Github user danielsun1106 commented on the pull request: https://github.com/apache/groovy/commit/63fc0a4036538fcf329d3a5b104dd32aa56d2d56#commitcomment-27737030 In src/install/install-jdk.sh: In src/install/install-jdk.sh on line 1: I just added OpenJDK9 build to run groovy tests on OpenJDK9. As for the JVM tuning, I found GC costs a lot of time when running tests, so I enabled the CMS GC.
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