Adding a Module to JBoss EAP

The JBoss Enterprise Application Platform provides extensive support for deploying and managing Java-based applications. Part of this support includes the ability to add and create modules, which in turn opens up additional functionality for your application — such as allowing the option to connect to a MySQL database, as in this lab.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Download Module Drivers

Download the MySQL JDBC connector:

wget https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.18.tar.gz

Extract the contents:

tar xf mysql-connector-java-8.0.18.tar.gz

Create Module

Move into the modules directory:
```
cd /opt/jboss-eap/modules
```

Create com directory to store local, non-system modules:
```
sudo mkdir com
```
We can now create the mysql module directory underneath this; each module stores all required configurations and JAR files in a required main directory, so create this, too:
```
sudo mkdir -p com/mysql/main
```

Move the downloaded .jar file into this new directory:

sudo mv ~/mysql-connector-java-8.0.18/mysql-connector-java-8.0.18.jar com/mysql/main/

Create .xml File

Within the main directory for the mysql module, create a module.xml file to configure the MySQL JDBC diver. Note that the name of the module must mimic the directory structure — in this case, it should be com.mysql:

sudo vim com/mysql/main/module.xml

<?xml version="1.0" ?>
<module xmlns="urn:jboss:module:1.1" name="com.mysql">
  <resources>
    <resource-root path="mysql-connector-java-8.0.18.jar"/>
  </resources>
  <dependencies>
    <module name="javax.api"/>
    <module name="javax.transaction.api"/>
  </dependencies>
</module>

Note that the dependencies provided are system modules, found in /opt/jboss-eap/modules/system/layers/base/javax/.

Add as a Global Module

Open the management CLI:
```
cd ..
sudo ./bin/jboss-cli.sh
```

Connect:
```
connect
```

Add the module to global modules, under the EE subsystem:

/subsystem=ee:list-add(name=global-modules,value={name=com.mysql})

We can check that the module has been added by logging in to the Management Console at PUBLICIP:9990 using the username admin and the password pinehead. Select Start, under Configuration, then select Subsystems from the menu. View the EE subsystem. Select Global Modules — the com.mysql module should be listed.

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Adding a Module to JBoss EAP

About this Hands-on Lab

Learning Objectives

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