travis-ci/travis-cookbooks — pull request #149 by rockymadden (2013-02-03 00:33:42+00:00)
Title: sbt javaopts flags

In OpenJDK 6 and 7, the CMSClassUnloadingEnabled flag does not do anything without also using UseConcMarkSweepGC. This can be confirmed by downloading the OpenJDK source, and viewing hotspot/src/share/vm/runtime/globals.hpp. You can see that by default UseConcMarkSweepGC is set to false. Thus, CMSClassUnloadingEnabled will not do anything without it.