You have to tell jboss portal to create a transaction around your portlet in
myapp.war/WEB-INF/jboss-portlet.xml like this:
| <portlet-app>
| <portlet>
| <portlet-name>UserPortlet</portlet-name>
| <transaction>
| <trans-attribute>Required</trans-attribute>
| </transaction>
| </portlet>
| </portlet-app>
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