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Users who are using any of the flags that are being removed will have to update their JVM-startup command lines. If they are moving from JDK 8 to JDK 9 then they will already have seen warning messages and thus should not be surprised. For a detailed list of the flags and flag combinations that have stopped working in JDK 9, please consult the JEP text.

Modular Run-Time Images

This JEP 220 may affect code that relies on the removed endorsed-standards override mechanism, the removed extension mechanism, and the existence of rt.jar and tools.jar files as well as the old directory layout of files in the JDK & JRE installation image.

New Version-String Scheme

This JEP 223 may affect code that relies on the old version string scheme to distinguish major, minor, and security-update releases.

Remove Launch-Time JRE Version Selection

This JEP 231 may affect code that relies on the removed ability to request, at JRE launch time, a version of the JRE that is not the JRE being launched.

Remove the JVM TI hprof Agent

This JEP 240 may affect code that relies on the removed hprof agent library as part of the JDK.

Remove the jhat Tool

This JEP 241 may affect code that relies on the removed experimental, unsupported, and out-of-date jhat tool.

Milling Project Coin

This JEP 213 may affect source code that uses underscore ("_") as an identifier. Its use generated a warning as of Java SE 8, and has been turned into an error in JDK 9.

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