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websocket-endpoint: Web application using WebSockets and JSON-P

Author: Rafael Benevides
Level: Beginner
Technologies: CDI, WebSocket, JSON-P
Summary: Shows how to use WebSockets with JSON to broadcast information to all open WebSocket sessions in JBoss EAP.
Target Product: JBoss EAP
Source: https://github.com/jboss-developer/jboss-eap-quickstarts/

What is it?

The websocket-endpoint quickstart demonstrates how to use Java API for WebSockets to create server endpoints in Red Hat JBoss Enterprise Application Platform.

The BidWebSocketEndpoint provides the WebSocket endpoint that receives Message instances from clients/browsers and replies with the current Bidding instance. The conversion from JSON content to the specific instances are made by MessageDecoder and BiddingEncode classes.

Every update made on the Bidding are immediately propagated to all opened WebSocket sessions without any browser submission or AJAX polling mechanism.

System Requirements

The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 7.1 or later.

All you need to build this project is Java 8.0 (Java SDK 1.8) or later and Maven 3.3.1 or later. See Configure Maven for JBoss EAP 7.1 to make sure you are configured correctly for testing the quickstarts.

Use of EAP7_HOME

In the following instructions, replace EAP7_HOME with the actual path to your JBoss EAP installation. The installation path is described in detail here: Use of EAP7_HOME and JBOSS_HOME Variables.

Start the Server

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

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

     For Linux:   EAP7_HOME/bin/standalone.sh
 For Windows: EAP7_HOME\bin\standalone.bat

Build and Deploy the Quickstart

  1. Make sure you have started the JBoss EAP 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 wildfly:deploy

  4. This will deploy target/websocket-endpoint.war to the running instance of the server.

Access the application

Access the running application in a browser at the following URL: http://localhost:8080/websocket-endpoint/

You are presented with a simple form that shows a bidding with the status NOT_STARTED.

Click on Do a bid! button. That will start the bidding and trigger the 1 minute countdown timer. You can also notice that every Bid will be listed under the List of bids section.

You should open the application URL in other browsers or tabs. You will notice that every change on the bidding is automatically update in all opened browser or tabs. The item will be SOLD once that it reaches the Buy now price. At the countdown timeout, the bidding will be EXPIRED. You can click on Buy it now button to immediately buy the item.

You can restart the bidding if you click on Reset bidding button.

Undeploy the Archive

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

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

  3. When you are finished testing, type this command to undeploy the archive:

     mvn wildfly:undeploy

Run the Quickstart in Red Hat JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts or run the Arquillian tests from Eclipse using JBoss tools. For general information about how to import a quickstart, add a JBoss EAP server, and build and deploy a quickstart, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts.

Debug the Application

If you want to debug the source code of any library in the project, run the following command to pull the source into your local repository. The IDE should then detect it.

mvn dependency:sources