(Hi Mike, thank you for your help for my configuration problem!) Now I met the 
next problem. I want to enhance the entities using the task 
'org.apache.openjpa.ant.PCEnhancerTask' in eclipse. After consulting the web I 
successed writing a build file as follows:

******************************************
<?xml version="1.0" ?>
<project name="OpenJPA Entity Enhancer" default="enhance" basedir=".">
  <target name="enhance">
    <taskdef name="openjpac" 
             classname="org.apache.openjpa.ant.PCEnhancerTask"/>
    <openjpac directory=".">
      <config propertiesFile="META-INF/persistence.xml"/>               
      <fileset dir="bin">
        <include name="**/tables/BasicTable.class" />
        <include name="**/tables/User.class" />
      </fileset>
    </openjpac>
  </target>
</project>
******************************************

My environment looks like this (omitting some further dirs and files):

******************************************
root/
  bin/   compiled classes
  src/   sources
  lib/   used libraries
  META-INF/ containing persistence.xml, orm.xml and xsd's
  build.xml
******************************************

The persistence.xml, orm.xml User.java and BasicTable.java files are the same 
as the last time, I did not change anything.
  
Now I get the following error when trying to run the ant task:

******************************************
Buildfile: C:\Projekte\Eclipse 3.x\ColibriTS\ch.eugster.colibri.core\build.xml
enhance:
 [openjpac] java.lang.IllegalArgumentException: 
java.lang.ClassNotFoundException: ch.eugster.colibri.core.db.tables.BasicTable
 [openjpac]     at serp.util.Strings.toClass(Strings.java:164)
 [openjpac]     at serp.util.Strings.toClass(Strings.java:108)
 [openjpac]     at 
org.apache.openjpa.lib.meta.ClassArgParser.parseTypes(ClassArgParser.java:164)
 [openjpac]     at 
org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4328)
 [openjpac]     at 
org.apache.openjpa.ant.PCEnhancerTask.executeOn(PCEnhancerTask.java:89)
 [openjpac]     at 
org.apache.openjpa.lib.ant.AbstractTask.execute(AbstractTask.java:172)
 [openjpac]     at 
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
 [openjpac]     at org.apache.tools.ant.Task.perform(Task.java:364)
 [openjpac]     at org.apache.tools.ant.Target.execute(Target.java:341)
 [openjpac]     at org.apache.tools.ant.Target.performTasks(Target.java:369)
 [openjpac]     at 
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
 [openjpac]     at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
 [openjpac]     at 
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
 [openjpac]     at 
org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
 [openjpac]     at 
org.apache.tools.ant.Project.executeTargets(Project.java:1068)
 [openjpac]     at 
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
 [openjpac]     at 
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)

BUILD FAILED
C:\Projekte\Eclipse 3.x\ColibriTS\ch.eugster.colibri.core\build.xml:11: 
java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: 
ch.eugster.colibri.core.db.tables.BasicTable

Total time: 1 second
******************************************

I searched the web finding some information trying all out but did not succeed. 
Do you have any hint? Thank you in advance!

Christian
-- 
****************************
Christian Eugster
Grissian Widum 14
I-39010 Tisens
--------------------------------------
Handy Schweiz: 0041 79 594 85 45
Handy Italia: 0039 333 888 77 64
Email: [EMAIL PROTECTED]


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