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https://issues.apache.org/jira/browse/FELIX-5389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611064#comment-15611064
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Raymond Augé commented on FELIX-5389:
-------------------------------------
BTW, this feels very much like the same NPE I've noted here:
https://github.com/bndtools/bnd/issues/1697
> NullPointerException in Candidates#prepare() method
> ---------------------------------------------------
>
> Key: FELIX-5389
> URL: https://issues.apache.org/jira/browse/FELIX-5389
> Project: Felix
> Issue Type: Bug
> Components: Resolver
> Affects Versions: resolver-1.10.0
> Reporter: matteo rulli
>
> Project where the errors appear:
> https://github.com/mrulli/com.flairbit.eclipsecon.onesix
> ----
> During the resolution of my bundles I get the following stacktrace (to
> trigger the resolution, just do {{mvn install}} from the
> {{example.cassandra.itest.bndrun}} folder in the project above):
> {code}
> [ERROR] Failed to execute goal
> biz.aQute.bnd:bnd-export-maven-plugin:3.4.0-SNAPSHOT:export (default) on
> project example.cassandra.bndrun: null: MojoExecutionException:
> NullPointerException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal biz.aQute.bnd:bnd-export-maven-plugin:3.4.0-SNAPSHOT:export (default) on
> project example.cassandra.bndrun: null
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
> at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
> Caused by: org.apache.maven.plugin.MojoExecutionException
> at aQute.bnd.maven.export.plugin.ExportMojo.execute(ExportMojo.java:52)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
> ... 19 more
> Caused by: java.lang.NullPointerException
> at org.apache.felix.resolver.Candidates.prepare(Candidates.java:946)
> at
> org.apache.felix.resolver.ResolverImpl.getInitialCandidates(ResolverImpl.java:502)
> at org.apache.felix.resolver.ResolverImpl.doResolve(ResolverImpl.java:387)
> at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:375)
> at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:329)
> at biz.aQute.resolve.BndResolver.resolve(BndResolver.java:29)
> at biz.aQute.resolve.ResolveProcess.resolveRequired(ResolveProcess.java:75)
> at biz.aQute.resolve.ProjectResolver.resolve(ProjectResolver.java:109)
> at biz.aQute.resolve.ProjectResolver.getRunBundles(ProjectResolver.java:126)
> at aQute.bnd.maven.export.plugin.ExportMojo.resolve(ExportMojo.java:86)
> at aQute.bnd.maven.export.plugin.ExportMojo.export(ExportMojo.java:70)
> at aQute.bnd.maven.export.plugin.ExportMojo.execute(ExportMojo.java:49)
> ... 21 more
> {code}
> I tried to investigate a little bit this and I found that the NPE is
> generated in the {{prepare()}} method -
> {{org.apache.felix.resolver.Candidates}} class, within the following snippet:
> {code}
> m_candidateMap.put(r, cands.copy());
> for (Capability cand : cands.getRemainingCandidates())
> {
> Set<Requirement> dependents = m_dependentMap.get(cand);
> dependents.remove(origReq);
> dependents.add(r);
> }
> {code}
> {{org.apache.felix.resolver.Candidates.m_dependentMap.get}} is invoked with
> key
> {code}
> WrappedCapability: '[slf4j.api version=1.6.1] osgi.wiring.package;
> org.slf4j.impl'
> m_cap: Provide[osgi.wiring.package]{version=1.6.1,
> osgi.wiring.package=org.slf4j.impl}{}
> m_host: slf4j.api version=1.6.1
> {code}
> and this nullifies {{dependents}} var. The only WrappedCapabilities within
> the m_dependentMap key set are the followings:
> {code}
> [slf4j.api version=1.7.7] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j)(version>=1.6.1))
> [slf4j.api version=1.7.5] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.spi)(version>=1.6.1))
> [slf4j.api version=1.7.5] osgi.wiring.package;
> (&(osgi.wiring.package=org.apache.log4j))
> [slf4j.api version=1.6.1] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.impl)(version>=1.6.0))
> [slf4j.api version=1.7.5] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.helpers)(version>=1.6.1))
> [slf4j.api version=1.7.7] osgi.wiring.package;
> (&(osgi.wiring.package=org.apache.log4j))
> [slf4j.api version=1.7.7] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.helpers)(version>=1.6.1))
> [slf4j.api version=1.7.5] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.impl)(version>=1.6.0))
> [slf4j.api version=1.7.7] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.spi)(version>=1.6.1))
> [slf4j.api version=1.7.7] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.impl)(version>=1.6.0))
> [slf4j.api version=1.7.5] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j)(version>=1.6.1))
> {code}
> and none of them match the specified key above, at least as long as the
> WrappedCapability equals method is concerned.
> In my opinion a meaningful error should be thrown by the resolver instead of
> throwing NullPointerException. Or maybe it is just enough to skip actions on
> dependents in case null value is returned?
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