Support for CSS in GWT ui.xml files

On the 10th July 2020, JetBrains hosted a Technology Day for Java. We had 10 presentations and the videos for them are available here. Over the coming weeks, in no particular order, we'd like to share with you extra resources that our speakers kindly provided and any links to further reading or code samples. We hosted Trisha Gee talking to us everything that's happened since Java 8. Java 8 was a huge release for Java, finally bringing some much anticipated functional behaviours to the Java language. Java 9 followed up and although the module system is really interesting for certain types of ap

Java 15 introduces a new language feature – sealed classes and interfaces. The language syntax allows you to restrict the classes or interfaces that can extend or implement other classes or interfaces. The goal is to let you define the possible hierarchies in your business domain in a declarative manner, so that it is easier to process them. This language feature is introduced as a preview language feature. Java 15 also modifies the preview language feature Records, introduced in Java 14, and enhances the interfaces and enums you are used to working with. Pattern Matching for instanceof, intro