# helloworld-mdb: Helloworld Using an MDB (Message-Driven Bean)

Serge Pagop, Andy Taylor, Jeff Mesnil

> The `helloworld-mdb` quickstart uses JMS and EJB Message-Driven Bean (MDB) to create and deploy JMS topic and queue resources in WildFly.

## What is it?

The `helloworld-mdb` quickstart demonstrates the use of JMS and EJB Message-Driven Bean in WildFly Application Server.

This project creates two JMS resources:

- A queue named `HELLOWORLDMDBQueue` bound in JNDI as `java:/queue/HELLOWORLDMDBQueue`

- A topic named `HELLOWORLDMDBTopic` bound in JNDI as `java:/topic/HELLOWORLDMDBTopic`

## System Requirements

The application this project produces is designed to be run on WildFly Application Server 13 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 to Build and Deploy the Quickstarts to make sure you are configured correctly for testing the quickstarts.

## Use of WILDFLY_HOME

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

## Start the WildFly Standalone Server

1. Open a terminal and navigate to the root of the WildFly directory.

2. Start the WildFly server with the full profile by typing the following command.

       $ WILDFLY_HOME/bin/standalone.sh -c standalone-full.xml

   Note | For Windows, use the `WILDFLY_HOME\bin\standalone.bat` script.

## Build and Deploy the Quickstart

1. Make sure you start the WildFly server as described above.

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

3. Type the following command to build the artifacts.

       $ mvn clean package wildfly:deploy

This deploys the `helloworld-mdb/target/helloworld-mdb.war` to the running instance of the server.

You should see a message in the server log indicating that the archive deployed successfully.

Look at the WildFly console or server log and you should see log messages corresponding to the deployment of the message-driven beans and the JMS destinations:

    ...
    INFO  [org.wildfly.extension.messaging-activemq] (MSC service thread 1-4) WFLYMSGAMQ0002: Bound messaging object to jndi name java:/queue/HELLOWORLDMDBQueue
    INFO  [org.wildfly.extension.messaging-activemq] (MSC service thread 1-2) WFLYMSGAMQ0002: Bound messaging object to jndi name java:/topic/HELLOWORLDMDBTopic
    ....
    INFO  [org.apache.activemq.artemis.core.server] (ServerService Thread Pool -- 67) AMQ221003: trying to deploy queue jms.queue.HelloWorldMDBQueue
    ...
    INFO  [org.apache.activemq.artemis.core.server] (ServerService Thread Pool -- 12) AMQ221003: trying to deploy queue jms.topic.HelloWorldMDBTopic
    INFO  [org.jboss.as.ejb3] (MSC service thread 1-7) WFLYEJB0042: Started message driven bean 'HelloWorldQueueMDB' with 'activemq-ra.rar' resource adapter
    INFO  [org.jboss.as.ejb3] (MSC service thread 1-6) WFLYEJB0042: Started message driven bean 'HelloWorldQTopicMDB' with 'activemq-ra.rar' resource adapter

## Access the Application

The application will be running at the following URL: http://localhost:8080/helloworld-mdb/ and will send some messages to the queue.

To send messages to the topic, use the following URL: http://localhost:8080/helloworld-mdb/HelloWorldMDBServletClient?topic

## Investigate the Server Console Output

Look at the WildFly console or Server log and you should see log messages like the following:

    INFO  [class org.jboss.as.quickstarts.mdb.HelloWorldQueueMDB] (Thread-9 (ActiveMQ-client-global-threads-1189700957)) Received Message from queue: This is message 5
    INFO  [class org.jboss.as.quickstarts.mdb.HelloWorldQueueMDB] (Thread-6 (ActiveMQ-client-global-threads-1189700957)) Received Message from queue: This is message 1
    INFO  [class org.jboss.as.quickstarts.mdb.HelloWorldQueueMDB] (Thread-7 (ActiveMQ-client-global-threads-1189700957)) Received Message from queue: This is message 4
    INFO  [class org.jboss.as.quickstarts.mdb.HelloWorldQueueMDB] (Thread-5 (ActiveMQ-client-global-threads-1189700957)) Received Message from queue: This is message 2
    INFO  [class org.jboss.as.quickstarts.mdb.HelloWorldQueueMDB] (Thread-4 (ActiveMQ-client-global-threads-1189700957)) Received Message from queue: This is message 3

## Undeploy the Quickstart

When you are finished testing the quickstart, follow these steps to undeploy the archive.

1. Make sure you start the WildFly server as described above.

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

3. 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 in Red Hat JBoss Developer Studio or from Eclipse using JBoss tools. For general information about how to import a quickstart, add a WildFly server, and build and deploy a quickstart, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts.

Note | Within JBoss Developer Studio, make sure you define a server runtime environment that uses the `standalone-full.xml` configuration file.

## 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