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POGWT Simple RPC use case problem : Code included
 

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    <p>I am trying to work out how to send a domain object from the server-side to the client-side using GWT RPC. I've coded a really simple use case that represents the sort of thing I (and others?) need to be able to do but presently can't get to work.</p> <p>I have scoured the docs, tutorials and forums but they either show Strings being passed around or offer explanations that (when I apply them to this) still don't work.</p> <p>Hopefully someone can explain to me and others why this code doesn't work and how to get it to work.</p> <p>Thank you.</p> <p>Here are the error messages.</p> <pre><code>13:12:54.328 [DEBUG] [org.redboffin.worldhug.Test] Validating newly compiled units 13:12:54.328 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestService.java' 13:12:54.343 [ERROR] [org.redboffin.worldhug.Test] Line 14: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module? 13:12:54.515 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestServiceAsync.java' 13:12:54.515 [ERROR] [org.redboffin.worldhug.Test] Line 12: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module? 13:12:55.953 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestView.java' 13:12:55.968 [ERROR] [org.redboffin.worldhug.Test] Line 42: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module? 13:12:55.968 [ERROR] [org.redboffin.worldhug.Test] Line 46: No source code is available for type org.redboffin.worldhug.server.test.InnerObject; did you forget to inherit a required module? 13:12:55.984 [ERROR] [org.redboffin.worldhug.Test] Line 48: No source code is available for type org.redboffin.worldhug.server.test.ListObject; did you forget to inherit a required module? 13:12:56.765 [INFO] [org.redboffin.worldhug.Test] Module org.redboffin.worldhug.Test has been loaded </code></pre> <p>Here are the project classes and files.</p> <p>Test.gwt.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.0.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/2.0.0/distro-source/core/src/gwt-module.dtd"&gt; &lt;module&gt; &lt;inherits name="com.google.gwt.user.User" /&gt; &lt;source path="client/test" /&gt; &lt;entry-point class="org.redboffin.worldhug.client.test.Test"&gt;&lt;/entry-point&gt; &lt;/module&gt; </code></pre> <p>Web.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"&gt; &lt;web-app&gt; &lt;!-- Servlets --&gt; &lt;servlet&gt; &lt;servlet-name&gt;testServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;org.redboffin.worldhug.server.test.TestServiceImpl&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;testServlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/worldhug/test/testService&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;!-- Default page to serve --&gt; &lt;welcome-file-list&gt; &lt;welcome-file&gt;test.html&lt;/welcome-file&gt; &lt;/welcome-file-list&gt; &lt;/web-app&gt; </code></pre> <p>TestObject.java</p> <pre><code>package org.redboffin.worldhug.server.test; import java.util.ArrayList; import java.util.List; import com.google.gwt.user.client.rpc.IsSerializable; public class TestObject implements IsSerializable { private String testObjectString; private InnerObject innerObject; private List&lt;ListObject&gt; listObjects = new ArrayList&lt;ListObject&gt;(); public TestObject() {} // Getters and setters removed for brevity } </code></pre> <p>InnerObject.java</p> <pre><code>package org.redboffin.worldhug.server.test; import com.google.gwt.user.client.rpc.IsSerializable; public class InnerObject implements IsSerializable { private String innerObjectString; public InnerObject() {} // Getters and setters removed for brevity } </code></pre> <p>ListObject.java</p> <pre><code>package org.redboffin.worldhug.server.test; import com.google.gwt.user.client.rpc.IsSerializable; public class ListObject implements IsSerializable { private String listObjectString; public ListObject() {} // Getters and setters removed for brevity. } </code></pre> <p>TestService.java</p> <pre><code>package org.redboffin.worldhug.client.test; import org.redboffin.worldhug.server.test.TestObject; import com.google.gwt.user.client.rpc.RemoteService; import com.google.gwt.user.client.rpc.RemoteServiceRelativePath; /** * The client side stub for the Test Service. * @author Darren */ @RemoteServiceRelativePath("testService") public interface TestService extends RemoteService { TestObject test(); } </code></pre> <p>TestServiceAsync.java</p> <pre><code>package org.redboffin.worldhug.client.test; import org.redboffin.worldhug.server.test.TestObject; import com.google.gwt.user.client.rpc.AsyncCallback; /** * The async