standalone.xml - If you're using the JBoss AS 7 server
<datasource jndi-name="java:jboss/datasources/jbpmDS" pool-name="H2DS" enabled="true" jta="true" use-java-context="true" use-ccm="true">
<connection-url>jdbc:oracle:thin:@localhost:1521:test</connection-url>
<driver>oracle</driver>
<pool>
<min-pool-size>1</min-pool-size>
<max-pool-size>4</max-pool-size>
<prefill>false</prefill>
<use-strict-min>false</use-strict-min>
<flush-strategy>FailingConnectionOnly</flush-strategy>
</pool>
<security>
<user-name>scott</user-name>
<password>scott</password>
</security>
<validation>
<check-valid-connection-sql>SELECT 1</check-valid-connection-sql>
<validate-on-match>false</validate-on-match>
<background-validation>false</background-validation>
</validation>
</datasource>
<drivers>
<driver name="oracle" module="com.oracle">
<xa-datasource-class>oracle.jdbc.xa.client.OracleXADataSource</xa-datasource-class>
</driver>
</drivers>
</datasources>