This example uses the connection factory jms/ConnectionFactory and the topic jms/Topic, both of which you used in A Java EE Application That Uses the JMS API with a Session Bean. It also uses the JDBC resource named jdbc/__default, which is enabled by default when you start the Application Server.
If you deleted the connection factory or topic, you can create them again using targets in the build.xml file for this example. Use the following commands to create the resources:
ant create-cf ant create-topic