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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.apache.tomcat.websocket.server.WsServerContainer.unregisterAuthenticatedSession()
    2. Tomcat WS
      WsSessionListener.sessionDestroyed
      1. org.apache.tomcat.websocket.server.WsServerContainer.unregisterAuthenticatedSession(WsServerContainer.java:367)
      2. org.apache.tomcat.websocket.server.WsServerContainer.unregisterSession(WsServerContainer.java:344)
      3. org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:494)
      4. org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:417)
      5. org.apache.tomcat.websocket.WsSession.close(WsSession.java:394)
      6. org.apache.tomcat.websocket.server.WsServerContainer.closeAuthenticatedSession(WsServerContainer.java:377)
      7. org.apache.tomcat.websocket.server.WsSessionListener.sessionDestroyed(WsSessionListener.java:40)
      7 frames
    3. Glassfish Core
      ContainerBase$ContainerBackgroundProcessor.run
      1. org.apache.catalina.session.StandardSession.expire(StandardSession.java:808)
      2. org.apache.catalina.session.StandardSession.isValid(StandardSession.java:658)
      3. org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:534)
      4. org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:519)
      5. org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1352)
      6. org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
      7. org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
      8. org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
      9. org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
      9 frames
    4. Java RT
      Thread.run
      1. java.lang.Thread.run(Unknown Source)
      1 frame