[ http://jira.codehaus.org/browse/MANTRUN-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=152990#action_152990 ]

Anders Li commented on MANTRUN-51:
----------------------------------

Using "classpathref" of taskdef to specify the classpath in which your ant task is.

   <plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <executions>
      <execution>
       <id>JPA Enhance</id>
       <phase>process-classes</phase>
       <configuration>
        <tasks>
          <!-- "classpathref" will make the 'ANT' task found when launching this project build from parent module. -->
          <taskdef name="openjpac" classname="org.apache.openjpa.ant.PCEnhancerTask" classpathref="maven.compile.classpath"/>
         
          <openjpac addDefaultConstructor="true" enforcePropertyRestrictions="true" tmpClassLoader="false">
           <classpath refid="maven.compile.classpath"/>
           <fileset dir="./src/main/java">
            <include name="**/authentication/db/*.java"/>
           </fileset>
           <config propertiesFile="./src/main/resources/META-INF/openjpa.xml"/>
          </openjpac>
        </tasks>
       </configuration>
       <goals>
        <goal>run</goal>
       </goals>
      </execution>
    </executions>
   </plugin>

> Problems with multiple antrun declarations in multiproject
> ----------------------------------------------------------
>
>           Key: MANTRUN-51
>           URL: http://jira.codehaus.org/browse/MANTRUN-51
>         Project: Maven 2.x Antrun Plugin
>       Issue Type: Bug
>   Affects Versions: 1.0, 1.1
>      Environment: maven 2.0.4, antrun 1.0 & 1.1, jdk 1.5.0_06, windows xp
>        Reporter: Fredrik Vraalsen
>
> I'm using antrun in my project to create an IzPack installation. The plugin configuration is below.
> When maven is run from the top-level project, the ant taskdef fails because it cannot find the IzPackTask class. However, when I run maven from the subproject itself, it works fine. Not sure if this is related to http://jira.codehaus.org/browse/MANTRUN-49. The error message from maven is at the bottom.
> {noformat}
> <plugin>
>  <groupId>org.apache.maven.plugins</groupId>
>  <artifactId>maven-antrun-plugin</artifactId>
>  <executions>
>    <execution>
>      <phase>package</phase>
>      <configuration>
>        <tasks>
>          <taskdef name="izpack" classname="com.izforge.izpack.ant.IzPackTask"/>
>          <izpack input="${project.build.directory}/classes/izPack.xml" output="${project.build.directory}/CorasTool-${coras.version}-installer.jar" basedir="${project.build.directory}"/>
>        </tasks>
>      </configuration>
>      <goals>
>        <goal>run</goal>
>      </goals>
>    </execution>
>  </executions>
>  <dependencies>
>    <dependency>
>      <groupId>izpack</groupId>
>      <artifactId>standalone-compiler</artifactId>
>      <version>3.8.0</version>
>    </dependency>
>  </dependencies>
> </plugin>
> [INFO] [antrun:run {execution: default}]
> [INFO] Executing tasks
> [INFO] ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO] ------------------------------------------------------------------------
> [INFO] Error executing ant tasks
> Embedded error: taskdef class com.izforge.izpack.ant.IzPackTask cannot be found
> [INFO] ------------------------------------------------------------------------
> [INFO] Trace
> org.apache.maven.lifecycle.LifecycleExecutionException: Error executing ant tasks
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals (DefaultLifecycleExecutor.java:559)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle (DefaultLifecycleExecutor.java:475)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal (DefaultLifecycleExecutor.java:454)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures (DefaultLifecycleExecutor.java:306)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments (DefaultLifecycleExecutor.java:273)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute (DefaultLifecycleExecutor.java:140)
>      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:322)
>      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:115)
>      at org.apache.maven.cli.MavenCli.main (MavenCli.java:256)
>      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:585)
>      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)
> Caused by: org.apache.maven.plugin.MojoExecutionException: Error executing ant tasks
>      at org.apache.maven.plugin.antrun.AbstractAntMojo.executeTasks(AbstractAntMojo.java:77)
>      at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:72)
>      at org.apache.maven.plugin.DefaultPluginManager.executeMojo (DefaultPluginManager.java:412)
>      at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals (DefaultLifecycleExecutor.java:534)
>      ... 16 more
> Caused by: taskdef class com.izforge.izpack.ant.IzPackTask cannot be found
>      at org.apache.tools.ant.taskdefs.Definer.addDefinition (Definer.java:483)
>      at org.apache.tools.ant.taskdefs.Definer.execute (Definer.java:183)
>      at org.apache.tools.ant.UnknownElement.execute (UnknownElement.java:275)
>      at org.apache.tools.ant.Task.perform (Task.java:364)
>      at org.apache.tools.ant.Target.execute (Target.java:341)
>      at org.apache.maven.plugin.antrun.AbstractAntMojo.executeTasks(AbstractAntMojo.java:71)
>      ... 19 more
> Caused by: java.lang.ClassNotFoundException: com.izforge.izpack.ant.IzPackTask
>      at org.apache.tools.ant.AntClassLoader.findClassInComponents (AntClassLoader.java:1166)
>      at org.apache.tools.ant.AntClassLoader.findClass (AntClassLoader.java:1107)
>      at org.apache.tools.ant.AntClassLoader.loadClass (AntClassLoader.java:977)
>      at java.lang.ClassLoader.loadClass (ClassLoader.java:251)
>      at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:319)
>      at java.lang.Class.forName0(Native Method)
>      at java.lang.Class.forName (Class.java:242)
>      at org.apache.tools.ant.taskdefs.Definer.addDefinition (Definer.java:457)
>      ... 24 more
> {noformat}

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