Any way to get a File object from a JAR

Answer 1

Resources in a .jar file are not files in the sense that the OS can access them directly via normal file access APIs.

And since java.io.File represents exactly that kind of file (i.e. a thing that looks like a file to the OS), it can't be used to refer to anything in a .jar file.

A possible workaround is to extract the resource to a temporary file and refer to that with a File.

Note that generally APIs that try to handle files should be written to handle InputStream/OutputStream as well to allow this kind of operations to suceed.