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From "Rob Walker (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-3160) NPE in BundleRevisionImpl.close() when uninstalling a bundle
Date Fri, 02 Dec 2011 09:37:39 GMT

    [ https://issues.apache.org/jira/browse/FELIX-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161507#comment-13161507
] 

Rob Walker commented on FELIX-3160:
-----------------------------------

Yay! 

Finally nailed the recreation part. What triggers it is the refreshPackages call in the Activator
sample code above. That only happens for a bundle with no exports, which wasn't the case for
shell.gui. Swapping to an alternate bundle for the start -t and i can now recreate. Will tidy
up my full example and post just now
                
> NPE in BundleRevisionImpl.close() when uninstalling a bundle
> ------------------------------------------------------------
>
>                 Key: FELIX-3160
>                 URL: https://issues.apache.org/jira/browse/FELIX-3160
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: framework-4.0.0
>            Reporter: Rob Walker
>            Assignee: Rob Walker
>            Priority: Minor
>             Fix For: framework-4.2.0
>
>         Attachments: Activator.java
>
>
> There seems to be a case where m_content can be null when uninstalling a bundle, causing
the following code to throw an NPE:
>     synchronized void close()
>     {
>         try
>         {
>             resolve(null);
>         }
>         catch (Exception ex)
>         {
>             ((BundleImpl) m_bundle).getFramework().getLogger().log(
>                 Logger.LOG_ERROR, "Error releasing revision: " + ex.getMessage(), ex);
>         }
>         
>        m_content.close();
> I've added a simple check for null around the close in my version to avoid the exception,
which I'll check in.
> I'm not sure of the scenarios where this can legally be null at this point, and whether
there's some nastier underlying circumstance that needs investigating. We see it under the
following circumstances:
> * we register a listener that looks for framework STARTED
> * when triggered, this iterates all bundles and performs an uninstall on ones which we
determine are zombies leftover from a previous run
> Aside from the fact we're calling uninstall from inside an event handling method, there
doesn't anything else unusual about this code.

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