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https://issues.apache.org/jira/browse/FELIX-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869606#comment-15869606
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Pierre De Rop commented on FELIX-5548:
--------------------------------------

Thomas,

just to say I'm not able to investigate this immediately (will only be able to 
do it this week end).
what I can say is that I have the NPE in an abnormal situation: I have 
voluntarily removed a bundle in order to reproduce the issue.

Now, I know that Karl want to make a release quickly, but I don't want to block 
it ... so may be karl can go ahead with a new release and I will  then 
investigate this issue later,  when I have time.





> NPE in Candidates.remove() method.
> ----------------------------------
>
>                 Key: FELIX-5548
>                 URL: https://issues.apache.org/jira/browse/FELIX-5548
>             Project: Felix
>          Issue Type: Bug
>          Components: Resolver
>    Affects Versions: resolver-1.10.0
>            Reporter: Pierre De Rop
>         Attachments: felix.log
>
>
> Hi;
> I'm using framework 5.6.1 (which uses resolver 1.10.0).
> We are refactoring an old application which have problems, and while 
> debugging (with felix.log.level=4), I got the following null pointer in the 
> Candidates.remove method:
> Here is the NPE (I don't see the NPE with felix.log.level=1)
> {code}
> java.lang.NullPointerException
>       at org.apache.felix.resolver.Candidates.remove(Candidates.java:1122)
>       at org.apache.felix.resolver.Candidates.remove(Candidates.java:1070)
>       at org.apache.felix.resolver.Candidates.populate(Candidates.java:244)
>       at 
> org.apache.felix.resolver.Candidates.populateDynamic(Candidates.java:475)
>       at 
> org.apache.felix.resolver.ResolverImpl.getInitialCandidates(ResolverImpl.java:470)
>       at 
> org.apache.felix.resolver.ResolverImpl.doResolve(ResolverImpl.java:387)
>       at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:649)
>       at 
> org.apache.felix.framework.StatefulResolver.resolve(StatefulResolver.java:620)
>       at 
> org.apache.felix.framework.BundleWiringImpl.searchDynamicImports(BundleWiringImpl.java:1652)
>       at 
> org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1552)
>       at 
> org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:79)
>       at 
> org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2018)
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
>       at java.lang.Class.forName0(Native Method)
>       at java.lang.Class.forName(Class.java:264)
>       at org.apache.log4j.helpers.Loader.loadClass(Loader.java:179)
>       at 
> org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:237)
>       at 
> org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:171)
>       at 
> org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:184)
>       at 
> org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:502)
>       at 
> org.apache.log4j.xml.DOMConfigurator.parseCategory(DOMConfigurator.java:415)
>       at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:919)
>       at 
> org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:790)
>       at 
> org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:696)
>       at 
> org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
>       at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
>       at org.apache.log4j.Logger.getLogger(Logger.java:118)
>       at 
> com.alcatel.as.service.metering2.SimpleMonitorable.<clinit>(SimpleMonitorable.java:20)
>       at alcatel.tess.hometop.gateways.osgi.Activator.init(Activator.java:41)
>       at 
> org.apache.felix.dm.DependencyActivatorBase.start(DependencyActivatorBase.java:75)
>       at 
> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)
>       at org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)
>       at org.apache.felix.framework.Felix.startBundle(Felix.java:2144)
>       at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl$DeployedBundle.start(BundleInstallerImpl.java:1056)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.startBundles(BundleInstallerImpl.java:728)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.finishInitialisation(BundleInstallerImpl.java:230)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.frameworkEvent(BundleInstallerImpl.java:213)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.start(BundleInstallerImpl.java:174)
>       at 
> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)
>       at org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)
>       at org.apache.felix.framework.Felix.startBundle(Felix.java:2144)
>       at org.apache.felix.framework.Felix.updateBundle(Felix.java:2484)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:1018)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:1004)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.checkSelfUpdate(BundleInstallerImpl.java:273)
>       at 
> com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl.frameworkEvent(BundleInstallerImpl.java:192)
>       at 
> org.apache.felix.framework.EventDispatcher.invokeFrameworkListenerCallback(EventDispatcher.java:881)
>       at 
> org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:830)
>       at 
> org.apache.felix.framework.EventDispatcher.run(EventDispatcher.java:1147)
>       at 
> org.apache.felix.framework.EventDispatcher.access$000(EventDispatcher.java:54)
>       at 
> org.apache.felix.framework.EventDispatcher$1.run(EventDispatcher.java:102)
>       at java.lang.Thread.run(Thread.java:745)
> {code}
> I don't know if the NPE above has already been fixed, maybe in FELIX-5389 ? I 
> tried to rebuild the latest framework and resolver from the trunk, but I'm 
> getting a compilation issue:
> {code}
> [ERROR] 
> /tmp/xx/framework/src/main/java/org/apache/felix/framework/ResolveContextImpl.java:[44,8]
>  org.apache.felix.framework.ResolveContextImpl is not abstract and does not 
> override abstract method getSubstitutionWires(org.osgi.resource.Wiring) in 
> org.apache.felix.resolver.FelixResolveContext
> {code}



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