MyFaces 2.0 on GAE

Posted in AppEngine on April 1st, 2010 – Be the first to comment

This post describes steps to deploy JSF 2.0 application to GAE.

I use MyFaces version 2.0.0 beta 3 for this purpose.

Required jars

Download MyFaces binary from MyFaces download page.
Extract and copy all jars to WEB-INF/lib
Download Tomcat 6 from Tomcat download page (We need EL jars)
Extract and copy el-api.jar and jasper-el.jar to WEB-INF/lib

The web.xml file

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
  version="2.5">

  <context-param>
    <param-name>org.apache.myfaces.config.annotation.LifecycleProvider</param-name>
    <param-value>org.apache.myfaces.config.annotation.NoInjectionAnnotationLifecycleProvider</param-value>
  </context-param> 

  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern>
  </servlet-mapping>

</web-app>

Test index.xhtml page

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html">
<h:head><title>JSF 2.0: Test page</title></h:head>
<h:body>
  <div align="center">This is test page for JSF 2.0 on GAE</div>
</h:body>
</html>

Deploy and run

Deploy app to GAE and open http://appid.appspot.com/index.jsf

You shoud see message

This is test page for JSF 2.0 on GAE.

in your browser.

That’s it.

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Invoke GWT RPC services deployed on Google App Engine

Posted in AppEngine, GWT on March 13th, 2010 – 3 Comments

SyncProxy allows you to invoke GWT RPC services from pure Java (no JSNI) code.
From version 0.1.2, you can invoke your RPC services deployed on AppEngine.

This post shows you how to use this new feature of SyncProxy.

The service interface

For example, we have an helloApp application and a RPC service GreetingService

@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
  String greetServer(String name);
}

And the service implementation is as below

public class GreetingServiceImpl extends RemoteServiceServlet
      implements GreetingService {
  public String greetServer(String name) {
    return "Hello, " + name;
  }
}

Assume the application is deployed on AppEngine and the servlet URL is configured at http://example.appspot.com/helloApp/greet

Java client code

Create new proxy instance for the service interface:

private static GreetingService rpcService =
  SyncProxy.newProxyInstance(GreetingService.class,
        "http://example.appspot.com/helloApp", "greet");

This will create a new proxy instance which implements your GreetingService.

Then invoke the service method.

String result = rpcService.greetServer("SyncProxy");

Secure your service

We modify our service implement which enforce user to login to access to the service:

public class GreetingServiceImpl extends RemoteServiceServlet
      implements GreetingService {
  public String greetServer(String name) {
    // implement the security
    UserService userService = UserServiceFactory.getUserService();
    if (!userService.isUserLoggedIn()){
      throw new RuntimeException("Access Denied");
    }
    // We can also enforce only admin user can access to the service
    /*
    if (!userService.isUserAdmin()){
      throw new RuntimeException("Access Denied");
    }
    */

    return "Hello, " + name;
  }
}

Invoke the secured service

Before invoke the secured service, you have to login to the application.

SyncProxy.loginGAE("https://example.appspot.com",
    "http://example.appspot.com/helloApp/greet",
    "yourusername@gmail.com", "yourpassword");

Then invoke the service method.

String result = rpcService.greetServer("SyncProxy");

Download SyncProxy

Get SyncProxy (with source code) at our Downloads page

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gwtXP 0.1.2 is now available

Posted in gwtXP on March 13th, 2010 – 1 Comment

gwtXP 0.1.2 has been released and is available for download here: http://www.gdevelop.com/w/downloads/

This is a minor release that includes the following changes/fixes:

Event Handler expression can be in #{#historyToken} format: The handler will create a new history item.
selectedIndex and selectedValue for ListBox
Add valuePropName and displayPropName for ListBox
WidgetPropertyObservableValue, HasTextObservableValue, HasValueObservableValue, HasWordWrapObservableValue and HasCaptionObservableValue: Check the widget before setting value to its property
Update the demo

doSetApprovedValue

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Data Binding in GWT and gwtXP

Posted in GWT, gwtXP on March 6th, 2010 – Be the first to comment

Introduction

gwtXP uses JFace data binding (with modifications) and Expression Language concepts to allow you declare binding expression like <g:textBox text="${user.userId}"/>.

