How to start “main” in a new Java process?

The question is simple How do I start a main method in another java process? Now I do this:

startOptions = new String[] {"java","-jar","serverstart.jar"};
new ProcessBuilder(startOptions).start();

But they asked me not to use external Jar file serverstart. Jar obviously has a main method, but it can call the main method in another process instead of calling it. Jar file?

I was thinking about something like this:

new ProcessBuilder(ServerStart.main(startOptions)).start();

But I don't know if there is such a thing

Cordial greetings,

Solution

Assuming that a new thread and a new class loader are not enough (although I will vote for this solution), I understand that you need to create a unique process and call a main method. In a class, it is not declared as "jar main method" in the manifest file - because you don't have a unique serverstart It's too late

In this case, you can simply call Java -cp $yourclasspath your package. Server start, just as you run any Java application without (or do not want to use) manifest main class