I have a treecache registered as a WebLogic startup class. After about a half an hour, the reference to an attribute in the cache appears to expire.
I had set the time to live to 0 (forever). But, it still expires after a half hour. Here is the section of the treecache.xml:
5000
0
0
Make sure your region is defined coorectly. You can try it out in standalone mode first.
-Ben