derived.addFile(new File(outputdir, "Product.hbm.xml") );
derived.addFile(new File(outputdir, "Customer.hbm.xml") );
derived.addFile(new File(outputdir, "Lineitem.hbm.xml") );
derived.addFile(new File(outputdir, "Customerorder.hbm.xml") );
derived.buildMappings();
/*assertNotNull(derived.getClassMapping("org.reveng.Child") );
assertNotNull(derived.getClassMapping("org.reveng.Master") );*/
URL[] urls = new URL[] { outputdir.toURL() };
URLClassLoader ucl = new URLClassLoader(urls, Thread.currentThread().getContextClassLoader() );