It's not clear how the fix can actually solve the problem even if two 
JaasSecurityManager can be created for the same SecurityDomain, each with its 
own TimedCahePolicy object 

In order for this exception to occur, there must be some code calling 
TimedCachePolicy.insert() inbetween outside a synchronized block. Yet 
JaasSecurityManager.updateCache() seems to be the only caller of that method by 
searching the codebase, which makes that condition unlikely to occur.

Scott, could you comment a bit more on that racing condition identified?

Thanks,
Sean




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