This post shows how to use data binding (property binding, list binding and table binding) in gwtXP to build gwt applications. It also shows how to build a scrollable table. See the demo.

Data model

We use following bound bean during this post. See the examples page for complete source code.

public class User{
  private transient PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);

  private String userId;
  private String fullName;
  private Date dob;
  private String email;
  private int numberOfWrongPassword;
  private String password;
  private Boolean enabled;
  ...
  // getter and setter methods
}

Basic binding

Bind a bean’s property to a GWT widget’s property. gwtXP supports most of common widgets such as Label, TextBox, PasswordTextBox, CheckBox, RadioButton, Button, etc.

Below shows some basic binding examples:

Bind to Label text

<g:label text="${user.userId}"/>

Bind to TextBox text

<g:textBox text="${user.userId}"/>

If you require the build-in user ‘admin’ can not be changed, you can disable the text box for userId value of ‘admin’:

<g:textBox text="${user.userId}" enabled="${user.userId != 'admin'}"/>

Bind to PasswordTextBox’s text and enabled properties

For example, you require the admin can set new password for enabled user only, e.g the password text box will be enabled if user.enabled is true.

<g:passwordTextBox text="${user.password}" enabled="${user.enabled}"/>

Bind to CheckBox value

<g:checkBox value="${user.enabled}"/>

Data Conversion

The data binding has build-in data converter which converts one object to another object, for example from Date to String, Number to String, etc and vice versa. Some converter requires additional ‘pattern’ attribute. The ‘pattern’ attribute describe how a converter format/parse data. If no ‘pattern’ specified, the converter uses the default one.

In gwtXP, simply add ‘pattern’ attribute to the tag as below:

<g:textBox text="${user.dob}" pattern="MM/dd/yyyy"/>

The converter also validate user input against the specified pattern.

Custom Data Validation

You can declare the validator which validate the user input as below:

<g:textBox text="${user.email}" validator="${emailValidator}"/>

The validator must implement the IValidator interface.

Validation Status

When the validating the data, validator will report a status (whether OK or error). By default, when error occurs during validation process, we add an ‘error’ style to the widget. To display the error message, we use a special errors tag as below:

<g:errors errorMessage="There was errors during validating your data."/>

Of course, you can internationalize the error message as below:

<g:errors errorMessage="${constants.multipleErrors}"/>

Read full article »

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GWT SyncProxy 0.1.1

Posted in GWT on February 25th, 2010 – Be the first to comment

GWT SyncProxy allows you to access/invoke GWT RPC service methods from pure Java (non JSNI) code.

See the previous post http://www.gdevelop.com/w/blog/2010/01/10/testing-gwt-rpc-services/ for how to use GWT SyncProxy to test GWT RPC services without using GWTTestcase.

GWT Developer's Tools

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Categories

Archives

MyFaces 2.0 on GAE

Required jars

The web.xml file

Test index.xhtml page

Deploy and run

Invoke GWT RPC services deployed on Google App Engine

The service interface

Java client code

Secure your service

Invoke the secured service

Download SyncProxy

gwtXP 0.1.2 is now available

Data Binding in GWT and gwtXP

Table of Contents

Introduction

Data model

Basic binding

Bind to Label text

Bind to TextBox text

Bind to PasswordTextBox’s text and enabled properties

Bind to CheckBox value

Data Conversion

Custom Data Validation

Validation Status

GWT SyncProxy 0.1.1

Recent Updates:

Recent Comments:

Popular Posts:

GWT Developer's Tools

gwtXP

Subscription

Tags

Categories

Archives

MyFaces 2.0 on GAE

Required jars

The web.xml file

Test index.xhtml page

Deploy and run

Invoke GWT RPC services deployed on Google App Engine

The service interface

Java client code

Secure your service

Invoke the secured service

Download SyncProxy

gwtXP 0.1.2 is now available

Data Binding in GWT and gwtXP

Table of Contents

Introduction

Data model

Basic binding

Bind to Label text

Bind to TextBox text

Bind to PasswordTextBox’s text and enabled properties

Bind to CheckBox value

Data Conversion

Custom Data Validation

Validation Status

GWT SyncProxy 0.1.1

Recent Updates:

Recent Comments:

Popular Posts: