Could not create task or type of type: antlib:org.apache.maven.artifact.ant:pom

[michael-meyer]

Hi,
the attached project produces the following error message:
Could not create task or type of type: antlib:org.apache.maven.artifact.ant:pom.

It's a simple project. The project should only demonstrate my problem.
It seems that maven-plugin-plugin can't find org.apache.... although 
maven-artifact-ant-2.0.x
is on the classpath.
If anybody could please take a look at it?

Cheers, michael


For building and running the attached project execute:
mvn install
mvn org.myproject.plugins:test-plugin:test

File structure:
TestPlugin
|- pom.xml
|- src
    |- main
        |- scripts
            |- test.build.xml
            |- test.mojos.xml


<project>
  <modelVersion>4.0.0</modelVersion>
    
  <groupId>org.myproject.plugins</groupId>
  <artifactId>test-plugin</artifactId>
  <version>1.0-SNAPSHOT</version>
    
  <packaging>maven-plugin</packaging>
  
  <name>Test Plugin</name>
  <build>
    <plugins>
      <plugin>
        <!-- NOTE: We don't need groupId if the plugin's groupId is
             org.apache.maven.plugins OR org.codehaus.mojo.
             We also don't have to specify a version, since Maven can
             automatically resolve the newest one.
        -->
        <artifactId>maven-plugin-plugin</artifactId>
        
        <!-- Add the Ant plugin tools -->
        <dependencies>
          <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-tools-ant</artifactId>
            <version>2.0.1</version>
          </dependency>
        </dependencies>
       
        
        <!-- Tell the plugin-plugin which prefix we will use.
             Later, we'll configure Maven to allow us to invoke this
             plugin using the "prefix:mojo" shorthand.
        -->
        <configuration>
          <goalPrefix>test</goalPrefix>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-artifact-ant</artifactId>
      <version>2.0.3</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-script-ant</artifactId>
      <version>2.0.1</version>
      <scope>runtime</scope>
    </dependency>
  </dependencies>  
</project>

<!-- <project name="test task" xmlns:artifact="urn:maven-artifact-ant">
	
  <typedef resource="org/apache/maven/artifact/ant/antlib.xml" uri="urn:maven-artifact-ant">
    <classpath>
      <pathelement location="c:/maven-artifact-ant-2.0.3-dep.jar" />
    </classpath>
  </typedef> -->

<project name="test task" xmlns:artifact="antlib:org.apache.maven.artifact.ant">

	<!--
		Check that org.apache.maven.artifact.ant.Pom is on the classpath
	-->
	<target name="check.artifact.ant">
    	<available property="artifact.ant.installed"
		classname="org.apache.maven.artifact.ant.Pom"/>
	</target>

	<!--
		Print error message if org.apache... is not on the classpath
	-->
	<target name="guard.noartifact" depends="check.artifact.ant" unless="artifact.ant.installed">
		<fail message="Can't find maven.artifact.ant in the classpath."/>
	</target>
  
	<!-- 
		Here we see, that org.apache.... is on the classpath but 
		artifact:pom still produces an error
	-->
	<target name="test" depends="guard.noartifact">
		<echo>Found org.apache.maven.artifact.ant.Pom on the classpath</echo>
		<artifact:pom id="maven" file="pom.xml" />
		<!-- <property name="build.dir" value="${maven.build.directory}"/> -->
	</target>

</project>

<pluginMetadata>
  <mojos>
    <mojo>
      <goal>test</goal>
        
      <!-- this element refers to the Ant target we'll invoke -->
      <call>test</call>
      <requiresProject>true</requiresProject>
      <description>
        Task that unfortunately fails.
      </description>
    </mojo>
  </mojos>
</pluginMetadata>

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