Re: [docbook-apps] Epub3 - epubcheck failing becase "Mimetype entry must not have an extra field in its ZIP header"

[Christian Roth <roth@visualclick.de>]

Hi,

> It's quite a long time since I last tried out my docbook epub3 generation and on doing so now I am getting an error "Mimetype entry must not have an extra field in its ZIP header" from epubcheck (3.0.1).  Does anyone know how to get rid of it ?

I once had this as well and the cause was a certain version of an Open JDK 8 VM. When I reverted to Java 7, the problem vanished. This was on OS X.

I don't know if it's the same issue with you, but i guess it's worth checking which Java VM you are using and/or trying a different one.

Another idea would be to bypass Java's ZIP libraries and instead use the zip binary of your OS (i.e. executing a commandline tool instead of using the Ant task).

Regards
Christian