Attila Magyar created SHIRO-841:
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             Summary: NullPointerException from SessionsSecurityManager.start()
                 Key: SHIRO-841
                 URL: https://issues.apache.org/jira/browse/SHIRO-841
             Project: Shiro
          Issue Type: Task
            Reporter: Attila Magyar


We see this NPE intermittently from KNOX when a topology is being redeployed 
and a request is still being processed in Shiro's AuthenticatingFilter.

In DelegatingSubject.java:
{code:java}
log.trace("Starting session for host {}", getHost());
SessionContext sessionContext = createSessionContext();
// At this point the topology deploy already triggered a 
securityManager.destroy() so sessionManager is null
Session session = this.securityManager.start(sessionContext); 
this.session = decorate(session); {code}
This is not a critical problem since the request will fail no matter what, but 
NPE suggests a programming error instead of a normal operation.

I suggest putting a null check in securityManager.start() and throw an 
IllegalStateException("Session already destroyed") or something similar.



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