I've spent the better part of today playing with this, and researching it... There doesnt seem to be a resolution, just that java's zipinputstream cant read non-standard zips. This is actually a pretty good site and info: http://mindprod.com/jgloss/zip.html Of course... The following code won't work if ZipOutputStream was used to create the zip file. ZipEntry.getSize will return -1. So even thought you can change things to use a tempFile and use ZipFile, you still have to do: while (entries.hasMoreElements()) | { | zipEntry = (ZipEntry)entries.nextElement(); | String itemName = zipEntry.getName(); | if (!zipEntry.isDirectory()) | { | long fileSize = zipEntry.getSize(); | Its the only way to read the file items, is to getSize, but if it returns -1, then we die again. So even using zipFile wont work. I'll attach the changed I made to the jira, but for now, am adding some exception handling, as I dont see a workaround at all here. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991048#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...