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

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This exception has no message.
java.lang.NullPointerException:
at com.iplanet.dpro.session.jmqdb.PersistSession.setString(PersistSession.java:310)
at com.iplanet.dpro.session.jmqdb.JMQSessionRepository.save(JMQSessionRepository.java:357)
at com.iplanet.dpro.session.service.SessionService.saveForFailover(SessionService.java:2756)
at com.iplanet.dpro.session.service.InternalSession.updateForFailover(InternalSession.java:1060)
at com.iplanet.dpro.session.service.InternalSession.setIsISStored(InternalSession.java:588)
at com.sun.identity.authentication.service.LoginState.updateSessionForFailover(LoginState.java:4390)
at com.sun.identity.authentication.service.AMLoginContext.runLogin(AMLoginContext.java:420)
at com.sun.identity.authentication.server.AuthContextLocal.submitRequirements(AuthContextLocal.java:472)
at com.sun.identity.authentication.UI.LoginViewBean.processLoginDisplay(LoginViewBean.java:1101)
at com.sun.identity.authentication.UI.LoginViewBean.processLogin(LoginViewBean.java:676)
at com.sun.identity.authentication.UI.LoginViewBean.forwardTo(LoginViewBean.java:408)
at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:981)
at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
at com.iplanet.jato.ApplicationServletBase.doPost(ApplicationServletBase.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:807)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:908)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
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 com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:161)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:580)

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