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It depends on the build system in use for the project.

In the days of Ant or if you let the IDE set it up for you without specifying a build, it was mostly:

src/
bin/

Maven and Gradle use the Maven Standard Directory Layout ( https://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html )

src
  main
    {lang}
      packages
    resources
  test
    {lang}
      packages
    resources

You can see that when using Gradle for groovy - https://docs.gradle.org/current/userguide/groovy_plugin.html#sec:groovy_project_layout the lang for the groovy sources is 'groovy'. This is important if you mix groovy, scala, kotlin, and java all in one project. For example (not my project, just one I found out there) https://github.com/bellingard/sample_multi-language-project

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In short, all you really need to do is add a dependency clause to your pom.xml and run maven. The pom should be located in the root directory of your project. For IntelliJ to recognize things you should 'import' the pom.xml (or enable auto-importing). If you hit View/Tool Windows/Maven in the menus (I think that's right, but don't have IntelliJ open) you will get a window with the controls do do that, and your dependency should resolve. More on reddit.com

JavaFX is a great framework for that use case but it needs some marketing love. At last JUG meeting people was genuinely convinced that Oracle killed it by popping it out the JDK.

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