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

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page becomes blank if i make a request after session is expired

This exception has no message.

db:: 3.81::SEVERE *** ERROR *** Exception during SOAPStreamReader initialization zd

This exception has no message.

java.lang.NullPointerException: 	at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:324)	at org.apache.catalina.authenticator.FormAuthenticator.saveRequest(FormAuthenticator.java:487)	at org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:236)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Unknown Source)