Demo application on OpenShift | Kitchensink quickstart shows off all the new features of Java EE 6, and makes a great starting point for your project.
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README.md

Kitchensink on OpenShift

This is the kitchensink JBoss quickstart app. You can find more info @ http://www.jboss.org/jdf/quickstarts/jboss-as-quickstart/guide/KitchensinkQuickstart/

Running on OpenShift

Create an account at https://www.openshift.com

Create a jbossas-7 application

rhc app create kitchensink jbossas-7 --from-code git://github.com/openshift/kitchensink-example.git

That's it, you can now checkout your application at:

http://kitchensink-$namespace.rhcloud.com

PostgreSQL as a backend

By default, this quickstart uses H2 as the backend, but you may use PostgreSQL.

To do this, add PostgreSQL cartridge to your application:

rhc cartridge add postgresql-8.4 -a kitchensink

Edit src/main/resources/META-INF/persistence.xml so that the data source points to java:jboss/datasources/PostgreSQLDS:

<jta-data-source>java:jboss/datasources/PostgreSQLDS</jta-data-source>

Commit this change, and push.