Hi, I have finally soleved this problem. You have to remote one sigle line from the Manifest.MF in the abServer.jar file. The new Manifest should read like this:
Manifest-Version: 1.0
Rsrc-Class-Path: ./ json-simple-1.1.1.jar WebSocket.jar commons-codec-
1.7.jar matlabcontrol-4.0.0.jar Jama-1.0.2.jar jar-in-jar-loader.zip
commons-io-2.4.jar
Rsrc-Main-Class: server.ABServer
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader
i.e. it should not contain "Class-Path: ."
Make sure that you include the necesary jars/zips/ libraries in you enviroment variable for CLASS-PATH instead.
Alternative you can as i wrote earlier use a older version of Java, but if you wan to use java 13, the fix above should work.
see:
https://www.oracle.com/technetwork/java ... DK-8211941