Memory Leak caused by ThreadLocalMap - The suspect is com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet

Hi,

In my project I am using using gwt-2.4.0. The server side business wrapper extends com.google.gwt.user.server.rpc.RemoteServiceServlet, deployed on WebSphere Application Server7 (JDK1.6, with JEE5 compliance).

I have a memory leak on the server side (I expected low memory usage values due to the stateless approach with GWT as opposite to JSF for example - one of the main reasons why I used GWT in the first place). After analyzing the heap dumps the cause is java.lang.ThreadLocal$ThreadLocalMap$Entry with over 400.000 entries.

Dinging to find the reason I have come across other people experiencing similar situations caused by the usage of ThreadLocal in a improper manner.

See: http://stackoverflow.com/questions/3984256/lots-of-threadlocalmap-entries-in-memory and http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6625723

The current implementation of com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet uses two instances of ThreadLocal to wrap the HttpServletRequest and HttpServiceResponse objects. (both are not static; couldn't see any calls to remove; "this" is in the sychronized block - couple of things that triggered my suspicions).

Did anybody faced similar issues?

With thanks,

Tiberiu

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