Zoltan Papp [https://community.jboss.org/people/pzoli] created the discussion "Re: MySQL database connection error" To view the discussion, visit: https://community.jboss.org/message/805364#805364 -------------------------------------------------------------- Okay, let's speak english. My persistance.xml in a JPA/CDI project: <datasources xmlns=" http://www.jboss.org/ironjacamar/schema http://www.jboss.org/ironjacamar/schema" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation=" http://www.jboss.org/ironjacamar/schema http://www.jboss.org/ironjacamar/schema http://docs.jboss.org/ironjacamar/schema/datasources_1_0.xsd http://docs.jboss.org/ironjacamar/schema/datasources_1_0.xsd">     <!-- The datasource is bound into JNDI at this location. We reference        this in META-INF/persistence.xml -->    <datasource jndi-name="java:jboss/datasources/sample-multi-tierDS"       pool-name="{artifactId}" enabled="true"       use-java-context="true">         <connection-url>jdbc:mysql://localhost:3306/bigfilesystem?useUnicode=true&amp;autoReconnect=true&amp;characterEncoding=UTF-8</connection-url>         <driver>com.mysql</driver>         <security>             <user-name>username</user-name>             <password>password</password>         </security>    </datasource> </datasources> Did you install mysql driver to JBoss modules/com/mysql subdirectory? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/805364#805364] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]