duplicated entries aren't recreated

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create a jar file (or find one) with duplicated entries
2. expand the jar with rjar
3. recreate the jar with rjar
4. compare the number of entries in the original and recreated jars (using
e.g. jar t / wc)

As you'll see, the duplicate entries in the original jar file are not
recreated. Actually, duplicated entries are "lost" when extracting the
original jar on the file system (same behavior as "jar").

Original issue reported on code.google.com by [email protected] on 28 Jan 2009 at 10:56