Found the solution. The problem was in my enhance.xml. I included the build
path twice. Deleted the second path declaration in xml File. And now the
Warning (No metadata was found for 1 classes) is gone. Here my new
enhance.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project name="testJSF">
<path id="jpa.enhancement.classpath">
<pathelement location="build"/>
<pathelement location="${basedir}/build/classes"/>
<fileset dir="lib">
<include name="**/*.jar"/>
</fileset>
</path>
<target name="enhance">
<taskdef name="openjpac"
classname="org.apache.openjpa.ant.PCEnhancerTask">
<classpath refid="jpa.enhancement.classpath"/>
</taskdef>
<openjpac>
<config propertiesFile="src/META-INF/persistence.xml" />
<classpath refid="jpa.enhancement.classpath"/>
</openjpac>
<echo message="Enhancing complete."/>
</target>
</project>
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