GWT R PC ON SERVER START JAVA THREADS

Hi,
i have a problem,
on Client side i make an RPC call to the server and at server side , in the called function
i am trying to start independent java threads unfortunetly i am getting  an exception, what should i do




Exception:
 java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:252)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:277)
    at java.lang.ThreadGroup.checkAccess(Unknown Source)
    at java.lang.Thread.init(Unknown Source)
    at java.lang.Thread.<init>(Unknown Source)
    at java.util.concurrent.Executors$DefaultThreadFactory.newThread(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.addThread(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.addIfUnderCorePoolSize(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source)
    at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
   



 

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