Wildfly 9 failing to load MySQL driver on startup

Question

I am creating a web application for WildFly, which will connect to a MySQL database through JPA (Hibernate). For now, I am just trying to get WildFly to start up and load the MySQL driver in standalone mode. I am using this page as a guide: http://wildfly.org/news/2014/02/06/GlassFish-to-WildFly-migration/

I am running WildFly and MySQL locally on a Windows system:

• Windows 7 Enterprise SP1
• Oracle Java SE 1.8.0_45
• WildFly 9.0.0.Final
• MySQL Server 5.6

Attempts to use the recommended console commands did not succeed, so I have manually edited to WildFly configuration files to look like those in the examples on the page linked above. First, I created the module directory and placed in it the MySQL connector JAR and module.xml file:

    Directory of C:\wildfly-9.0.0.Final\modules\system\layers\base\com\mysql\main

07/06/2015  09:54 AM    <DIR>          .
07/06/2015  09:54 AM    <DIR>          ..
07/06/2015  10:12 AM               334 module.xml
07/01/2015  02:38 PM           968,668 mysql-connector-java-5.1.35.jar

The above connector jar was copied from my local Maven repository, which Maven obtained through the following dependency:

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.35</version>
</dependency>

The module.xml file was manually edited as follows, to resemble the example I found on wildfly.org:

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.1" 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>

Finally, I added the driver and datasource to the datasources section of standalone.xml:

        <datasource jndi-name="java:/MySQLDS" pool-name="MyDS" enabled="true" use-java-context="true">
            <connection-url>jdbc:mysql://localhost:3306/mydb</connection-url>
            <driver>mysql</driver>
            <security>
                <user-name>root</user-name>
                <password>secret</password>
            </security>
        </datasource>
        <drivers>
            <driver name="h2" module="com.h2database.h2">
                <xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>
            </driver>
            <driver name="mysql" module="com.mysql">
                <driver-class>com.mysql.jdbc.Driver</driver-class>
            </driver>
        </drivers>

Upon starting WildFly in standalone mode, by running %WILDFLY_HOME%\bin\standalone.bat, the following is the first error listed in %WILDFLY_HOME%\standalone\logs\server.log:

2015-07-06 10:25:47,321 ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 33) WFLYCTL0013: Operation ("add") failed - address: ([
    ("subsystem" => "datasources"),
    ("jdbc-driver" => "mysql")
]) - failure description: "WFLYJCA0041: Failed to load module for driver [com.mysql]"

Similar issues that I have seen posted on Stack Overflow and other question/answer sites usually point to an oversight such as a typo in config files or a misnamed file. However, I've been over this over and over and cannot see any such mistake, and the same error has occurred even after upgrading from Java SE 7 and WildFly 8.2 and re-creating the configuration files from scratch. Any assistance would be greatly appreciated.

Answer 1

In my case it was a matter of having the wrong user:group for the directories and files under ../com/mysql/main

I changed it to wildlfy and everything worked as expected.

Answer 2

There was a typo in module.xml. The name of the connector JAR listed in module.xml did not match the actual JAR file in modules\system\layers\base\com\mysql\main.