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We have been still analyzing this problem - the main problem seems to be frequent garbage collection in 'Old Space' - we had the JVM setting as -XXtlasize:min=8k,preferred=64k
-XXlargeobjectlimit:8k - so larger objects were getting copied directly into the 'Old Space' instead of 'Nursery Space'. Oracle has recommended to install a JRockit patch (Doc ID 1209624.1) and change the JVM setting. We need to try those things out in our Production environment.