Thank you for helping me.
I replaced the file "server/default/deploy/hsqldb-ds.xml" with the file named "jbpm-ds.xml", in the same directory.
The content of the jbpm-ds.xml file is:
<code>
<?xml version="1.0" encoding="UTF-8"?>
<datasources>
<local-tx-datasource>
<jndi-name>DefaultDS</jndi-name>
<connection-url>jdbc:oracle:thin:@127.0.0.1:1521:xe</connection-url>
<driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
<user-name>BPM</user-name>
<password>BPM</password>
<min-pool-size>1</min-pool-size>
<max-pool-size>5</max-pool-size>
<idle-timeout-minutes>0</idle-timeout-minutes>
<track-statements/>
<!--
<security-domain>HsqlDbRealm</security-domain>
-->
<prepared-statement-cache-size>32</prepared-statement-cache-size>
<!-- metadata -->
<!-- type-mapping>Hypersonic SQL</type-mapping -->
<!-- /metadata -->
<!-- depends>jboss:service=Hypersonic,database=jbpmDB</depends -->
</local-tx-datasource>
<!-- mbean code="org.jboss.jdbc.HypersonicDatabase"
name="jboss:service=Hypersonic,database=jbpmDB">
<attribute name="Database">jbpmDB</attribute>
<attribute name="InProcessMode">true</attribute>
</mbean -->
</datasources>
</code>
Related with the problem, in the log "server.log" the next line was written:
<code>
INFO [ConnectionFactoryBindingService] Bound ConnectionManager 'jboss.jca:service=DataSourceBinding,name=DefaultDS' to JNDI name 'java:DefaultDS'
</code>
Best regards,
Ricardo