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

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java.lang.NullPointerException:
at net.sf.acegisecurity.providers.jaas.JaasAuthenticationProvider.handleLogout(JaasAuthenticationProvider.java:424)
at net.sf.acegisecurity.providers.jaas.JaasAuthenticationProvider.onApplicationEvent(JaasAuthenticationProvider.java:413)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:45)
at net.sf.acegisecurity.ui.session.HttpSessionEventPublisher.sessionDestroyed(HttpSessionEventPublisher.java:107)
at com.ibm.ws.webcontainer.httpsession.SessionContext.sessionDestroyedEvent(SessionContext.java:3417)

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