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java.lang.NullPointerException: 	at org.apache.catalina.authenticator.FormAuthenticator.forwardToLoginPage(	at org.apache.catalina.authenticator.FormAuthenticator.authenticate(	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(	at org.apache.catalina.core.StandardHostValve.invoke(	at org.apache.catalina.valves.ErrorReportValve.invoke(	at org.apache.catalina.core.StandardEngineValve.invoke(	at org.apache.catalina.connector.CoyoteAdapter.service(	at org.apache.coyote.http11.Http11Processor.process(	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(	at	at	at org.apache.tomcat.util.threads.ThreadPool$	at