“Invalid signature file” when attempting to run a .jar

Question

My java program is packaged in a jar file and makes use of an external jar library, bouncy castle. My code compiles fine, but running the jar leads to the following error:

Answer 1

If you're getting this when trying to bind JAR files for a Xamarin.Android bindings project like so:

JARTOXML : warning J2XA006: missing class error was raised while reflecting com.your.class : Invalid signature file digest for Manifest main attributes

Just open the JAR files using Winzip and delete the meta-inf directories. Rebuild - job done