The installation of JDBC drivers and the setup of (xa)datasources is a common task for every JEE developer and administrator. This post describes the installation and setup of a MySQL driver and datasource using WildFly 9 in both standalone and domain mode. The setup assumes a running MySQL database called test on localhost. If you use another database, you’ll probably go through the same steps, but using different parameters.

When installing a driver you basically have two options: install it as module or deploy it like any other application package. However when running domain mode you should choose to install the driver as module. Otherwise the driver won’t be recognized by the :installed-drivers-list operation. Drivers deployed as application packages need a running server, which cannot be guaranteed in domain mode. Thus the recommendation is to always use the module option in domain mode. For standalone mode you are free to choose between module and deployment since both options will work.

Install as Module

1. Download the driver from the MySQL website
2. Go to WILDFLY_HOME/modules/system/layers/base/com and create the folder mysql/main
3. Unzip the downloaded file and copy the file mysql-connector-java-5.1.23-bin.jar to the new folder WILDFLY_HOME/modules/system/layers/base/com/mysql/main
4. Create the file module.xml in the same folder with the following content:

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<module xmlns="urn:jboss:module:1.3" name="com.mysql">
    <resources>
        <resource-root path="mysql-connector-java-5.1.35-bin.jar"/>
    </resources>
    <dependencies>
        <module name="javax.api"/>
        <module name="javax.transaction.api"/>
    </dependencies>
</module>

The name of the driver file may vary, so make sure you declare exactly the same name in the resource-root tag. After restarting WildFly the module is available and can be referenced to create a JDBC driver. Open the CLI and execute the following command for standalone mode:

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[standalone@localhost:9990 /] /subsystem=datasources/jdbc-driver=mysql:add(\
    driver-name=mysql,\
    driver-module-name=com.mysql,\
    driver-class-name=com.mysql.jdbc.Driver,\
    driver-xa-datasource-class-name=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource\
)

and this command if you’re using domain mode:

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[domain@localhost:9990 /] /profile=full/subsystem=datasources/jdbc-driver=mysql:add(\
    driver-name=mysql,\
    driver-module-name=com.mysql,\
    driver-class-name=com.mysql.jdbc.Driver,\
    driver-xa-datasource-class-name=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource\
)

Install as Deployment

Please note that this option is only valid for JDBC4 compliant drivers. For none JDBC4 compliant drivers you should install the driver as a module. Furthermore it’s not recommended for the domain mode.

1. Download the driver from the MySQL website
2. Unzip the downloaded file and deploy and enable the file mysql-connector-java-5.1.23-bin.jar

The contained JDBC drivers will be automatically detected and registered (no need to execute additional management operations).

Setup a Datasource

In order to setup a datasource open the management console and navigate to “Configuration / (Profile …) / Datasources” and click “Add” to bring up the wizard for creating a (XA) datasource. The console already contains templates for the most common databases. The templates combine settings like connection url, validation checker and exception sorter implementations. Choose “MySQL Datasource” and adjust the settings as necessary. You should see the JDBC driver you’ve installed as module or deployment in the “JDBC Driver” step under “Detected Driver”.

If you prefer to use the CLI to create the datasource use a command like this one (leave out /profile=full for standalone mode):

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[domain@localhost:9990 /] /profile=full/subsystem=datasources/data-source=MySqlDS:add(\
    jndi-name=java:/MySqlDS,\
    driver-name=mysql,\
    connection-url=jdbc:mysql://localhost:3306/test
)

However please note that you have to configure database specific settings like validation checker et al by yourself.

Use the Datasource

When running domain mode, the datasource is always bound to a profile and thus accessible by servers which are part of a server group which in turn uses that profile.

To access the datasource in your JEE app, use the JNDI name. Here’s an example of a JPA configuration:

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<persistence-unit name="app-pu" transaction-type="JTA">
    <jta-data-source>java:/MySqlDS</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties/>
</persistence-unit>

and here an example for a resource injection:

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public class SomeClass {
    @Resource(name = "java:/MySqlDS")
    private javax.sql.DataSource dataSource;
}