Hint: writing this teeny program is trickly. I wrote it using command-line tools, relying on the correct setting of my classpath. I supply a NetBeans project for you to complete. In it you'll find all ...

With the traditional classpath approach of instructing an application to load classes from JARs, the JAR file containing the .class file needs to end with the .jar extension.

The correct version of the JAR shows up Java Dependencies Pane but when executed a different version is added to the -cp arguments. Environment Operating System: OSX JDK version: 1.8.0_201 Visual ...

alternatively, you can add the api jar in its entirety to the classpath when running the jar. The api jar can be found at xyz.wagyourtail.jvmdowngrader:jvmdowngrader-java-api:0.9.0:downgraded-8 there ...

Just add something like:<BR>Class-Path: images<BR>to the MANIFEST.MF and put it back into the jar.<BR>Now when you run it using java -jar myprogram.jar the classpath will contain myprogram.jar and ...