The example data source definition file for firebird in JBoss is incorrect.

Instead of using User-name and password as tags these must be provides the same way Database parameter is provided.

<config-property name="userName" type="java.lang.String">sysdba</config-property>
<config-property name="password" type="java.lang.String">masterkey</config-property>

instead of

<user-name>sysdba</user-name>
<password>masterkey</password>