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https://issues.apache.org/jira/browse/SHIRO-841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar updated SHIRO-841:
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Priority: Minor (was: Major)
> NullPointerException from SessionsSecurityManager.start()
> ---------------------------------------------------------
>
> Key: SHIRO-841
> URL: https://issues.apache.org/jira/browse/SHIRO-841
> Project: Shiro
> Issue Type: Task
> Reporter: Attila Magyar
> Priority: Minor
>
> 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.
>
> See https://issues.apache.org/jira/browse/KNOX-2297 for more context.
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