dependency:tree throws exception
--------------------------------
Key: MDEP-134
URL: http://jira.codehaus.org/browse/MDEP-134
Project: Maven 2.x Dependency Plugin
Issue Type: Bug
Components: tree
Affects Versions: 2.0-alpha-5
Reporter: Simon Kitching
Assignee: Brian Fox
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!
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