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A Cloud Guru

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.

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Path Info

Level

Beginner

Duration

15m

Published

Jan 24, 2020

Challenge

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

Challenge

Create Module
1. Move into the modules directory:
```
cd /opt/jboss-eap/modules
```
2. Create com directory to store local, non-system modules:
```
sudo mkdir com
```
3. 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
```
4. 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/
```
Challenge

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/.
Challenge

Add as a Global Module
1. Open the management CLI:
```
cd ..
sudo ./bin/jboss-cli.sh
```
2. Connect:
```
connect
```
3. Add the module to global modules, under the EE subsystem:
```
/subsystem=ee:list-add(name=global-modules,value={name=com.mysql})
```
4. 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.

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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