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https://jira.codehaus.org/browse/MDEP-364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=305277#comment-305277
]
Sergei Ivanov commented on MDEP-364:
------------------------------------
Looking for similar symptoms on the internet, I ran into a problem submitted by
myself some time ago against the maven-resources plugin:
http://jira.codehaus.org/browse/MRRESOURCES-58
I managed to get down to the root cause that time and prepared a patch, and I
wonder if the two issues are related and a similar approach could fix the
dependency plugin.
> 'tree' goal fails with an NPE if a project uses version ranges for
> dependencies
> -------------------------------------------------------------------------------
>
> Key: MDEP-364
> URL: https://jira.codehaus.org/browse/MDEP-364
> Project: Maven 2.x Dependency Plugin
> Issue Type: Bug
> Components: tree
> Affects Versions: 2.4
> Environment: Apache Maven 3.0.4 (r1232337; 2012-01-17 08:44:56+0000)
> Maven home: /opt/app/eti/tools/apache-maven-3.0.4
> Java version: 1.6.0_15, vendor: Sun Microsystems Inc.
> Default locale: en_US, platform encoding: ANSI_X3.4-1968
> OS name: "linux", version: "2.6.9-42.0.8.elsmp", arch: "amd64", family: "unix"
> Reporter: Sergei Ivanov
>
> We have bound execution of _dependency:tree_ to the _verify_ phase in the
> parent POM for all of our projects. That way, maven always dumps a complete
> tree of dependencies for a project after it's been fully packaged and before
> it's installed/deployed.
> The plugin set-up looks like this:
> {code:lang=xml}
> <plugin>
> <inherited>true</inherited>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-dependency-plugin</artifactId>
> <version>2.4</version>
> <executions>
> <execution>
> <!-- Output dependency tree at the end of build process -->
> <id>display-dependency-tree</id>
> <phase>verify</phase>
> <goals>
> <goal>tree</goal>
> </goals>
> </execution>
> </executions>
> </plugin>
> {code}
> Today it failed sporadically with an NPE during a routine CI build in Jenkins.
> Maven options for Jenkins:
> {noformat}-B --settings /home/xxxxxxxx/.m2/settings-jenkins-releases.xml -U
> clean verify{noformat}
> The stack trace is below:
> {noformat}
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-dependency-plugin:2.4:tree
> (display-dependency-tree) on project liquidity-common-server: Execution
> display-dependency-tree of goal
> org.apache.maven.plugins:maven-dependency-plugin:2.4:tree failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
> 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:84)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
> at
> org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
> at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:158)
> at hudson.maven.Maven3Builder.call(Maven3Builder.java:98)
> at hudson.maven.Maven3Builder.call(Maven3Builder.java:64)
> at hudson.remoting.UserRequest.perform(UserRequest.java:118)
> at hudson.remoting.UserRequest.perform(UserRequest.java:48)
> at hudson.remoting.Request$2.run(Request.java:287)
> at
> hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> display-dependency-tree of goal
> org.apache.maven.plugins:maven-dependency-plugin:2.4:tree failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> ... 27 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.artifact.DefaultArtifact.equals(DefaultArtifact.java:344)
> at
> org.apache.maven.shared.dependency.tree.DependencyNode.equals(DependencyNode.java:811)
> at
> org.apache.maven.shared.dependency.tree.filter.AncestorOrSelfDependencyNodeFilter.isAncestorOrSelf(AncestorOrSelfDependencyNodeFilter.java:103)
> at
> org.apache.maven.shared.dependency.tree.filter.AncestorOrSelfDependencyNodeFilter.accept(AncestorOrSelfDependencyNodeFilter.java:76)
> at
> org.apache.maven.shared.dependency.tree.traversal.FilteringDependencyNodeVisitor.visit(FilteringDependencyNodeVisitor.java:72)
> at
> org.apache.maven.shared.dependency.tree.DependencyNode.accept(DependencyNode.java:305)
> at
> org.apache.maven.shared.dependency.tree.DependencyNode.accept(DependencyNode.java:313)
> at
> org.apache.maven.shared.dependency.tree.DependencyNode.accept(DependencyNode.java:313)
> at
> org.apache.maven.plugin.dependency.TreeMojo.serializeDependencyTree(TreeMojo.java:376)
> at
> org.apache.maven.plugin.dependency.TreeMojo.execute(TreeMojo.java:277)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
> ... 28 more
> {noformat}
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