ArchiverException when using maven dependency plugin in multi-module projects
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          Key: MNG-3792
          URL: http://jira.codehaus.org/browse/MNG-3792
        Project: Maven 2
      Issue Type: Bug
  Affects Versions: 2.0.8
       Reporter: Sascha Hofer


Having the following module hierarchy the _unpack-dependencies_ goal of the _maven-dependency-plugin_ produces an _ArchiverException_.
* A
** B
** C (depends on B)

I took a quick look into the code and found that when unpacking the dependencies of module *C* the method _unpack(File, File, String, String)_ of class _org.apache.maven.plugin.dependency.AbstractDependencyMojo_ gets passed the *target/classes* directory of *B* as source file (instead of the created jar).

part of the pom.xml which caused the error:
{noformat}
<profile>
<id>multi-module-coverage</id>
<build>
  <plugins>
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
      <execution>
       <id>unpack-dependencies</id>
       <phase>process-classes</phase>
       <goals>
        <goal>unpack-dependencies</goal>
       </goals>
       <configuration>
        <outputDirectory>${project.build.directory}/classes</outputDirectory>
        <excludeClassifiers>tests</excludeClassifiers>
       </configuration>
      </execution>
    </executions>
   </plugin>
  </plugins>
</build>
</profile>
{noformat}

exception:
{noformat}
org.codehaus.plexus.archiver.ArchiverException: The source must not be a directory.
    at org.codehaus.plexus.archiver.AbstractUnArchiver.validate(AbstractUnArchiver.java:174)
    at org.codehaus.plexus.archiver.AbstractUnArchiver.extract(AbstractUnArchiver.java:107)
    at org.apache.maven.plugin.dependency.AbstractDependencyMojo.unpack(AbstractDependencyMojo.java:266)
    at org.apache.maven.plugin.dependency.UnpackDependenciesMojo.execute(UnpackDependenciesMojo.java:90)
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo (DefaultPluginManager.java:447)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals (DefaultLifecycleExecutor.java:539)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle (DefaultLifecycleExecutor.java:480)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal (DefaultLifecycleExecutor.java:459)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures (DefaultLifecycleExecutor.java:311)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments (DefaultLifecycleExecutor.java:278)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute (DefaultLifecycleExecutor.java:143)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:333)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:126)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:282)
    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.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
{noformat}

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