groovy/groovy-core — pull request #564 by PascalSchumacher (2014-12-23 09:29:16+00:00)
Title: GROOVY-7083: PermGen memory leak in ConfigSlurper.parse(Script script, U...

...RL location)

Remove the meta class of the compiled config script class after parsing.

I created a pull request out of Marcin Erdmanns suggestion in the jira ticket