java.io.IOException: Cannot run program "java -Xmx512m -cp /opt/Nils.jar dev.keksstudios.core.Main": error=2, No such file or directory

I've tryied to restart my Java Application with this code:

public static void restartApplication() throws URISyntaxException, IOException {
    final File currentJar = new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI());

    /* is it a jar file? */
    if(!currentJar.getName().endsWith(".jar"))
        return;

    /* Build command: java -jar application.jar */
    final ProcessBuilder builder = new ProcessBuilder("java -Xmx512m -cp /opt/Nils.jar dev.keksstudios.core.Main");
    builder.inheritIO();
    builder.start();

    System.exit(0);
}

When I type the command into my command panel it works totaly fine.
So what is the Error here?
Output

> java.io.IOException: Cannot run program "java -Xmx512m -cp
> /opt/Nils.jar dev.keksstudios.core.Main": error=2, No such file or
> directory

>final ProcessBuilder builder = new ProcessBuilder("java -Xmx512m -cp /opt/Nils.jar dev.keksstudios.core.Main");

This line is false. Java/The OS will look for an executable called java -Xmx512m -cp /opt/Nils.jar dev.keksstudios.core.Main.exe.
You have to separate the arguments like this:

final ProcessBuilder builder = new ProcessBuilder("java", "-Xmx512m" ,"-cp", "/opt/Nils.jar", "dev.keksstudios.core.Main");