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This graphic is explained in the accompanying text Exception Listener Locate the document in its SAP Library structure

Whenever errors occur, JCo throws an exception. All exceptions that occur in JCo are passed on to the registered Exception and Error Listener.

Note

The application must process the exceptions separately in the method handleRequest()(that is, the exceptions that it generates itself). Exceptions from the application coding are not passed on to the Listener.

To define a Listener, create a class that implements the JCO.ServerExceptionListener and JCO.ServerStateChangedListener:

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public class MyExceptionAndErrorListener

implements JCO.ServerExceptionListener, JCO.ServerErrorListener {

 

  public void serverExceptionOccurred(JCO.Server server, Exception ex)

  {

    System.out.println("Exception in server " + server.getProgID() + ":\n" + ex);

    ex.printStackTrace();

  }

  public void serverErrorOccurred(JCO.Server server, Error er)

  {

    System.out.println("Error in server " + server.getProgID() + ":\n" + er);

    er.printStackTrace();

  }

}

Register the Listener class with JCO.addServerErrorListener and JCO.addServerExceptionListener:

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public class SecondExample extends FirstExample {

    public static void main(String[] args) {

        MyExceptionAndErrorListener l = new MyExceptionAndErrorListener();

        JCO.addServerErrorListener(l);

        JCO.addServerExceptionListener(l);

        FirstExample.startServers() ;

    }

}

 

 

 

 

 

 

 

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