[jira] [Commented] (FELIX-3160) NPE in BundleRevisionImpl.close() when uninstalling a bundle

["Rob Walker (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161483#comment-13161483 ] 

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

Battling to recreate this one in an isolated environment.

Happens every time on a warm start of our application, but can't seem to isolate the combination of bundles & bindings that trigger it.
                
> 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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