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https://issues.apache.org/jira/browse/FELIX-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868005#comment-15868005
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Thomas Watson commented on FELIX-5548:
--------------------------------------
Any additional information about the candidate 'c' would be helpful. This
error is happening during dynamic import, perhaps from the org.apache.log4j
bundle since it is being driven by the method
org.apache.log4j.helpers.Loader.loadClass. But perhaps this is delegating to
another bundle's class loader. It is hard to tell for sure.
My initial suspicion was a cycle may be causing this, but I tried creating a
testcase with a cycle and didn't see anything going wrong with how cycles are
handled. My next guess would be having something to do with fragments. From
the log it looks like something called
com.alcatel.as.service.bundleinstaller.impl.BundleInstallerImpl is installing a
set of bundles and perhaps resolving them as it installs them. Once any
resolves it must be activating the bundles.
- What is the requirement 'r' which matches 'c'?
- What is the 'r.getResource()'?
- What is the implementation class of 'c'?
- What is the implementation class of 'c.getResource()'?
- Is the resource from 'c.getResource()' a fragment?
- Can you tell if there is a cycle during the resolution of the dynamic import?
> 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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