Clover HTML reporter can hang on JRockit with numThreads > 0

"Clover-Thread-59" id=112 idx=0x1c0 tid=28824 prio=5 alive
at java/util/HashMap.getEntry(HashMap.java:427)
at java/util/HashMap.containsKey(HashMap.java:413)
at com/cenqua/clover/context/ContextStore.getContextsAsString(ContextStore.java:257)
at com/cenqua/clover/reporters/html/source/SourceRenderHelper.gatherSrcRenderInfo(SourceRenderHelper.java:278)
at com/cenqua/clover/reporters/html/source/SourceRenderHelper.insertLineInfosForFile(SourceRenderHelper.java:83)
at com/cenqua/clover/reporters/html/RenderFileAction.insertLineInfos(RenderFileAction.java:284)
at com/cenqua/clover/reporters/html/RenderFileAction.render(RenderFileAction.java:131)
at com/cenqua/clover/reporters/html/RenderFileAction.call(RenderFileAction.java:115)
at com/cenqua/clover/util/CloverExecutors$LoggingCallable.call(CloverExecutors.java:86)
at clover/retrotranslator/edu/emory/mathcs/backport/java/util/concurrent/FutureTask.run(FutureTask.java:178)
at clover/retrotranslator/edu/emory/mathcs/backport/java/util/concurrent/ThreadPoolExecutor.runWorker(ThreadPoolExec
utor.java:1061)
at clover/retrotranslator/edu/emory/mathcs/backport/java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExe
cutor.java:575)
at java/lang/Thread.run(Thread.java:619)
at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method)
- end of trace