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

Remove GC Combinations Deprecated in JDK 8

This JEP might affect code that relies on the removed GC combinations. 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.

Building on JDK 9

Milling Project Coin

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

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