I have two JVMs that are invoking put(blah, key, value) and get(blah, key) 
where blah is the same node in a TreeCacheAop instance.  The keys and the 
values are String instances.   A key, in this case, is a hashed version of its 
corresponding value which is just an FQN to another location in the cache.  
When many threads (200 or more) are creating nodes and adding key/value pairs 
for those nodes into the cache, I occassionaly get null back from the cache on 
a get invocation.   This occurs in between get invocations for the same key in 
which a value was returned.  At no time are key/value pairs being removed from 
the blah node, and at no time are other nodes being removed from the cache.

Can anyone help me postulate why this might be occurring?  I am using 
JBossCache 1.1.1 with an isolation level of SERIALIZEABLE (it happened with 
REPEATABLE_READ too) and with asynch replication.

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