GWT 2.4 AutoBean example not working

[brent...@gmail.com]

I'm trying to use a GWT AutoBean for some client/server stuff I'm working on and I can't get it to work no matter what I try... I feel like I'm missing something obvious... any idea?

Here's the exception:

Caused by: java.lang.NoClassDefFoundError: org/json/JSONException at com.google.web.bindery.autobean.shared.impl.StringQuoter.createSplittable(StringQuoter.java:58) at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.(AbstractAutoBean.java:71) at test.client.Test_PersonAutoBean.(Test_PersonAutoBean.java:39) at test.client.Test_MyFactoryImpl.person(Test_MyFactoryImpl.java:26) at test.client.Test$DoSomething.makePerson(Test.java:39) at test.client.Test.onModuleLoad(Test.java:137) ... 9 more Caused by: java.lang.ClassNotFoundException at com.google.gwt.dev.shell.CompilingClassLoader$MultiParentClassLoader.findClass(CompilingClassLoader.java:365) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 15 more

Here' the test code that causes the issue...  The same thing happens in my real application.  I'm running this from Eclipse Dev/Mode.

package test.client;

import test.shared.FieldVerifier;

import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.core.client.GWT;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.KeyCodes;

import com.google.gwt.event.dom.client.KeyUpEvent;

import com.google.gwt.event.dom.client.KeyUpHandler;

import com.google.gwt.user.client.rpc.AsyncCallback;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.DialogBox;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.RootPanel;

import com.google.gwt.user.client.ui.TextBox;

import com.google.gwt.user.client.ui.VerticalPanel;

import com.google.web.bindery.autobean.shared.AutoBean;

import com.google.web.bindery.autobean.shared.AutoBeanCodex;

import com.google.web.bindery.autobean.shared.AutoBeanFactory;

import com.google.web.bindery.autobean.shared.AutoBeanUtils;

/**

 * Entry point classes define <code>onModuleLoad()</code>.

 */

public class Test implements EntryPoint {

public class DoSomething {

// Instantiate the factory

MyFactory factory = GWT.create(MyFactory.class);

// In non-GWT code, use AutoBeanFactorySource.create(MyFactory.class);

public Person makePerson() {

// Construct the AutoBean

AutoBean<Person> person = factory.person();

// Return the Person interface shim

return person.as();

}

public String serializeToJson(Person person) {

// Retrieve the AutoBean controller

AutoBean<Person> bean = AutoBeanUtils.getAutoBean(person);

return AutoBeanCodex.encode(bean).getPayload();

}

public Person deserializeFromJson(String json) {

AutoBean<Person> bean = AutoBeanCodex.decode(factory, Person.class,

json);

return bean.as();

}

}

// Declare any bean-like interface with matching getters and setters, no base

// type is necessary

public interface Person {

public Address getAddress();

public String getName();

public void setName(String name);

public void setAddress(Address a);

}

public interface Address {

// Other properties, as above

}

// Declare the factory type

public interface MyFactory extends AutoBeanFactory {

public AutoBean<Address> address();

public AutoBean<Person> person();

}

/**

* The message displayed to the user when the server cannot be reached or

* returns an error.

*/

private static final String SERVER_ERROR = "An error occurred while "

+ "attempting to contact the server. Please check your network "

+ "connection and try again.";

/**

* Create a remote service proxy to talk to the server-side Greeting

* service.

*/

private final GreetingServiceAsync greetingService = GWT

.create(GreetingService.class);

/**

* This is the entry point method.

*/

public void onModuleLoad() {

final Button sendButton = new Button("Send");

final TextBox nameField = new TextBox();

nameField.setText("GWT User");

final Label errorLabel = new Label();

// We can add style names to widgets

sendButton.addStyleName("sendButton");

// Add the nameField and sendButton to the RootPanel

// Use RootPanel.get() to get the entire body element

RootPanel.get("nameFieldContainer").add(nameField);

RootPanel.get("sendButtonContainer").add(sendButton);

RootPanel.get("errorLabelContainer").add(errorLabel);

// Focus the cursor on the name field when the app loads

nameField.setFocus(true);

nameField.selectAll();

// Create the popup dialog box

final DialogBox dialogBox = new DialogBox();

dialogBox.setText("Remote Procedure Call");

dialogBox.setAnimationEnabled(true);

final Button closeButton = new Button("Close");

// We can set the id of a widget by accessing its Element

closeButton.getElement().setId("closeButton");

final Label textToServerLabel = new Label();

final HTML serverResponseLabel = new HTML();

VerticalPanel dialogVPanel = new VerticalPanel();

dialogVPanel.addStyleName("dialogVPanel");

dialogVPanel.add(new HTML("<b>Sending name to the server:</b>"));

dialogVPanel.add(textToServerLabel);

dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));

dialogVPanel.add(serverResponseLabel);

dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);

dialogVPanel.add(closeButton);

dialogBox.setWidget(dialogVPanel);

DoSomething test = new DoSomething();

test.makePerson();

// Add a handler to close the DialogBox

closeButton.addClickHandler(new ClickHandler() {

public void onClick(ClickEvent event) {

dialogBox.hide();

sendButton.setEnabled(true);

sendButton.setFocus(true);

}

});

// Create a handler for the sendButton and nameField

class MyHandler implements ClickHandler, KeyUpHandler {

/**

* Fired when the user clicks on the sendButton.

*/

public void onClick(ClickEvent event) {

sendNameToServer();

}

/**

* Fired when the user types in the nameField.

*/

public void onKeyUp(KeyUpEvent event) {

if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {

sendNameToServer();

}

}

/**

* Send the name from the nameField to the server and wait for a

* response.

*/

private void sendNameToServer() {

// First, we validate the input.

errorLabel.setText("");

String textToServer = nameField.getText();

if (!FieldVerifier.isValidName(textToServer)) {

errorLabel.setText("Please enter at least four characters");

return;

}

// Then, we send the input to the server.

sendButton.setEnabled(false);

textToServerLabel.setText(textToServer);

serverResponseLabel.setText("");

greetingService.greetServer(textToServer,

new AsyncCallback<String>() {

public void onFailure(Throwable caught) {

// Show the RPC error message to the user

dialogBox

.setText("Remote Procedure Call - Failure");

serverResponseLabel

.addStyleName("serverResponseLabelError");

serverResponseLabel.setHTML(SERVER_ERROR);

dialogBox.center();

closeButton.setFocus(true);

}

public void onSuccess(String result) {

dialogBox.setText("Remote Procedure Call");

serverResponseLabel

.removeStyleName("serverResponseLabelError");

serverResponseLabel.setHTML(result);

dialogBox.center();

closeButton.setFocus(true);

}

});

}

}

// Add a handler to send the name to the server

MyHandler handler = new MyHandler();

sendButton.addClickHandler(handler);

nameField.addKeyUpHandler(handler);

}

}

[Thomas Broyer]

You need org.json classes in your class path. gwt-servlet-deps.jar contains them if you need it.

[brent...@gmail.com]

That worked.  Thanks!

We should get that added to the wiki documentation some how...

[Thomas Broyer]

On Monday, July 16, 2012 12:53:47 PM UTC+2, brent...@gmail.com wrote:

That worked.  Thanks!

We should get that added to the wiki documentation some how...

It should no longer be a problem with 2.5.0-rc1, as org.json classes are now bundled into gwt-dev.jar.