Warning: dont do what we did, it broke things badly, making it possible for identity 
switches to occur mid-flight. The problem is with the shared use of the 
CallbackHandler (SecurityAssociationHandler). JaasSecurityManager uses the same 
instance of the handler to transfer principal/credentials back and forth between 
incoming calls to authenticate and the configured login modules. At the very least, 
defaultLogin(principal, crendential) needs to be synchronized, unless 
JAASSecurityManager is changed to create a new instance of the CallbackHandler for 
each request.

cheers
craig


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