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In general, it's simpler to start by building your code in your familiar build environment, and test it by running it on JDK 9, than to start by building it on JDK 9. The tools and libraries used in your build process might themselves not yet have been tested with JDK 9 by their developers.

Running on JDK 9

Some of the changes targeted for JDK 9 might affect code that relies on deprecated, removed, unsupported, internal or unspecified functionality. The list below has been compiled from the list of JEPs targeted for JDK 9 and other resources. It is not an exhaustive list of changes - there may be other changes you run into that have not been listed here.

Where available, the list provides links to further resources, like JEPs, mailing list threads or JBS issues.

Running on JDK 9

Unified JVM Logging

This JEP might change log message formats and possibly the meaning of some JVM options.

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