Hi Björn Kautler,

thanks for reporting this.

As for why this error happens - Weld expects a standard JAR when looking for archives whereas in this case it gets IDE-specific "fake" JAR that it apparently cannot read.
Archive discovery is mainly done in AbstractDiscoveryStrategy#performDiscovery(), so that could be a good starting point.

If you would like to contribute to Weld, you are more then welcome. Otherwise, I am switching this from Bug to Feature request with minor priority.