Learn about the Spliterator interface that can be used for traversing and partitioning sequences.

Learn how to return another Optional instance if the first one is empty.

Review what compilation errors are, and then specifically explain what the "cannot find symbol" error is and how it's caused.

Learn how to create a dynamic URL in Retrofit2

Learn how to convert a Map to a String and the other way around using both core Java methods and third-party libraries.

How to do Base64 encoding and decoding in Java, using the new APIs introduced in Java 8 as well as Apache Commons.

A guide to understanding Java Instrumentation and implementing custom agents.

A short article about Maven Wrapper - what problem it solves, how to set it up, and how it works

Akka is a free, open-source toolkit and runtime for building highly concurrent, distributed, and resilient message-driven applications on the JVM. Along

We've been hearing all about it.  Jakarta EE 9 will be released in November 2020.  The Jakarta EE working group and community have been working hard to

This article describes how you can use JShell to download and execute a Java application. It will eliminate the need for the installation of the

While developing a spring boot application, sometimes we need to run a method or a piece of code at startup. This code can be anything ranging from,

Learn how to parse command-line parameters with Airline

Learn how to process lines in a large file efficiently with Java - no need to store everything in memory.

Learn about the @SafeVarargs annotation in Java

We have created a new quickstart that extends OptaPlanner use case portfolio with the facility location problem and also demonstrates building a

Revisiting project Jigsaw and first-level cache in Hibernate, a little competition for SDKMAN!, moving data at petabyte scale, and fallacies about time and timezones!

Learn about the differences between ClassNotFoundException and NoClassDefFoundError.

Learn the differences between Java's checked and unchecked exception with some examples

How to Convert between an Array and a List Using plain Java, Guava or Apache Commons Collections.