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temperature-converter: Stateless Session EJB (SLSB)

Author: Bruce Wolfe
Level: Beginner
Technologies: CDI, JSF, SLSB EJB
Summary: The temperature-converter quickstart does temperature conversion using an EJB Stateless Session Bean (SLSB), CDI, and a JSF front-end client.
Target Product: JBoss EAP
Source: https://github.com/jboss-developer/jboss-eap-quickstarts/

What is it?

The temperature-converter example demonstrates the use of an EJB Stateless Session Bean (SLSB) and CDI, accessed using a JSF, and deployed to Red Hat JBoss Enterprise Application Platform using a WAR archive.

The application does the following:

  1. The User Interface is a JSF page that asks for a temperature and a scale (Fahrenheit or Celsius).
  2. When you click on Convert, the temperature string is passed to the TemperatureConverter controller (managed) bean.
  3. The managed bean then invokes the convert() method of the injected TemperatureConvertEJB (notice the field annotated with @Inject).
  4. The response from TemperatureConvertEJB is stored in the temperature field of the managed bean.
  5. The managed bean is annotated as @SessionScoped, so the same managed bean instance is used for the entire session.

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 prompt and navigate to the root of the JBoss EAP directory.

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

     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 prompt and navigate to the root directory of this quickstart.

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

     mvn clean install wildfly:deploy

  4. This will deploy target/temperature-converter.war to the running instance of the server.

Access the Application

The application will be running at the following URL: http://localhost:8080/temperature-converter/.

You will be presented with a simple form for temperature conversion.

  1. Optionally, Select a scale: Celsius or Fahrenheit.
  2. Enter a temperature.
  3. Press the Convert button to see the results.

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