Patch to fix the bug.
--- a/build.xml
+++ b/build.xml
@@ -101,7 +101,7 @@
<target name="jar" description="o Create the jar" depends="compile">
<jar jarfile="target/${final.name.api}.jar" includes="org/apache/commons/attributes/*,LICENSE.txt,NOTICE.txt,manifest.mf" basedir="${classesdir}" manifest="api/manifest.mf">
</jar>
- <jar jarfile="target/${final.name.compiler}.jar" excludes="org/apache/commons/attributes/*,manifest.mf" includes="**/*" basedir="${classesdir}" manifest="compiler/manifest.mf">
+ <jar jarfile="target/${final.name.compiler}.jar" excludes="org/apache/commons/attributes/*.class,manifest.mf" includes="**/*" basedir="${classesdir}" manifest="compiler/manifest.mf">
</jar>
<jar jarfile="target/${final.name.plugin}.jar" includes="**/*" excludes="manifest.mf" basedir="${plugindir}" manifest="${plugindir}/manifest.mf">
</jar>
