Ionut Barau wrote:As far as i know and also tried, the signature works only for 1 jar
It's hard to tell what that means. Did you try something? What was it? What happened then?
Note that the jars are third party and as far as i know you cannot sign them if it is not permitted by the license.
True, but I think you would have a hard time finding a licence which prevents you from signing the code.