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Re:JDK 9 General-Availability Release by kuschku on Thursday September 21, 2017 @06:13PM (#15307807)
From the article:

> JDK 9 downloads are larger than JDK 8 downloads because they include JMOD files so that you can create custom run-time images. To learn about JMOD files see the Project Jigsaw Quick-Start Guide and JEP 282.

Re:JDK 9 General-Availability Release by silb on Friday September 22, 2017 @03:43AM (#15310135)
The javac compiler has a new option "--release" which can compile against previous Java releases 6, 7 and 8. So the new JDK bundles parts of the previous releases.