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This exception has no message.
java.lang.NullPointerException at org.apache.catalina.connector.HttpResponseBase.sendRedirect(HttpResponseBase.java:1121) at org.apache.catalina.connector.HttpResponseFacade.sendRedirect(HttpResponseFacade.java:178) at org.apache.catalina.authenticator.AuthenticatorBase.checkUserData(AuthenticatorBase.java:839) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:569) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:496) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505) at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158) at com.iplanet.ias.web.WebContainer.service(WebContainer.java:856)