“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

I had this problem when using IntelliJ IDEA 14.01.

I was able to fix it by:

File->Project Structure->Add New (Artifacts)->jar->From Modules With Dependencies on the Create Jar From Module Window:

Select you main class

JAR File from Libraries Select copy to the output directory and link via manifest