I find the bug.
It is in the cache of jboss serialization = 1.0.0.RC1
Fix in 1.0.0CR6 of jboss-serialization, but performance degree.
"Rare Duplications On System.identityHashMap can cause exception"
Warning: May cause a lot of errors, like a "select sum(*) from salary" in a database return 111658.90
and iterate a collection of java objects return 111500.90.