How do I list all classes in a Jar file?

Its no problem if the jar file contains classes, but I have an EAR file, which contains a jar-file, and I want to list all classes in that jar-file.
I would like to do something like this:
java.util.jar.JarFile jarfile = new java.util.jar.JarFile( new File("/meYear.ear"), true );
java.util.jar.JarEntry jar = jarfile.getJarEntry( "myJar.jar" );
// Cast it to a new JarFile:
java.util.jar.JarFile newJar = (java.util.jar.JarFile)jar;
But the method getEntry returns something like jarFile$JarEntry, if I try to class cast it I get an classCastException.

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=============================================
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How do I list all classes in a Jar file?

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