SAPJCo3 JCoServer restart error

Question

Hello All,
I happened an error when I want to restart my JCoServer.
I used the SAPJCo3's sample code StepByStepServer.java. After I set the connection properties into the connectPorperties object. then I used step3SimpleTRfcServer() method to start JCoServer thread. After that I write a snippet code:
try {
                Thread.sleep(1000);
     } catch (InterruptedException e) {
     e.printStackTrace();
     server.stop();
     while(server.getState() != JCoServerState.STOPPED){
      try {
     Thread.sleep(1000);
     System.out.println("Stopping the server");
           } catch (InterruptedException e) {
     e.printStackTrace();
       server.release();
       server.removeThroughput();
Later on, I used step2SimpleServer() method to restart the JCoServer. but I happen an error:
Exception in thread "main" java.lang.NullPointerException
     at java.util.Hashtable.get(Hashtable.java:336)
     at com.sap.conn.jco.rt.DefaultServerManager.addServer(DefaultServerManager.java:130)
     at com.sap.conn.jco.rt.DefaultServer.addListener(DefaultServer.java:251)
     at com.sap.conn.jco.rt.DefaultServer.start(DefaultServer.java:609)
     at com.sap.conn.jco.rt.DefaultServer.start(DefaultServer.java:596)
     at StepByStepServer.step2SimpleServer(StepByStepServer.java:175)
     at StepByStepServer.main(StepByStepServer.java:311)
Because I can't read the source code of JCo3, I don't know how to restart the JCoServer.
Could everybody pleased tell me how to solve the issue
Edited by: Augustus Octavianus on Feb 27, 2009 4:06 AM
Edited by: Augustus Octavianus on Feb 27, 2009 4:16 AM
Edited by: Augustus Octavianus on Feb 27, 2009 4:16 AM

Answer 1

I am also using JCo 3.0. I have a swing application in which clicking on a start button should start the listener and clicking on stop button should stop the listener.
In connection parameters, server name is given as "SERVER" and Destination name as "BCE". In the class there is a static int variable which will be incremented on listener start and will be appended to server name and destination name. Hence server name will be "SERVER1", "SERVER2",.. and destination name will be "BCE1", "BCE2",...
I am not sure whether it is the right solution. But it works.