Java Resources

How To Add, Remove, or Rotate Pages in a PDF Document Using Java

Learn API solutions to add pages from one PDF to another, remove pages from a PDF, rotate all pages within a PDF, and rotate a subset of pages within a PDF.

September 6, 2022

by Brian O'Neill

CORE

· 6,759 Views · 3 Likes

Preventing SQL Injections in Java With JPA and Hibernate

Preventing SQL Injections in Java using SQL Parameters with the Java Persistence API (JPA) and Hibernate ORM.

September 6, 2022

by Elmar Dott

· 7,334 Views · 4 Likes

Error Handling via Dead Letter Queue in Apache Kafka

Dead Letter Queue for error handling in Apache Kafka: Alternatives, best practices, and case studies from Uber and Crowdstrike.

September 3, 2022

by Kai Wähner

CORE

· 8,493 Views · 7 Likes

Which Is the Best OS To Use To Develop a Java Application?

One subject that often evokes a lot of debate is which is the best OS to use to develop a Java application. This article gives one view on the issue.

September 2, 2022

by Rob Austin

· 12,737 Views · 19 Likes

Java String intern(): Interesting Q and A

The intern() function eliminates duplicate string objects from the application and has the potential to reduce the overall application memory consumption.

August 30, 2022

by Ram Lakshmanan

CORE

· 7,810 Views · 1 Like

OpenTelemetry: A Quarkus Superheroes Demo of Observability

This demo illustrates how to capture telemetry data with OpenTelemetry between distributed services and view interactions between microservices in a system.

August 27, 2022

by Eric Deandrea

· 7,448 Views · 3 Likes

Serverless Is the New Timeshare

Remember mainframes? Serverless is pretty much that: we own the machine and you rent out time on our big iron. We went full circle on progress!

August 27, 2022

by Shai Almog

CORE

· 6,709 Views · 8 Likes

Hibernate and JPA Tutorial: Crash Course [Video]

Ever looked for a comprehensive tutorial to Hibernate and JPA that is fun and entertaining at the same time? Look no further than this video tutorial.

August 26, 2022

by Marco Behler

· 7,432 Views · 2 Likes

Java Bytecode Simplified: Journey to the Wonderland (Part 2)

As we continue the journey into Java bytecode, here, in part two of the series, delve a bit deeper into ConstantPool.

August 25, 2022

by A N M Bazlur Rahman

CORE

· 8,219 Views · 2 Likes

Java Bytecode Simplified: Journey to the Wonderland (Part 1)

Interestingly, we don’t even need the whole set of bytecode in Java. Today we use around 205. These are called operation codes or simply "opcodes."

Updated August 25, 2022

by A N M Bazlur Rahman

CORE

· 13,782 Views · 16 Likes

How to Convert a PDF to Text (TXT) Using Java

This article outlines the difficulties in extracting plain text from regular PDF documents at scale and demonstrates two API solutions that efficiently perform that task.

August 21, 2022

by Brian O'Neill

CORE

· 9,973 Views · 2 Likes

Spring Data JPA Interview Questions and Answers

One of the most popular starters in Spring Boot applications is Spring Data JPA. Hence, you have nearly no chance to avoid JPA-related questions during a job interview. Let's take a look at the most frequently asked questions with detailed answers.

August 20, 2022

by Georgii Vlasov

· 10,851 Views · 6 Likes

How To Connect a Heroku Java App to a Cloud-Native Database

In this post, continue the journey to create a geo-distributed messenger in Java by looking at several connectivity options for Heroku and YugabyteDB Managed.

August 19, 2022

by Denis Magda

CORE

· 6,534 Views · 4 Likes

Troubleshooting Microservices OutOfMemoryError: Metaspace

Confronted with an interesting java.lang.OutOfMemoryError: Metaspace problem in a microservice application? Learn the steps taken to troubleshoot the problem.

August 19, 2022

by Ram Lakshmanan

CORE

· 6,756 Views · 1 Like

PHP Over Java? Or Is It Java Over PHP?

Looking at the popularity, PHP has been used by 81.25 percent of the tech companies worldwide just to build their web applications.

Updated August 18, 2022

by Jasmine Ronald

· 7,893 Views · 5 Likes

Open-Source SPL Helps Java Handle Files of Open Formats: TXT, CSV, JSON, XML, and XLS

SPL (JVM-based programming language) can parse structured data files of regular-or irregular-format, represent 2D/hierarchical data in a uniform way, and more.

August 18, 2022

by Jerry Zhang

· 4,857 Views · 1 Like

Modern Strategy Pattern in Functional Java

This article shows how to use a strategy pattern with a pinch of enums and functional syntactic sugar in functional Java.

Updated August 17, 2022

by Jakub JRZ

· 4,920 Views · 6 Likes

Step by Step Guide to Create Mule Custom Connector Using Java SDK

This tutorial guides you to create a custom connector for Mule 4 which includes both Source and Operation components.

Updated August 17, 2022

by Jitendra Rawat

· 4,423 Views · 2 Likes

Top 10 Java Language Features

Let's explore ten Java programming features used frequently by developers in their day-to-day programming jobs.

August 15, 2022

by A N M Bazlur Rahman

CORE

· 9,373 Views · 14 Likes

On Cosmetics vs. Intrinsics in Programming

Code has cosmetic and intrinsic characteristics. See examples demonstrating how to achieve the same intrinsic with different cosmetics and vice versa.

August 15, 2022

by Nicolas Fränkel

· 4,145 Views · 2 Likes

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