The format of code is something all developers have an opinion on! With IntelliJ IDEA, a team can define their standards and have the IDE apply them automatically, so developers don't have to think about formatting their code as they work. (more…)

JetBrains loves all programming languages, and developers of all types! This May, Java turns 25 years old! So we want to pay it special attention, and celebrate 25 things we love about Java and the JVM. (more…)

Most readers of the IntelliJ IDEA blog are long past writing "Hello World" applications, but there are plenty of people who haven't yet taken that first step to writing a Java program. If you are one of them, this tutorial is for you. (If you're an experienced developer, show students, juniors, friends and family this tutorial to get them started). (more…)

Java 14 packs a lot of Java language features for you. It includes Records and Pattern Matching for instanceof as preview language features, and Text Blocks in the second preview. It also adds Switch Expressions as a Standard language Feature. With Records, you get a compact syntax for declaring data classes. By using just a single line of code, you can model your data with ease. Don’t worry – the compiler does the heavy lifting to add the methods required to make the class work for you. (more…)

Our Reactive Spring Boot tutorial is finally complete! So our end-of-year gift to you is to wrap it all up into a single blog post, where you can easily find each of the tutorial steps, the code, and the full video of the original demo.  Happy coding! Part 1 - A Kotlin REST Service Part 2 - A REST Client for Reactive Streams Part 3 - A JavaFX Spring Boot Application Part 4 - A JavaFX Line Chart Part 5 - Auto-configuration for Shared Beans Part 6 - Displaying Reactive Data Part 7 – Subscribing Multiple Consumers Part 8 – Kotlin RSocket Server Part 9 – Java RSocket Client P

In this lesson we look at how to use Spring beans from one module in a different module, using auto-configuration. This is the fifth part of our tutorial showing how to build a Reactive application using Spring Boot, Kotlin, Java and JavaFX.  The original inspiration was a 70 minute live demo. This blog post contains a video showing the process step-by-step and a textual walk-through (adapted from the transcript of the video) for those who prefer a written format. (more…)

A while ago, I was studying the output of IntelliJ IDEA’s static analyzer for Java code and came across an interesting case. Since the code fragment was not open source, I’ve anonymized it and removed the external dependencies. Let's just say it looked something like this: private static List process(Map options, List inputs) { List res = new ArrayList(); int cur = -1; for (String str : inputs) { if (str.startsWith("-")) if (options.containsKey(str)) { if (cur == -1) cur = options.get(str); } else if (options.cont

With Text Blocks, Java 13 is making it easier for you to work with multi-line String values. You would no longer need concatenation operators or escape sequences for your HTML, XML, JSON, or SQL queries, stored as String values. Java 13 has also modified the Switch Expressions, which was released with Java 12. In this blog, you'll cover how to use the language changes introduced with Java 13, in IntelliJ IDEA 2019.3. If you can’t migrate your code to Java 13 to use Text Blocks, this blog will also cover how to use language or reference injections, so that you can edit multi-line String v

Every professional developer was once a learner. We live in a fascinating world full of new challenges and opportunities, which means every professional developer can become a learner once again, or share what they have learned as an educator. No matter what role suits you best, IntelliJ IDEA is here for you. Please welcome IntelliJ IDEA Edu – a brand new flavor of the IDE joining our Community and Ultimate editions. It is now available for preview in our IntelliJ IDEA Edu 2019.3 EAP (Early Access Program). IntelliJ IDEA Edu supports Java, Kotlin, and Scala. As a learner, you can pra

This month we have a guest section on security, since there were so many relevant security articles to include. We have the results of two developer surveys, and a huge culture and community section that explores some of the factors that might contribute to the results of those developer surveys. Of course, May's Annotated Monthly also includes your regular fix of Java news, tutorials, and tips. (more…)

New year, new style?  This month we're experimenting with a simpler format for JAM, so you can see at a glance the real titles of the articles being linked to.  The upside is more links! More news! And you can see all the topics at a glance.  The downside? Less witty banter from yours truly.  Let us know in the comments whether you prefer the "usual" format or the new.  As always, we will cover what's new in the Java world and throw in other bits and pieces that seem interesting for developers. (more…)

In this week's Git questions we take a look at a simple but rather important step when you're working on a GitHub Open Source project - how do you get started? In the video, Gary and I demonstrate how to fork and clone a project (I chose some Spring example code and Gary chose a JavaScript framework) and how to set up additional remotes so that you can easily keep your fork up-to-date as per our last video. This time Gary's demonstrating the functionality in WebStorm while I stick with IntelliJ IDEA, as usual the features we demonstrate are common to all the IntelliJ Platform IDEs.