[cas-dev] NullPointerException in externalRedirect endstate

[Renaud Bruyeron]

Hi,

I am running into a problem with the "gateway" mode of CAS 3.0.5.
The client webapp always triggers a "gateway" roundtrip with CAS if it 
knows that its identity info is stale (for example when the HttpSession 
is created) so it can get the new identity.

However, it triggers a NPE in some conditions. Below is an extract of 
the logs (in DEBUG) which shows the execution of the webflow, and the 
stacktrace when the externalRedirect endstate is reached:

2006-06-21 18:46:52,559 DEBUG 
[org.jasig.cas.web.flow.AutomaticCookiePathSetterAction] - <Action 
'AutomaticCookiePathSetterAction' beginning execution>
2006-06-21 18:46:52,559 DEBUG 
[org.jasig.cas.web.flow.AutomaticCookiePathSetterAction] - <Action 
'AutomaticCookiePathSetterAction' completed execution; result is 'success'>
2006-06-21 18:46:52,559 DEBUG 
[org.jasig.cas.web.flow.TicketGrantingTicketExistsAction] - <Action 
'TicketGrantingTicketExistsAction' beginning execution>
2006-06-21 18:46:52,560 DEBUG 
[org.jasig.cas.web.flow.TicketGrantingTicketExistsAction] - <Action 
'TicketGrantingTicketExistsAction' completed execution; result is 
'ticketGrantingTicketExists'>
2006-06-21 18:46:52,560 DEBUG 
[org.jasig.cas.web.flow.HasServiceCheckAction] - <Action 
'HasServiceCheckAction' beginning execution>
2006-06-21 18:46:52,560 DEBUG 
[org.jasig.cas.web.flow.HasServiceCheckAction] - <Action 
'HasServiceCheckAction' completed execution; result is 'hasService'>
2006-06-21 18:46:52,561 DEBUG 
[org.jasig.cas.web.flow.RenewRequestCheckAction] - <Action 
'RenewRequestCheckAction' beginning execution>
2006-06-21 18:46:52,561 DEBUG 
[org.jasig.cas.web.flow.RenewRequestCheckAction] - <Action 
'RenewRequestCheckAction' completed execution; result is 
'generateServiceTicket'>
2006-06-21 18:46:52,561 DEBUG 
[org.jasig.cas.web.flow.GenerateServiceTicketAction] - <Action 
'GenerateServiceTicketAction' beginning execution>
2006-06-21 18:46:52,562 DEBUG 
[org.jasig.cas.ticket.registry.DefaultTicketRegistry] - <Attempting to 
retrieve ticket [TGT-3-0Vw02NvOVnLcK2DHQ4qElTfw641BV1nasgK-50]>
2006-06-21 18:46:52,562 DEBUG 
[org.jasig.cas.web.flow.GenerateServiceTicketAction] - <Action 
'GenerateServiceTicketAction' completed execution; result is 'gateway'>
2006-06-21 18:46:52,563 ERROR 
[org.apache.catalina.core.ContainerBase.[Catalina].[xxxxx.f6.fr].[/cas].[cas]] 
- <Servlet.service() for servlet cas threw exception>
java.lang.NullPointerException: target is null for method indexOf
         at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:821)
         at ognl.ASTMethod.getValueBody(ASTMethod.java:75)
         at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
         at ognl.SimpleNode.getValue(SimpleNode.java:210)
         at ognl.ASTChain.getValueBody(ASTChain.java:109)
         at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
         at ognl.SimpleNode.getValue(SimpleNode.java:210)
         at ognl.ASTNotEq.getValueBody(ASTNotEq.java:49)
         at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
         at ognl.SimpleNode.getValue(SimpleNode.java:210)
         at ognl.ASTTest.getValueBody(ASTTest.java:49)
         at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
         at ognl.SimpleNode.getValue(SimpleNode.java:210)
         at ognl.Ognl.getValue(Ognl.java:333)
         at ognl.Ognl.getValue(Ognl.java:310)
         at 
org.springframework.binding.expression.support.OgnlExpression.evaluateAgainst(OgnlExpression.java:60)
         at 
org.springframework.binding.expression.support.CompositeStringExpression.evaluateAgainst(CompositeStringExpression.java:33)
         at 
org.springframework.webflow.support.ExternalRedirectSelector.makeSelection(ExternalRedirectSelector.java:73)
         at org.springframework.webflow.EndState.doEnter(EndState.java:127)
         at org.springframework.webflow.State.enter(State.java:192)
         at 
org.springframework.webflow.Transition.execute(Transition.java:216)
         at 
org.springframework.webflow.TransitionableState.onEvent(TransitionableState.java:80)

My guess is that ${requestScope.service} is null, even though it should 
not be since hasServiceCheckAction returned "hasService".
Before I go digging inside webflow and CAS, do you have any idea on what 
could be the problem?

  - Renaud