There seems to be some support for application args in parseArgs():

            if (classNameParsed) {
                // once classname is read, treat any other arguments as app arguments
                argInfo.targetAppCommandLine += (arg + ' ');
                continue;
            }

But before we get to parseArgs(), we have startup() adding the debuggee class name last.

    protected void startUp(String targetName) {
        List<String> argList = new ArrayList(Arrays.asList(args));
        argList.add(targetName);
        println("run args: " + argList);
        connect(argList.toArray(args));
        waitForVMStart();
    }

It's assuming args[] only contains VM arguments. So that means what is suppose to be the first application argument ends up being taken as the class name by parseArgs(). I think startUp() needs to do something similar to parseArgs() and find the first argument that doesn't start with a '-', and insert targetName at that point.

I need this support for a new test case I am writing for JDK-8308237.