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Attempting to run Fusion Middleware Apps with JDK 6_20 64-bit and these arguments: -Xmx6g -Xms6g -XX:+UseCompressOops During start of the server, the JVM consistently core dumps. hs_err file attached to bug; core file in ftp://javaperf.sfbay.sun.com/pub/cores/core/core.30212.gz Error is # Internal Error (nmethod.cpp:1836), pid=30212, tid=1126521152 # Error: guarantee(cont_offset != 0,"unhandled implicit exception in compiled code") I have no problem running this test without CompressedOops. I've also tried 6_21 builds without success. It is the usual Fusion Middleware setup, meaning very difficult to setup and move to other systems. Please contact me for access to machine.