https://issues.apache.org/jira/browse/EXTSCRIPT-117 It was a threading issue, since we run our tests multithreaded to save time, I now added a monitor to keep the threading issue in the affected parts at bay, if this does not resolve it we will switch back to non threaded testing.
myfaces/extensions/scripting/trunk/extscript-core-root/extscript-core/src/test/java/org/apache/myfaces/extensions/scripting/core/reloading/SimpleReloadingStrategyTest.java