added debug output to RMI client

VerteilteSysteme-Examples/src/verteiltesysteme/rmi/RMIEchoClient.java

@@ -12,9 +12,19 @@ public class RMIEchoClient {
         String host = (args.length < 1) ? null : args[0];
         try {
             Registry registry = LocateRegistry.getRegistry(host);
+            final String[] boundNames = registry.list();
+            System.out.println(
+               "Names bound to RMI registry at host " + host + " and default TCP port 1099:");
+            for (final String name : boundNames)
+            {
+               System.out.println("\t" + name);
+            }
             RMIEchoInterface stub = (RMIEchoInterface) registry.lookup("RMIEchoInterface");
+            System.out.println("\nStub: " + stub.toString());
+            System.out.println("\nSending request to convert hAlLo to lower case...");
             String response = stub.toLowerCase("hAlLo");
             System.out.println("response: " + response);
+            System.out.println("\nSending request to convert hAlLo to upper case...");
             response = stub.toUpperCase("hAlLo");
             System.out.println("response: " + response);
         } catch (Exception e) {