entirely possible that Internet Explorer will ignore the codes that you put in there if you don't get them just right. Internet Explorer is set up in such a way that it will ignore certain lines of code and other materials that people insert into their websites if Internet Explorer feels that the code is not relevant. This is why you must be on top of everything to make sure Internet Explorer does force your code out when you know for a fact that the code that you are using is incredibly important to the usefulness of your website. To provide extra help to your content viewers, you may want to include a snippet of information that lets them know that Internet Explorer may cause some problems when they are trying to print off links in the article. A quick line or two that encourages them to use a different Internet portal such as Firefox or Google Chrome may prove beneficial to all of your readers. They need access to your information, but they may struggle to get it if they are only using Internet Explorer. Sadly, they may not even realize that this is a problem unless you point it out by making it clear that they need to switch browsers in order to print off the information that they require. Take some time to throw in a quick line about why users need to shift over to using a browser other than Internet Explorer to get the information that they require. If you do this, then they will be able to finally get the information you are providing without getting jammed up simply because of the browser they are using. One simple line and you can help fix so many of the problems that they are facing. Providing URLs for links in the print version of your page can be extremely helpful to the reader. Using a small snippet of CSS code, you can get printouts to display link URLs right next to the link text. The CSS Code a:link:after, a:visited:after { content:" [" attr(href) "] "; } The pitfall of this method of displaying links URLs for print is that Internet Explorer ignores this code. If showing link URLs is critical, I'd recommend using a javascript alternative. If not, add this snippet to your print stylesheet to make your page print-outs more informative. Click here for an example! JavaScript Alternatives Can Help There are situations in which JavaScript alternatives can help you get around the auto-blockers that Internet Explorer has put up on some of these codes. You may need to work around the traditional system in order to get the results that you need, but you should have a lot of success getting the code to look just the way you need it to if you use some alternative programs to achieve your results. Sometimes, you just have to think outside of the box like this to get around the barriers that sadly exist within the computing space. We can all hope for a day when there aren't so many layers of protectionism between ourselves and the things that we want to put up on the Internet. If we can just use some of the tools at our disposal as far as JavaScript alternatives and the like are concerned, then we may be able to make some progress in the right direction. It is a challenge to be sure, but there are a lot of ways that we might be able to build a better Internet and a better world in general. Does Printing Still Matter for Links? There are different schools of thought about how important the ability to print something off still is to people, but most land on the assumption that it is better to have printing abilities than to not have them. People sometimes want to print something off so they can view it on their own time and even hand the printed copy off to someone else that they know that they believe might benefit from it as well. Why would you want to deny them the ability to do this? The CSS code that is used on your links will be extremely important to the final ability of someone else to use it to print off what they see on the screen. This is why you should be extra careful to make sure the code is written just right. There are situations in which your viewers may delight in the information that you provide them, but they may not have Internet access everywhere that they go. If they need to pull up your information without access to the Internet, then it is necessary for them to print off the files that they need from you. Thus, you might want to spend some time getting your links into a form that allows them to be printable. Not everyone who visits your website will care about printing something off, but the people that do care about it will notice the steps you took to make this possible for them, and they will surely appreciate what you have done for them.

