Java support of GNU Tar

Hello, I'm having difficulties with writing Java code that unpacks and
repacks tar.gz files. I'm really stuck and would appreciate some
help.

I've got the code running using the http://www.trustice.com/java/tar/
library. It is able to uncompress and unpack the tarred gzip file, do
the work the code is supposted to do and unpack and recompress it
suggessfully. However it fails on certain files.

The problem that it reports is that the file name is too long,
exceeding 100 characters. I did a little research and found that GNU
tar supports longer file names but other implementations don't.

After a little more research I found that there is at least one GNU
tar implementation in Java, made by the Apache Ant team. In fact it's
derived from the package I'm already using, so I was hopeful that I
could just drop in their version. This didn't work and I'm not sure
why.

The error I get occurs when I am trying to repack the files into a
Tar. The relevant part of the stack trace is:

java.io.IOException: request to write '7608' bytes exceeds size in
header of '0' bytes
at org.apache.tools.tar.TarOutputStream.write(TarOutputStream.java:
235)
at utilities.ArchiveFormatter.packGZip(ArchiveFormatter.java:324)

Has anyone ever tried to use the Apache code for their own code or
have any idea why I would get the exception above?

.

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