Java Resources

Template-Based PDF Document Generation in Java

Explore this guide to integrating eDocGen with your Java-based applications to generate PDF documents from JSON/XML/Database.

September 25, 2022

by Venkatesh Rajendran

· 20,965 Views · 4 Likes

Bungee-Jumping into Quarkus: Blindfolded but Happy

A year ago, I started a new project using Quarkus. Here are some of the challenges I found using this new Java framework.

September 24, 2022

by María Arias de Reyna

· 6,005 Views · 2 Likes

The Problem With Annotation Processors

The problem lies squarely with the unavailability of the environment outside the compiler. Without its environment, testing an annotation processor is a lost cause.

Updated September 22, 2022

by Matthias Ngeo

· 11,026 Views · 3 Likes

Painless WebSocket Tests With Spock Framework

Testing asynchronous code is never easy. Still, simplicity and maintainability is possible with the right set of tools.

Updated September 21, 2022

by Jakub JRZ

· 5,285 Views · 1 Like

The 5 Most Pivotal and Innovative Additions to OpenJDK 19

OpenJDK 19 is a significant release that includes several game-changing features that will alter the Java landscape. Let's break down the five most intriguing.

September 21, 2022

by A N M Bazlur Rahman

CORE

· 8,072 Views · 5 Likes

Java Observer Pattern With Spring AOP and a Custom Annotation

How to use a specific implementation of the Java Observer Pattern to inject new functionalities into an existing system based on Spring.

September 21, 2022

by Mario Casari

· 5,312 Views · 2 Likes

Inheritance vs Composition in JPA

@MappedSuperclass is used almost in each #JPA application to declare common fields. It could also be achieved using @Embedded entities. Read this article to learn more.

Updated September 20, 2022

by Georgii Vlasov

· 10,118 Views · 11 Likes

Develop a Simple App: React, GraphQL, Spring Data JPA, UCP, and Oracle

Develop a simple app in minutes with a React frontend that makes GraphQL calls against a Spring Boot Data JPA service backed by Oracle database and accessed via UCP.

September 20, 2022

by Paul Parkinson

· 9,011 Views · 2 Likes

How To Build a Command-Line Text Editor With Java (Part 2)

Want to know how text editors implement cursor movements and scrolling? Learn how in this video tutorial.

September 20, 2022

by Marco Behler

· 5,919 Views · 2 Likes

Java String Intern: Performance Impact

java.lang.String#intern() is an interesting function in Java. In this post, let’s discuss the performance impact of using this function in your application.

September 19, 2022

by Ram Lakshmanan

CORE

· 7,699 Views · 2 Likes

Tracking Aircraft in Real-Time With Apache Pulsar and Apache Flink

Ingest, enrich, parse, transform, route and query live plane data with open source.

September 19, 2022

by Timothy Spann

· 4,366 Views · 2 Likes

Chaos Engineering: Metaspace OutOfMemoryError

Here, simulate an encounter with ‘java.lang.OutOfMemoryError: Metaspace,’ which indicates that the Metaspace region in the JVM memory is getting saturated.

September 15, 2022

by Ram Lakshmanan

CORE

· 6,782 Views · 1 Like

Building Cloud Native Apps With Spring

Here’s how powerful Spring Boot, Spring IO, Spring Data, and several Netflix OSS projects can be when used together to build microservices.

Updated September 15, 2022

by Ryan Baxter

· 17,354 Views · 13 Likes

Are You Crazy Still Using JSF?

Java-Server-Faces is a web technology that is underestimated by many people. Why is that? And are you actually crazy if you still use JSF?

September 15, 2022

by Ralph Soika

· 6,160 Views · 9 Likes

Acceptance Tests in Java With JGiven

In these example scenarios, learn more about acceptance tests in Java, and why you should learn them right now.

Updated September 13, 2022

by Elmar Dott

· 15,459 Views · 5 Likes

How To Build a Command-Line Text Editor With Java (Part 1)

Want to know how text editors work, how shell scripts change terminal text colors, update lines without scrolling, or move the cursor around? Here, learn how.

September 9, 2022

by Marco Behler

· 16,087 Views · 3 Likes

In Which Region Are Intern Strings Stored?

Learn more on which region Intern strings are stored in.

September 6, 2022

by Ram Lakshmanan

CORE

· 5,929 Views · 3 Likes

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

· 7,008 Views · 3 Likes