Merge pull request #9 from eugenp/master

update with origin

google-web-toolkit/src/main/java/com/baeldung/shared/MessageService.java

@@ -0,0 +1,12 @@
+package com.baeldung.shared;
+
+import com.google.gwt.user.client.rpc.RemoteService;
+import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
+
+/**
+ * The client-side stub for the RPC service.
+ */
+@RemoteServiceRelativePath("greet")
+public interface MessageService extends RemoteService {
+    String sendMessage(String message) throws IllegalArgumentException;
+}

google-web-toolkit/src/main/java/com/baeldung/shared/MessageServiceAsync.java

@@ -0,0 +1,10 @@
+package com.baeldung.shared;
+
+import com.google.gwt.user.client.rpc.AsyncCallback;
+
+/**
+ * The async counterpart of <code>MessageService</code>.
+ */
+public interface MessageServiceAsync {
+    void sendMessage(String input, AsyncCallback<String> callback) throws IllegalArgumentException;
+}