Scott,

Given that TimedCachePolicy is created thread-safe, the code try to insert into 
it are wrapped in synchronized block and it is always try to remove existing 
entry with same principal before insertion, but we still got 
IllegalStateException for "Attempt to insert duplicate entry", there must be 
other thing sneaked behind and changed the cache with principal of same name. 
Could you help identify what it could be?

So far, it happened only under scenario of different data sources reside on 
physically different servers, using the same set of encrypted 
username/password. But the severity of this problem is escalated, since we 
suspect it might actually cause JDBC connection leak.

Thanks for your help.

-Wei

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