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Thanks for your answer.

I copied both jdbc.jar and module.xml in jboss-as-7.1.1.Final\modules\MySQL\jdbc\main folder.

This is my datasources configuration:

<subsystem xmlns="urn:jboss:domain:datasources:1.0">

            <datasources>

                <datasource jndi-name="java:jboss/datasources/jbpmDS" pool-name="H2DS" enabled="true" use-java-context="true">

                    <connection-url>jdbc:mysql://10.21.101.175:3306/jbpm5</connection-url>

                    <driver>mysql</driver>

                    <security>

                        <user-name>jbpm5</user-name>

                        <password>jbpm5</password>

                    </security>

                </datasource>

                <drivers>

                    <driver name="mysql" module="MySQL.jdbc">

                        <xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class>

                    </driver>

                </drivers>

            </datasources>

        </subsystem>