Java Resources

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

· 8,916 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

· 5,775 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

· 7,556 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

· 4,268 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

· 6,722 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

· 17,232 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

· 6,075 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

· 15,224 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

· 15,721 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

· 5,803 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

· 6,812 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

· 7,357 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

· 8,513 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

· 12,775 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

· 7,850 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

· 7,464 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

· 6,739 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

· 7,468 Views · 2 Likes