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From "Richard S. Hall (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-3178) NPE in ResolverImpl
Date Fri, 18 Nov 2011 22:08:51 GMT

    [ https://issues.apache.org/jira/browse/FELIX-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153169#comment-13153169

Richard S. Hall commented on FELIX-3178:

Ok, I've gotten to the bottom of this second issue. It is actually completely unrelated to
the first issue, so technically we could open another bug on it, but it's probably not necessary.

This second issue has existed for a while, I believe. Essentially, candidates for bundle revisions
are populated in a recursive fashion. The approach must allow for cycles and does this by
essentially picking up where it left off on a given revision when it tries to populate a revision
that it is already populating.

With this approach, it is possible that a given revision can fail at a deeper level in the
recursion stack than where it started. However, there were certain scenarios where this would
go unnoticed at the higher level because resolve failures do not necessarily get thrown to
the top immediately.

To remedy this, after returning from a deeper recursion level, the algorithm must double check
to make sure that the revision it is resolving didn't already fail in a deeper level.
> NPE in ResolverImpl
> -------------------
>                 Key: FELIX-3178
>                 URL: https://issues.apache.org/jira/browse/FELIX-3178
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: framework-4.0.0
>         Environment: Also reproduced on 4.0.1
>            Reporter: Andreas Schlosser
>            Assignee: Richard S. Hall
>            Priority: Blocker
>             Fix For: framework-4.2.0
>         Attachments: MANIFEST.MF, npe.z01, npe.z02, npe.zip, npe2.z01, npe2.z02, npe2.z03,
npe2.z04, npe2.zip
> Bundle Resolution fails with NPE in both, Felix 4.0.0 and 4.0.1
> ERROR: Bundle com.springsource.com.sun.tools.xjc [119] Error starting file:bundles/com.springsource.com.sun.tools.xjc.jar
> java.lang.NullPointerException
>         at org.apache.felix.framework.resolver.ResolverImpl.mergeUses(ResolverImpl.java:856)
>         at org.apache.felix.framework.resolver.ResolverImpl.calculatePackageSpaces(ResolverImpl.java:659)
>         at org.apache.felix.framework.resolver.ResolverImpl.calculatePackageSpaces(ResolverImpl.java:609)
>         at org.apache.felix.framework.resolver.ResolverImpl.resolve(ResolverImpl.java:181)
>         at org.apache.felix.framework.StatefulResolver.resolve(StatefulResolver.java:168)
>         at org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:3811)
>         at org.apache.felix.framework.Felix.startBundle(Felix.java:1868)
>         at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1191)
>         at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:295)
>         at java.lang.Thread.run(Thread.java:662)

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