java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.oc4j.network.ServerSocketAcceptHandler$IdleHandlers.closeIdleHandler(ServerSocketAcceptHandler.java:583)
at oracle.oc4j.network.ServerSocketAcceptHandler$IdleHandlers.expireHandlers(ServerSocketAcceptHandler.java:604)
at oracle.oc4j.network.ServerSocketAcceptHandler.selectorThreadHouseKeeping(ServerSocketAcceptHandler.java:217)
at oracle.oc4j.network.NIOServerSocketDriver.selfHouseKeeping(NIOServerSocketDriver.java:129)
at oracle.oc4j.network.NIOServerSocketDriver.run(NIOServerSocketDriver.java:149)
at com.evermind.server.http.HttpConnectionListener.run(HttpConnectionListener.java:294)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:298)
at java.lang.Thread.run(Thread.java:619)

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