How to add empty folder in a jar file ?

Well
I know how to add files in a jar file but I cannot add empty folder.
I would like to do this so that when I get back the jar file I can have all the structure of the save main folder.
I also test that it is possible to do that on line with the "jar" command.
Does any of you know how to do this programacticaly ?
Thanks in advance

     JarOutputStream jos = // ...
     jos.putNextEntry(new JarEntry("directory/"));
     jos.closeEntry();
     jos.finish();
     jos.close();on the command line:
jar -tf <your_jar_file.jar>

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