ejb-asynchronous: An application with an EJB with asynchronous methods to demonstrate how it works

Author: Wolf-Dieter Fink Level: Advanced Technologies: EJB Summary: Demonstrates asynchronous EJB invocations. Target Product: EAP Source: https://github.com/jboss-jdf/jboss-as-quickstart/

What is it?

This is a quickstart to demonstrate the behavior of asynchronous EJB invocations. The methods are invoked by both an EJB in the deployment and by a remote client. The quickstart also shows error handling if the asynchronous method invocation fails.

The example is composed of 2 maven modules, each with a shared parent. The modules are as follows:

1. ejb: This module contains the EJB's and will be deployed to the server
2. client : This module contains a remote ejb client

The root pom.xml builds each of the submodules in the above order and deploys the archive to the server.

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

You can copy or link to the Maven configuration information in the README file in the root folder of the quickstarts. For example:

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.

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 install jboss-as:deploy
   

4. This will deploy service/target/jboss-as-ejb-asynchronous.jar to the running instance of the server.

Check whether the application is deployed successfully.

Access the application

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

2. Type this command to start the client

    cd client
    mvn exec:exec
   

3. Check the client output

    INFO: The server log should contain a message at (about) <date>, indicating that the call to the asynchronous bean completed.
    INFO: Got the async result as expected => returning at <date>, duration was 200ms
    INFO: Got the async result as expected after wait => returning at <date>, duration was 1500ms
    INFO: Catch the expected Exception of the asynchronous execution!
    INFO: Results of the parallel (server) processing : [returning at <date> duration was 5000ms, returning at <date>, duration was 3000ms]
   

4. Check the server log.

   There should be two INFO log messages for the fireAndForget invocation:

      'fireAndForget' Will wait for 15000ms
   

   and 15sec later (the client should be finished at this time)

      action 'fireAndForget' finished
   

NOTE: In AS7.1.1.Final there is a bug that an ERROR will be logged that the result can not be written.

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

    mvn jboss-as:undeploy
   

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

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