Hi,

   Below mentioned is a stack trace of the exception which i am getting while accessing a particular JSP page through a SSO(Single Sign On) enabled server. Surprisingle it works completely fine when i switch SSO off.Attached is the JSP which i am referring to.

ERROR - [] [ajp-10.248.0.101-9009-8] - Cannot append null value

java.lang.NullPointerException

    at org.apache.coyote.ajp.AjpMessage.appendString(AjpMessage.java:242)

    at org.apache.coyote.ajp.AjpMessage.appendBytes(AjpMessage.java:178)

    at org.apache.coyote.ajp.AjpProcessor.prepareResponse(AjpProcessor.java:980)

    at org.apache.coyote.ajp.AjpProcessor.action(AjpProcessor.java:494)

    at org.apache.coyote.Response.action(Response.java:186)

    at org.apache.coyote.Response.sendHeaders(Response.java:386)

    at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:333)

    at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:314)

    at org.apache.catalina.connector.Response.flushBuffer(Response.java:557)

    at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:344)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)

    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)

    at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:436)

    at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:384)

    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451)

    at java.lang.Thread.run(Thread.java:662)