Putting Together the Best of Both Worlds One of the things that people like so much about JavaFx is the fact that it has a suite of powerful tools used by designers and creators to get exactly the kind of look and feel that they desire from their creations. When used properly, JavaFX will change the way that you take care of your biggest technology challenges. That is why it is such a powerful product to use, and that is also why people around the world recommend it for the value that it can add to your work. A few of the features that are included are: WebView Java APIs High-Performance Media Engine Multitouch Support Canvas API These are just a few of the things that JavaFx has going for it. Truly, it is a powerful engine that people use to help make sure their media creations are something that people will stand up for and take note of. The truth is, no matter who you are or what your intentions are for the use of Java in your life, the JavaFX combined with Java itself is the way to go. while experimenting with javafx, remember that java is never far away. in this case, let's call out to : here we go, here's all that's needed, via the scripting api, which is included in the javafx sdk: package calc; import java.io.inputstreamreader; import javax.script.scriptengine; import javax.script.scriptenginemanager; import javax.script.scriptexception; public class calculatorlauncher { public static void main(string[] args) { try { scriptenginemanager manager = new scriptenginemanager(); scriptengine engine = manager.getenginebyextension("fx"); inputstreamreader reader = new inputstreamreader(calculatorlauncher.class.getresourceasstream("calculator.fx")); engine.eval(reader); } catch (scriptexception ex) { } } } and so, here's my whole application, calling jim weaver's calculator demo: What is even better would be to be able to embed that JavaFX stage (or a panel-like part thereof?) into a JFrame. then one would have the best of both worlds: the graphic "oomph" of JavaFX, together with the daily low-level grunt work of java. that, I believe (and hope), is the promise of JavaFX for java developers (and groovy developers), as opposed to designers and similar graphic artists, who seem to be the primary target of JavaFX. Day-to-Day Grind Work One thing that people absolutely love about Java itself is that it allows them to get the day-to-day grunt work done that they need to be done. They are able to see real progress on a daily basis simply by using Java to help propel their best efforts into the world. Yes, there are not as many bells and whistles with Java as there are with JavaFx and other tools, but that just means that there is more to combine with Java to get it to do all that you want it to do. Using JavaFX and Java together can help get more done. This is an innovative approach because it means that they are able to use the bells and whistles of JavaFx incorporated into the practicality of Java itself. Bringing those two things together is a great way for everyday people to achieve results in their work that they would not normally have believed was possible. We do need to recognize the fact that there are many great resources that Java can be used for, but it is also the case that JavaFx simply gives it the extra push that it needs to be a great computing program all around. We would be remiss if we didn’t combine the two things together for optimal use. Does JavaFX Makes Sense For Business Applications? There is still a lot of debate about how much sense it makes to use JavaFX for business applications. On the one hand, there are a lot of people who prefer this as their technology of choice. However, there are some others that say that it is too buggy and can’t handle all of the data that is required for a business operation to run smoothly. What people really like about JavaFx is the fact that it can be used on a “zero installation” basis. This means that it doesn’t need to dig deep into your databases and systems in order to function the way that it is supposed to. That is a pretty big deal because you may find it quite irritating to try to deal with systems that constantly request permissions from you to get deeper and deeper into sensitive data. JavaFX doesn’t do that. However, there is a trade-off. The fact that JavaFX doesn’t need to be as deep into your company’s systems also means that it doesn’t necessarily have the computing power that you may require to fun every operation that you need it to. That means that there could be unnecessary crashes and delays when you attempt to use this system as a standalone program. Does Combining It With Java Help? Some of the issues that are seen with JavaFx may be relieved by the fact that you can also use plain old Java to help make things run a little more smoothly. That’s right, you can combine the Java platform that you are already familiar with to let it latch on to the JavaFx system and generate results that way. You may see fewer system errors and hang-ups when you use this older piece of software to aid the JavaFx system. Regular Java does require more permissions to your data, but that may be a trade-off that you are willing to make if you understand that the upsides are potentially quite enormous for you. Think about your options carefully and then make a decision. Unless you are guarding particularly sensitive data at your company, it probably makes sense to go forward with the plan to get JavaFx and Java combined into the rotation of programs that you use. Innovation Is At Your Fingertips There is plenty of excitement and buzz about the possibilities that JavaFx can bring to the world of business. People are looking at it and starting to realize that there are many ways that it may be used as an innovation machine. They are particularly excited that there are more options than ever available to them and that they can see the ways in which this system may be used to generate outsized business opportunities both for the company that they work for as well as for themselves. If you haven’t had the chance to try the JavaFx system for yourself yet, you need to give it a shot. There are a lot of people who are already benefiting from what it has to offer, and you may fall behind if you don’t try it out as well. Look at what it can do when you get the chance, and then get one for yourself and begin the process of innovation. You won’t regret taking this opportunity to expand your horizons.

