ConnectException after a few times of start/stop

Question

I've made a serverUI where I want to start/stop my server. It works to start it, stop it and start it again. But when I then want to stop it I get a ConnectionException. Any ideas?
Here's some code.. (I'm using 1.1.8)
I do this once at startup:
try
     Runtime.getRuntime().exec("rmiregistry");
catch(Exception pException)
     System.out.println(pException);
     pException.printStackTrace();
I do this to start the server:
try
     Runtime.getRuntime().exec("java -classpath .;C:\\jdk1.1.8\\lib\\classes.zip;\\jdk1.1.8\\lib\\comm.jar -Djava.rmi.server.codebase=http://"+InetAddress.getLocalHost().getHostAddress()+":8080 -Djava.security.policy=policy bentrix.solarPower.server.SunControlImpl");
     mServer = (SunControl)Naming.lookup("//"+InetAddress.getLocalHost().getHostAddress()+"/SunControlServer");
catch(Exception pException)
     System.out.println(pException);
     pException.printStackTrace();
I do this to stop the server (with a delay and then System.exit in the server):
try
     mServer.terminate();
catch(Exception pException)
     System.out.println(pException);
     pException.printStackTrace();
I end up with this exception... I've tried putting in delays but that didn't help. I've watched the processes and the first time mServer.terminate() really removes the server. And it works to start the server again. But when a new try to stop the server is made it fails! It does works to connect from the "real" client even now so nothing is wrong with the last start of the server.
java.rmi.ConnectException: Connection refused to host: [212.214.64.210:4134]; nested exception is:
java.net.ConnectException: Connection refused
java.rmi.ConnectException: Connection refused to host: [212.214.64.210:4134]; nested exception is:
java.net.ConnectException: Connection refused
at sun.rmi.transport.tcp.TCPChannel.openSocket(TCPChannel.java:276)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:143)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Compiled Code)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:60)
at bentrix.solarPower.server.SunControlImpl_Stub.terminate(SunControlImpl_Stub.java:845)
at bentrix.solarPower.serverUi.SunControlServerUI.stopServer(Compiled Code)
at bentrix.solarPower.serverUi.SunControlServerUI.actionPerformed(SunControlServerUI.java:211)
at java.awt.Button.processActionEvent(Button.java:249)
at java.awt.Button.processEvent(Button.java:222)
at java.awt.Component.dispatchEventImpl(Compiled Code)
at java.awt.Component.dispatchEvent(Compiled Code)
at java.awt.EventDispatchThread.run(Compiled Code)
Any better way to start/stop the server please let me know!

Answer 1

Oops! I fixed this by doing Naming.unbind() in the server when I shut it down. But I still have to watch very careful in the task manager when I do the start/stop by pressing a button in the serverUI because if I do start before the server has been killed I get the same exception! Is there a good way to know that the process has terminated or do I just have to disable the button for a little while?