counterpart of &lt;code&gt;TestService&lt;/code&gt;. * @author Darren */ public interface TestServiceAsync { void test(AsyncCallback&lt;TestObject&gt; callback); } </code></pre> <p>TestServiceImpl.java</p> <pre><code>package org.redboffin.worldhug.server.test; import java.util.List; import org.redboffin.worldhug.client.test.TestService; import com.google.gwt.user.server.rpc.RemoteServiceServlet; /** * The server side implementation of the RPC service. * @author Darren */ @SuppressWarnings("serial") public class TestServiceImpl extends RemoteServiceServlet implements TestService { @Override public TestObject test() { TestObject testObject = new TestObject(); testObject.setTestObjectString("Test Object String"); InnerObject innerObject = new InnerObject(); innerObject.setInnerObjectString("Inner Object String"); testObject.setInnerObject(innerObject); List&lt;ListObject&gt; listObjects = testObject.getListObjects(); ListObject listObjectOne = new ListObject(); listObjectOne.setListObjectString("List Object One"); listObjects.add(0, listObjectOne); ListObject listObjectTwo = new ListObject(); listObjectTwo.setListObjectString("List Object Two"); listObjects.add(0, listObjectTwo); ListObject listObjectThree = new ListObject(); listObjectThree.setListObjectString("List Object Three"); listObjects.add(0, listObjectThree); return testObject; } } </code></pre> <p>TestView.java</p> <pre><code>package org.redboffin.worldhug.client.test; import java.util.ArrayList; import java.util.Iterator; import org.redboffin.worldhug.server.test.InnerObject; import org.redboffin.worldhug.server.test.ListObject; import org.redboffin.worldhug.server.test.TestObject; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.uibinder.client.UiHandler; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.VerticalPanel; public class TestView extends Composite { private static TestViewUiBinder uiBinder = GWT.create(TestViewUiBinder.class); interface TestViewUiBinder extends UiBinder&lt;VerticalPanel, TestView&gt; {} @UiField Label testObjectStringLabel; @UiField Label innerObjectStringLabel; @UiField VerticalPanel listObjectsPanel; @UiField Button button; @UiField Label errorMessageLabel; public TestView(String firstName) { initWidget(uiBinder.createAndBindUi(this)); } @UiHandler("button") void onClick(ClickEvent e) { TestServiceAsync testService = (TestServiceAsync) GWT.create(TestService.class); AsyncCallback&lt;TestObject&gt; callback = new AsyncCallback&lt;TestObject&gt;() { public void onSuccess(TestObject testObject) { testObjectStringLabel.setText(testObject.getTestObjectString()); InnerObject innerObject = testObject.getInnerObject(); innerObjectStringLabel.setText(innerObject.getInnerObjectString()); ArrayList&lt;ListObject&gt; listObjects = (ArrayList&lt;ListObject&gt;) testObject.getListObjects(); Iterator&lt;ListObject&gt; iterator = listObjects.iterator(); while(iterator.hasNext()) { ListObject listObject = (ListObject) iterator.next(); listObjectsPanel.add(new Label(listObject.getListObjectString())); } } public void onFailure(Throwable caught) { errorMessageLabel.setText("Error : "+caught.getMessage()); } }; testService.test(callback); } } </code></pre> <p>TestView.ui.xml</p> <pre><code>&lt;!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent"&gt; &lt;ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui"&gt; &lt;g:VerticalPanel&gt; &lt;g:Label&gt;Test Object&lt;/g:Label&gt; &lt;g:Label ui:field="testObjectStringLabel"&gt;&lt;/g:Label&gt; &lt;g:VerticalPanel&gt; &lt;g:Label&gt;Inner Object&lt;/g:Label&gt; &lt;g:Label ui:field="innerObjectStringLabel"&gt;&lt;/g:Label&gt; &lt;/g:VerticalPanel&gt; &lt;g:VerticalPanel ui:field="listObjectsPanel"&gt; &lt;g:Label&gt;List Objects&lt;/g:Label&gt; &lt;/g:VerticalPanel&gt; &lt;g:Button ui:field="button"&gt;Display Test Object&lt;/g:Button&gt; &lt;g:Label ui:field="errorMessageLabel"&gt;&lt;/g:Label&gt; &lt;/g:VerticalPanel&gt; &lt;/ui:UiBinder&gt; </code></pre> <p>Thank you for reading this far and for any help you may be able to give me (and others).</p>
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    1. COThe amount of boilerplate code in Java RPC bothers me more than anything else in Java. I really wish, in this case at least, they'd take the Convention Over Configuration approach of Ruby and just let you drop a serializable object on the line. I've actually tried this approach, having an arrivedAt() method called whenever you arrived at a new VM. It was really slick but the arrivedAt method had a tendency to pull the entire client AND server into each build. Gave up but I have this idea of being able to tag methods @client or @server and conditionally compile them...
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