The following target doesn't work:
Code:
    <target name="hibernate_to_java"
       description="Generate .java from .hbm files."
       depends="hibernate-acer-tl_anagrafica_audit"
       >
    <taskdef name="hbm2java"
        classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"
        classpathref="lib.class.path"/>
       <hbm2java config="${config.dir}/hbm2java.xml"
          output="${java.export.dir}"
       >
          <fileset dir="${xml.export.dir}">
               <include name="**/*.hbm.xml"/>
          </fileset>
      </hbm2java>
   </target>
and causes the following error:
Code:
C:\java\hibernate_generator\build.xml:237: Caused by:
Caused by:
java.lang.NoClassDefFoundError: net/sf/hibernate/MappingException
        at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.java:145)
        at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java:95)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:302)
        at org.apache.tools.ant.Task.perform(Task.java:401)
        at org.apache.tools.ant.Target.execute(Target.java:338)
        at org.apache.tools.ant.Target.performTasks(Target.java:365)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1094)
        at org.apache.tools.ant.Main.runBuild(Main.java:669)
        at org.apache.tools.ant.Main.startAnt(Main.java:220)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
        at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.java:149)
        at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java:95)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:302)
        at org.apache.tools.ant.Task.perform(Task.java:401)
        at org.apache.tools.ant.Target.execute(Target.java:338)
        at org.apache.tools.ant.Target.performTasks(Target.java:365)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1094)
        at org.apache.tools.ant.Main.runBuild(Main.java:669)
        at org.apache.tools.ant.Main.startAnt(Main.java:220)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
but the following target works perfectly !
Both target are from the same build.xml file and have the same classpathref set to ${lib.class.path}.
I'm stuck! 
Of course I don't want to list all the xml mapping files and I'd like to use Ant's fileset feature with Hbm2JavaTask.
Code:
   <target name="alt-hbm2java" description="Generate ValueObject From Mapping Files">
      <java classname="net.sf.hibernate.tool.hbm2java.CodeGenerator" classpathref="lib.class.path">
         <arg value="--output=${java.export.dir}"/>
         <arg value="${xml.export.dir}\it\tlasf\db\audit\hibernate\model\Action.hbm.xml"/>
      </java>
   </target>
Please help me.
Thanks in advance.