[MSHARED-80] NullPointer in DefaultDependencyTreeBuilder.java:93, no logger

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Not A Problem
• Affects Version/s: maven-dependency-tree-1.2
• Component/s: maven-dependency-tree
• Environment: Windows XP 64 JDK 1.6
• Assignee: Mark Hobson
• Reporter: Mark Hobson
• Created: 04/Nov/08 17:32
• Updated: 08/Feb/20 15:41
• Resolved: 08/May/11 03:34

Description

I have a report and a mojo that seeks transversal dependencies. It shows a nullpointer in the DefaultDependencyTreeBuilder.
I can not figure it out what is wrong sice the implementation off DependencyTreeBuilder is assigned by Maven and I have no controll on the logger.

Here is the code snippet

//members
	/**
	 * Used to look up Artifacts in the remote repository.
	 * 
	 * @parameter expression=
	 *            "${component.org.apache.maven.artifact.factory.ArtifactFactory}"
	 * @required
	 * @readonly
	 */
	protected org.apache.maven.artifact.factory.ArtifactFactory artifactFactory;

	/**
	 * Used to look up Artifacts in the remote repository.
	 * 
	 * @parameter expression=
	 *            "${component.org.apache.maven.artifact.resolver.ArtifactResolver}"
	 * @required
	 * @readonly
	 */
	protected org.apache.maven.artifact.resolver.ArtifactResolver resolver;

	/**
	 * Artifact collector, needed to resolve dependencies.
	 * 
	 * @component role="org.apache.maven.artifact.resolver.ArtifactCollector"
	 * @required
	 * @readonly
	 */
	protected ArtifactCollector artifactCollector;

	/**
	 * @component 
	 *            role="org.apache.maven.artifact.metadata.ArtifactMetadataSource"
	 *            hint="maven"
	 * @required
	 * @readonly
	 */
	protected ArtifactMetadataSource artifactMetadataSource;
	/**
	 * Dependency tree builder component.
	 * 
	 * @component expression=
	 *            "org.apache.maven.shared.dependency.tree.DependencyTreeBuilder"
	 * @required
	 * @readonly
	 */
	private DependencyTreeBuilder dependencyTreeBuilder;


//sample snippet to use in report and mojo

		ArtifactFilter artifactFilter = new ScopeArtifactFilter(
				Artifact.SCOPE_COMPILE);

		DependencyNode dn;
		getLog().info("Start");
		try {
			dn = dependencyTreeBuilder.buildDependencyTree(
					project, localRepository, artifactFactory, artifactMetadataSource,
					artifactFilter, artifactCollector);
			
		} catch (DependencyTreeBuilderException e) {
			e.printStackTrace();
			getLog().error("oeps",e);
		}
		getLog().info("Done");