Bringing Together Various Components There are situations in which it may be to the benefit of a programmer or other computer user to look at bringing together native components of a system with swing components. These are components that they have either created on their own accord or components that they have brought over from another service. Either way, combining the native components that already exist in a system with swing components is a great way to achieve some surprising results. You might want to think about giving this a try if you are thinking about how you can bring your talents up to date for use in the world as it is today. DJ Native Swing is a nice solution to embed native components (Web Browser, Flash Player, etc.). There was still a general issue that this library did not resolve though: the possibility to mix heavyweight and lightweight components with lightweight components on top, to change their Z-order or re-parent them. Fortunately, The release 0.9.3 offers interesting advances in this area. Using these features is as simple as changing some options before instantiating native components, in order to extend their behavior. You can try all the features (including the new options) with the Webstart Demo: http://djproject.sourceforge.net/ns/DJNativeSwingDemo.jnlp The Webstart demo is configured to work on Windows. It also works on Linux (GTK, x86/i386) where XULRunner is installed. Note that this demo is part of the release package. Run Tests on Every Component It is a good idea to run a demo of any components that you think you might want to put together. The reason for this is that you need to make sure those components will work for you as you anticipate that they will. This is far from a guarantee, and that is why you are called upon to pay careful attention to the things that you are running through these systems. It is entirely possible that you might find some errors that you made along the way when you are checking out the system to see where you went wrong. There is nothing bad about looking over something and realizing that you still have some room to grow and figure things out. As a matter of fact, this is a great way to grow as a person and as a programmer. You cannot begin to take steps in the right direction if you don't figure out where you can improve upon the decisions that you have made before. In my opinion, this gets us one step closer to proper native integration. What do you think? Have you got any comments or suggestions? Mixing Things Up for a New Creation Believe it or not, one of the best things that you can do to mix things up and keep your creations fresh is to look at how you can combine native components with the swing components that you bring into the system. It is a way for you to show the people who will ultimately use your creations that you are serious about making something that they stand to benefit from. If that is the kind of thing that you are into, then you need to give it a try right now. After all, there may be a tremendous number of people just waiting to see what you are all about and what you can offer to them. If you provide them with things to get excited about, then they will keep coming back for more. -Christopher

You've come to the right spot if you are trying to hack OpenJDK with NetBeans IDE. This article explains what OpenJDK with NetBeans is and how you can use NetBeans to create OpenJDK. But before we dive in, first things first: What are Hack OpenJDK and NetBeans IDE? Open Java Development Kit (JDK) is an open-source implementation of the Java Platform or Standard Edition. That means anyone can access the source code and GNU General Public license of the OpenJDK. You may also ask, "then what is Netbeans?" NetBeans is also an open-source integrated development environment for developing with Java, PHP, C++, and other programming languages. All THE applications are developed modules in Java. The OpenJDK repository contains a NetBeans project for all C/C++ parts of the OpenJDK, including Hotspot. So, since NetBeans is an Apache project, it is pretty easy to download and hack the code. You can run it on operating systems like Windows, Linux, and macOS. Remember, to use NetBeans for Java programming; you first need to install Java Development Kit (JDK). Can I use NetBeans with OpenJDK? Yes, you can. The latest NetBeans version of NetBeans is at NetBeans IDE 6.0 Beta 1. But keep this in mind, to hack OpenJDK, you'll need only the Java SE version. Which JDK is compatible with NetBeans? The JDK is compatible with JDK 8 features. That includes annotations, compact profiles, lambda expressions, and repeatable. When you use any of those constructs in your code, they will automatically highlight errors and allow you to fix syntax. Review, Hacking, and Develop OpenJDK. You follow these simple: Get OpenJDK, as follows: #hg clone http://hg.openjdk.java.net/jdk8/build jdk_trunk #cd jdk_trunk #sh get_source.sh #mkdir build #cd build #sh ../configure. After you’ve "configured", the step is complete, remember the value assigned to "Boot JDK" and then:#export IDE_ALT_BOOTDIR=jdk_path_found_by_configure #netbeansStart NetBeans IDE (with C++ support) and open projects from "common/nb_native". Just make sure that the project already contains configurations for Solaris, Linux, and macOS. You can do this by switching to the appropriate configuration and enjoying hacking OpenJDK. Next up, navigate inside your NetBeans project directory. Once there, you will find a directory called