Here is the configuration in standalone.xml file:
<datasource jndi-name="java:jboss/datasources/jbpm-ds" pool-name="OracleDS" enabled="true" jta="true" use-java-context="true" use-ccm="true">
<connection-url>
jdbc:oracle:thin:@localhost:1521:XE
</connection-url>
<driver>
ojdbc6-11.1.0.7.0.jar
</driver>
<pool>
<prefill>
false
</prefill>
<use-strict-min>
false
</use-strict-min>
<flush-strategy>
FailingConnectionOnly
</flush-strategy>
</pool>
<security>
<user-name>
jbpm
</user-name>
<password>
xyz
</password>
</security>
</datasource>