Can't get from ServletInputStream to ZipInputStream

Here's a problem that's been bothering me:
I'm trying to set up an import program where I submit a .zip file via POST to a servlet.
I can submit the .zip and read its binary data just fine. I can also open a zip file that's on the server and parse it contents via java.util.zip and ZipImputStream.
For some reason though, I can't go from point A to Point B.
// works
FileInputStream fis = new FileInputStream( "_test.zip" );
ZipInputStream zisImportArchive = new ZipInputStream( fis );
// works
ServletInputStream sis = request.getInputStream();
// doesn't work
ZipInputStream zisImportArchive = new ZipInputStream( sis );
I don't get any errors, but out.println( zisImportArchive); always returns "null" when it's made from the ServletInputStream.
Has anyone run into anything like this before?

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Also, see How to Change Your iTunes Store Account Location | eHow.com.

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Can't get from ServletInputStream to ZipInputStream

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