incubator-Netbeans. This directory contains sufficient NetBeans modules. Is OpenJDK with NetBeans IDE secure? As the emphasis increases, so does the need for security. Hence, you can easily create the Secure Directories. You can do this by choosing File > New Project (Ctrl-Shift-N), selecting Web Application from the Java Web category, and clicking Next. Regression testing verifies that system changes do not interfere with existing features or code structure. They are part of almost every test suite in software development lifecycles. It is common for developers to change or add a code section and unintentionally disrupt something that is working just fine. Visual regression testing functions on the same logic but confines it to the visual aspects of the software. It works by comparing two images and automating complicated scenarios, like when we cannot identify the elements in the DOM tree. However, visual regression can be used on any website. How Does Visual Regression Testing Work? During the first run, the visual comparison tool captures the snapshot called the base image. The subsequent run compares the base image if there is no difference test is passed, and if there is a difference, the test is considered as failed. Visual regression is also called visual comparison testing. In this tutorial, we will discuss automated visual regression using Playwright. Prerequisites for Visual Regression with Playwright Download and install NodeJS Download and install Visual Studio Code (Recommended) Install Playwright NPM module Install @playwright/test module Note Throughout this tutorial, we are using Playwright with JavaScript. Playwright comes with the default visual comparison tool, so there is no need to install additional packages. Create Simple Visual Comparison Tests Using Playwright In your tests folder, create a new JavaScript file example demo.spec.jspage.screenshot() function takes the screenshot, and expect in the @playwright/test module provides the assertion for matching the images that are .toMatchSnapshot(). Inside the newly created JavaScript file, create a new test that performs the visual comparison like below. Visual Comparison in Playwright to Ignore Minor Differences The above comparison technique matches the screenshot pixel by pixel, which means each pixel should match exactly. This behavior can be modified by passing the argument maxDiffPixels = . Example JavaScript const { test, expect } = require('@playwright/test'); test('Visual Comparison Test Demo', async ({ page }) => { await page.goto('https://playwright.dev'); expect(await page.screenshot()).toMatchSnapshot({ maxDiffPixels: 200 }); }); In the above example, we have specified the maxDiffPixels value as 200, which means the maximum pixel difference can be 200. Image Comparison in Playwright With Threshold Option Playwright toMatchSnapshot() accepts threshold, threshold ranges from 0 to 1, default value is 0.2. The threshold is tolerance of image differences. Example Code JavaScript const { test, expect } = require('@playwright/test'); test('Visual Comparison Test Demo', async ({ page }) => { await page.goto('https://playwright.dev'); expect(await page.screenshot()).toMatchSnapshot({threshold:0.5}); }); In the above code, the threshold is mentioned as 0.5. Playwright Visual Comparison Tips and Tricks In Playwright, we can pass the image file name; instead of default comparison, Playwright compares with the specified filename. Example expect(await page.screenshot()).toMatchSnapshot('home.png'); Playwright also allows us to compare element snapshots; we can take a snapshot of DOM elements and compare. Example expect(await page.locator('xpath=//*[@id="__docusaurus']).screenshot()).toMatchSnapshot(); Visual Regression With Playwright Using Percy Percy is a web-based tool for visual testing with a free tier, and it provides both manual and automation capability for visual comparison. Percy supports Playwright integration. Percy is now a part of Browserstack. If you already have a BrowserStack account, you can sign in with BrowserStack or sign up and create one. Using Percy With Playwright Step 1 – Install Percy modules using the following command. npm install --save-dev @percy/cli @percy/playwright Step 2 – Create a new JavaScript Playwright test file like below. JavaScript //demo.spec.ts const { chromium } = require('playwright'); const percySnapshot = require('@percy/playwright'); (async () => { const browser = await chromium.launch(); const page = await browser.newPage(); await page.goto('https://www.browserstack.com/', { waitUntil: 'networkidle' }); await percySnapshot(page, 'Example Site'); await browser.close(); })(); In the above example, we are navigating to https://www.browserstack.com/, and we are taking a snapshot using the percySnapshot() function. Setting Up Percy Step 1 – Login to Percy. If you don’t have an account, create one. Step 2 – Create a new project. Step 3 – Copy Percy token. Step 4 – In your Visual Studio Code Terminal, set the PERCY_TOKEN environment variable using the below commands: Powershell / Visual Studio Code Terminal $env:PERCY_TOKEN = "your_token"

