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helloworld-errai: Hello World Using the Errai Framework

Author: Jonathon Fuerth

What is it?

This example demonstrates the use of CDI 1.0 and JAX-RS in JBoss Enterprise Application Platform 6 or JBoss AS 7 with a GWT front-end client.

GWT is basically a typesafe, statically checked programming model for producing HTML5+CSS3+JavaScript front-ends. In this example, we use RESTful services on the backend. The client communicates with the backend using stubs that are generated based on the JAX-RS resources when the application is compiled.

You can test the REST endpoint at the URL http://localhost:8080/jboss-as-helloworld-errai/hello/json/David

System requirements

All you need to build this project is Java 6.0 (Java SDK 1.6) or better, Maven 3.0 or better.

The application this project produces is designed to be run on JBoss Enterprise Application Platform 6 or JBoss AS 7.

Configure Maven

If you have not yet done so, you must Configure Maven before testing the quickstarts.

Start JBoss Enterprise Application Platform 6 or JBoss AS 7 with the Web Profile

  1. Open a command line and navigate to the root of the JBoss server directory.

  2. The following shows the command line to start the server with the web profile:

      For Linux:   JBOSS_HOME/bin/standalone.sh
  For Windows: JBOSS_HOME\bin\standalone.bat

Build and Deploy the Quickstart

NOTE: The following build command assumes you have configured your Maven user settings. If you have not, you must include Maven setting arguments on the command line. See Build and Deploy the Quickstarts for complete instructions and additional options.

Build and Deploy the Archive

  1. Make sure you have started the JBoss Server as described above.

  2. Open a command line and navigate to the root directory of this quickstart.

  3. Type this command to build and deploy the archive:

         mvn clean package jboss-as:deploy

  4. This will deploy target/jboss-as-helloworld-errai.war to the running instance of the server.

Undeploy the Archive

  1. Make sure you have started the JBoss Server as described above.

  2. Open a command line and navigate to the root directory of this quickstart.

  3. Type this command to undeploy the archive:

         mvn jboss-as:undeploy

Access the application

The application will be running at the following URL: http://localhost:8080/jboss-as-helloworld-errai/.

Run the Application in GWT Dev Mode

GWT Dev Mode provides an edit-save-refresh development experience. If you plan to modify this demo, we recommend you start the application in Dev Mode so you don't have to repackage the entire application every time you change it.

  1. Deploy the WAR file and start the JBoss Server as described above.

  2. Open a command line and navigate to the helloworld-errai quickstart directory

  3. Execute the following command:

     mvn gwt:run

Run the Quickstart in JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts from Eclipse using JBoss tools. For more information, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts

Debug the Application

If you want to debug the source code or look at the Javadocs of any library in the project, run either of the following commands to pull them into your local repository. The IDE should then detect them.

  mvn dependency:sources
  mvn dependency:resolve -Dclassifier=javadoc