Exec() starts new process after my program finishes

Question

Hi all,
I have a problem. I must create a subprocess and connect to it with socket.
My process:
0. String command_to_exec_subprocess="java -cp"+cp+" mypackage.MyMainClass "+args;
1. Runtime.getRuntime().exec(command_to_exec_subprocess);
2. socket.connect(new InetSocketAddress("localhost",25000), 3000);
My subprocess:
1. ServerSocket server=new ServerSocket(25000);
     JFrame jf=new JFrame();
     jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
2. Socket client=server.accept();
I use: Windows 7
JVM: 1.6
Problem is that frame popsup after my process finished, socket can never connect to server socket. As far as I know this means that Runtime waits with starting subprocess till my main process ends... Does any one know how to make the process execute just after I use exec command?? I tryed to use ProcessBuilder but when I use it it doesnt even start the subprocess... When i run the command from cmd on windows7 it runs with no problem.
Thx.

Answer 1

Read, understand and apply the suggestions in this article: [When Runtime.exec() wont|http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html].
When you fully implemented the suggestions in there (careful, it's a multi-page article!), then check if your problem still occurs.