Child controls on Windows Smartphone 7 are a big deal to a lot of people. The amount of data, information, and even adult materials that a child could have access to if on an unsecured phone is beyond what most parents are willing to risk. The Silverlight application makes it easier to view a complete list of the various child controls that one may decide to add to their Windows phone to keep it safe. After all, you never know when your child may get their hands on your phone and see things that you don't want them to have access to. ListBox Allows Me to Display Child Controls Usually, I am using ListBox control in my Windows Phone 7 Silverlight applications to display a scrollable list of child controls. ListBox offers UI virtualization, which means that UI is loading ListBox items on demand to increase the performance and reduce memory allocation. One of the main keys to that is in using VirtualizingStackPanel as ItemsPanel Template for ListBox control. Lately in one of my Windows Phone 7 projects I had to replace ListBox with ItemsControl, but ItemsControl does not offer UI virtualization for child items by default, so I had to add the same VirtualizingStackPanel to ItemsPanelTemplate element. Also I have modified the Template element to be able to add and access ScrollViewer for ItemsControl. View Everything in One Space VirtualizingStackPanel makes it easier to see everything on one screen so you can rest assured that nothing is slipping through the cracks. You don't want to leave any open security holes on your phone that your child may figure out a way to exploit. Unfortunately, many children are quite good at getting around security features that you have set up for them, and that is why you need to use VirtualizingStackPanel to review everything on your phone and make sure it is locked down. Now, you need to understand that this feature is not only useful for creating child security locks on your phone, but for many other purposes as well. You might want to breeze through and review other settings on your phone to ensure that you have it all set up optimally. After all, you don't want to waste time dealing with a phone that is not set up in the best way possible. What Type of Child Controls Are Available Via ListBox for Windows 7 Phones? Concerned parents everywhere will ask themselves what kind of controls they can expect to have over their Windows 7 phone when setting it up for their children to use. On the one hand, they know that their children will want to use their phones, and they don’t want to deny them the ability to delight in the technology that so many of the rest of us also enjoy every day. On the other hand, they are concerned parents who worry about what kind of things their children could be exposed to. The Windows 7 phone has numerous options that allow a parent to filter out things that they don’t necessarily want their children to see. A few of the popular controls that parents often set up for their children include: A block on inappropriate/adult websites A block on online gaming websites A timer that limits how long the child may use the phone These are all key features of the Windows 7 parental controls that are worth paying attention to. The reason is that children may be exposed to more from the outside world than you ever intended. Not only could they see inappropriate content, but they could get hooked on some of the online games that exist today. Those games are meant to be highly addictive by nature so that people will continue playing. However, this also poses a risk to children who may get exposed to too many stimuli from these games too early in their life. If that happens, then it may not be easy to peel away from those games. You certainly don’t want to take a risk like that with your child, and that is why you need to put a limit on the amount of time that they are able to view your screen on your phone. They need to take some time away from those screens in order to develop as people, and it is a lot better to use a program that will automatically cut them off from the online games that just want them to keep playing. How Do You Get Around Child Locks for Yourself? The other thing to keep in mind when using the software programs that are available to you for creating child locks on your phone is that you will need to circumvent those locks for yourself. You will still want access to the websites that you want to go to when your child doesn’t have your phone. Thus, you should make sure you are well-versed in how the Silverlight application works before you go to install it on your phone. Many people jump the gun too fast and try to get a program like this on their phone because they are so worried about their children being on the Internet and what it could mean for their safety. It is noble that people want to keep their children safe, but it is also responsible to want to make sure your phone is protected from the possibility of not having access to the full Internet that you may require at some point. You can, and should, install a backup password that you can use to get around any and all child locks that you put in place. Doing so will put you in the best position to get around the child lock and temporarily disable it while you use your phone as you normally would. The only thing to keep in mind is that you will need to put the child locks back on your phone once you are done using it and before you give it to your child. Once the locks are disabled, they won’t go back up unless you instruct them to do so via your phone. Many people have used child locks to keep their children from being exposed to material that they don’t want them to see too early in life. You may feel the same way, and it may be time for you to take direct action to ensure that your children are subjected to material that you wholeheartedly disagree with them seeing.

Let's explore distributed tracing for microservices on the ELK stack.