Thanks everyone for the help. I think my setup is the same as Richard posted it.
I now tried Java 7 as well as Java 8 but I get the same error. I'm using Ant version 1.9.2 is case that is relevant.
Best regards, Lars
2014-02-18 13:14 GMT+01:00 Christian Roth <>:
Hi,
Maybe the cause for the issue is the filesystem used to create the zip-file, because filesystems other than EFS add the additional metadata, which raises the validation error "Extra field length for first filename must be 0, but was 20".
I don't know if this info applies or is relevant, but I am/was getting this error when running Java's ZIP implementation in Java 8 (dev) on Mac OS X (openjdk 8) for building my EPUB.
When I switched back to Java 7 (u40 and later, openjdk 7 Mac), the error simply went away with no code changes on my part whatsoever.
I tried to trace the code in openjdk 8 Mac in trying to pinpoint the issue so that I could report it to the openjdk 8 Java folks, but it turned out to be way over my head. In my Java code, I am not setting any data in the extra field of a new ZipEntry for the mimetype file, so I do think that it's a bug in Java 8 ZIP utils library when as a result, the extra field length is NOT zero.
Lars, what Java version on which platform are you running Ant in?
Regards
Christian
