[MNG-3372] dependency:tree throws exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 2.0.8
• Component/s: Artifacts and Repositories
• Assignee: Brian E Fox
• Reporter: Simon Kitching
• Created: 16/Jan/08 09:01
• Updated: 08/Feb/20 15:41
• Resolved: 05/Mar/08 19:30

Description

Running
mvn -Papache org.apache.maven.plugins:maven-dependency-plugin:2.0-alpha-5-SNAPSHOT:tree
on a pom containing the following entry throws an exception, unless an exclusion is applied as shown below.

<dependency>
<groupId>jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>2.0.0</version>
<scope>compile</scope>
<exclusions>
<!-- This exclusion needed to avoid crash in dependency:tree version 2.0-alpha-5-SNAPSHOT -->
<exclusion>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
</exclusion>
<exclusion>
<groupId>xml-apis</groupId>
<artifactId>xml-apis</artifactId>
</exclusion>
<exclusion>
<groupId>eclipse</groupId>
<artifactId>jdtcore</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
<version>1.8</version>
<scope>compile</scope>
</dependency>

Exception:

[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] version was null for commons-digester:commons-digester
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException: version was null for commons-digester:commons-digester
at org.apache.maven.artifact.DefaultArtifact.getBaseVersion(DefaultArtifact.java:362)
at org.apache.maven.artifact.DefaultArtifact.getId(DefaultArtifact.java:225)
at org.apache.maven.shared.dependency.tree.DependencyTreeResolutionListener.flushDependencyManagement(DependencyTreeResolutionListener.java:524)
at org.apache.maven.shared.dependency.tree.DependencyTreeResolutionListener.omitForNearer(DependencyTreeResolutionListener.java:209)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.fireEvent(DefaultArtifactCollector.java:487)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.fireEvent(DefaultArtifactCollector.java:462)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:234)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:370)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:370)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.collect(DefaultArtifactCollector.java:76)
at org.apache.maven.shared.dependency.tree.DefaultDependencyTreeBuilder.buildDependencyTree(DefaultDependencyTreeBuilder.java:102)
at org.apache.maven.plugin.dependency.TreeMojo.execute(TreeMojo.java:218)

My uneducated guess is that for that particular version of the dependency, neither the dependency's pom nor any parent pom defines a version for commons-digester.

PS: dependency:tree rocks!

Issue Links

• duplicates: MNG-2928 Null pointer exeception when introducing version range [major.minor.build-SNAPSHOT,)