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java.lang.NullPointerException: 	at com.iplanet.dpro.session.jmqdb.PersistSession.setString(PersistSession.java:310)	at com.iplanet.dpro.session.jmqdb.JMQSessionRepository.delete(JMQSessionRepository.java:306)	at com.iplanet.dpro.session.service.SessionService.removeInternalSession(SessionService.java:681)	at com.iplanet.dpro.session.service.SessionService.destroyInternalSession(SessionService.java:1006)	at com.sun.identity.authentication.service.AuthD.destroySession(AuthD.java:505)	at com.sun.identity.authentication.service.LoginState.destroySession(LoginState.java:1029)	at com.sun.identity.authentication.service.AMLoginContext.destroySession(AMLoginContext.java:602)	at com.sun.identity.authentication.service.AMLoginContext.logout(AMLoginContext.java:579)	at com.sun.identity.authentication.server.AuthContextLocal.logout(AuthContextLocal.java:500)	at com.sun.identity.authentication.UI.LogoutViewBean.forwardTo(LogoutViewBean.java:260)	at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:981)	at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)	at com.iplanet.jato.ApplicationServletBase.doGet(ApplicationServletBase.java:459)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:787)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:908)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.sun.mobile.filter.AMLController.doFilter(AMLController.java:163)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:280)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:209)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509)	at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:161)	at com.iplanet.ias.web.WebContainer.service(WebContainer.java:580)