Module handling, also known as project Jigsaw, is a feature that was made available only in Java 9. It was a long planned feature that the developers were waiting for. First it was planned for Java 7, but it was so complex that it got postponed to Java 8 and then to Java 9. A year ago, it seemed that it would get postponed again, but finally, the project code got into the early releases and now nothing can stop from being part of the release.