added debug output to RMI client

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

@@ -1,25 +1,35 @@
-package verteiltesysteme.rmi;
-
-import java.rmi.registry.LocateRegistry;
-import java.rmi.registry.Registry;
-
-public class RMIEchoClient {
-
-    private RMIEchoClient() {}
-
-    public static void main(String[] args) {
-
-        String host = (args.length < 1) ? null : args[0];
-        try {
-            Registry registry = LocateRegistry.getRegistry(host);
-            RMIEchoInterface stub = (RMIEchoInterface) registry.lookup("RMIEchoInterface");
-            String response = stub.toLowerCase("hAlLo");
-            System.out.println("response: " + response);
-            response = stub.toUpperCase("hAlLo");
-            System.out.println("response: " + response);
-        } catch (Exception e) {
-            System.err.println("Client exception: " + e.toString());
-            e.printStackTrace();
-        }
-    }
+package verteiltesysteme.rmi;
+
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+
+public class RMIEchoClient {
+
+    private RMIEchoClient() {}
+
+    public static void main(String[] args) {
+
+        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) {
+            System.err.println("Client exception: " + e.toString());
+            e.printStackTrace();
+        }
+    }
 }