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

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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.coyote.http11.Http11Processor.process(
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(

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