I propose to add in Configuration class in hibernate :

class Configuration ...
{ ...
public Configuration addPar(File par) throws MappingException
{
 log.info("Searching for mapping documents in par: " + par.getName());
 JarFile parFile = null;
 try
 {
 try
 {
 parFile = new JarFile(par);
 }
 catch (IOException ioe)
 {
 throw new MappingException("Could not read mapping documents from jar: "
 + par.getName(), ioe);
 }
 Enumeration jarEntries = parFile.entries();
 do
 {
 if (!jarEntries.hasMoreElements())
 break;
 ZipEntry ze = (ZipEntry) jarEntries.nextElement();
 if (ze.getName().endsWith(".class"))
 {
 try
 {
 String classname = ze.getName();
 classname = classname.substring(0, classname.length() - 6)
 .replace('/', '.');
 log.info("Found class in jar: " + classname);
 addClass(Class.forName(classname));
 }
 catch (Exception e)
 {
 throw new MappingException(
 "Could not read mapping class from par: " + par.getName(), e);
 }
 }
 } while (true);
 }
 finally
 {
 try
 {
 if (parFile != null)
 parFile.close();
 }
 catch (IOException ioe)
 {
 log.error("could not close jar", ioe);
 }
 }
 return this;
}
...
}