Runnin WLS 10.3.5. on JRockit R28.1.3-11-141760-1.6.0_24-20110301-1432-linux-x86_64) we experience a memory leak in production. I got to obtain an hprof dump, which I analyzed with eclipse MAT. The MAT result is pretty clear but I'm not sure what the cause is. There's one object of com.sun.xml.ws.server.WSEndpointImpl with a growing retained heap, at the moment of the memory dump it was 929 MB. Here's the important part of the dominator tree:
I assume these Instances are being created when an erroneous webservice (caught by the application) call happens. At least it doesn't happen with every webservice call, the total number of allocations are lower than the total number of requests in the timeframe.