Use the Plexus provided collector and cleanup import in features MOJO.

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.1.x@1097046 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/GenerateFeaturesXmlMojo.java b/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/GenerateFeaturesXmlMojo.java
index 02a6b39..a7564e8 100644
--- a/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/GenerateFeaturesXmlMojo.java
+++ b/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/GenerateFeaturesXmlMojo.java
@@ -43,9 +43,9 @@
 import org.apache.maven.artifact.InvalidArtifactRTException;
 import org.apache.maven.artifact.metadata.ArtifactMetadataRetrievalException;
 import org.apache.maven.artifact.metadata.ResolutionGroup;
+import org.apache.maven.artifact.resolver.ArtifactCollector;
 import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
 import org.apache.maven.artifact.resolver.ArtifactResolutionException;
-import org.apache.maven.artifact.resolver.DefaultArtifactCollector;
 import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
@@ -80,6 +80,15 @@
     private DependencyTreeBuilder dependencyTreeBuilder;
 
     /**
+     * The ArtifactCollector provided by Maven at runtime
+     *
+     * @component
+     * @required
+     * @readonly
+     */
+    private ArtifactCollector collector;
+
+    /**
      * The file to generate
      * 
      * @parameter default-value="${project.build.directory}/classes/feature.xml"
@@ -193,7 +202,7 @@
                 return true;
             }
                
-           }, new DefaultArtifactCollector());
+           }, collector);
            tree.accept(new DependencyNodeVisitor() {
                 public boolean endVisit(DependencyNode node) {
                     // we want the next sibling too
diff --git a/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/ValidateFeaturesMojo.java b/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/ValidateFeaturesMojo.java
index d728c1a..e3810e7 100644
--- a/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/ValidateFeaturesMojo.java
+++ b/tooling/features-maven-plugin/src/main/java/org/apache/karaf/tooling/features/ValidateFeaturesMojo.java
@@ -42,14 +42,12 @@
 import org.apache.maven.artifact.resolver.ArtifactCollector;
 import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
 import org.apache.maven.artifact.resolver.ArtifactResolutionException;
-import org.apache.maven.artifact.resolver.DefaultArtifactCollector;
 import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.shared.dependency.tree.DependencyNode;
 import org.apache.maven.shared.dependency.tree.DependencyTreeBuilder;
 import org.apache.maven.shared.dependency.tree.traversal.DependencyNodeVisitor;
-import org.osgi.framework.Constants;
 
 /**
  * Validates a features XML file