[MDEP-364] 'tree' goal fails with an NPE if a project uses version ranges for dependencies

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 2.4
• Component/s: tree

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"

• Assignee: Unassigned
• Reporter: Sergei S. Ivanov
• Created: 02/Aug/12 04:36
• Updated: 15/Apr/17 23:19
• Resolved: 15/Apr/17 23:19

Description

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:

<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>

Today it failed sporadically with an NPE during a routine CI build in Jenkins.
Maven options for Jenkins:

-B --settings /home/xxxxxxxx/.m2/settings-jenkins-releases.xml -U clean verify

The stack trace is below:

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

Issue Links

• is related to: MDEP-373 dependency:tree sporadically fails to resolve version ranges when bound to lifecycle
• relates to: MRRESOURCES-58 'process' goal fails with NPE at the root of a reactor if child modules use version ranges for dependencies