Head First EJB

Marking transactions in the DD

All beans must say whether they’re using bean- or container-managed transactions. For BMT beans, that’s it for the DD.

But for CMT beans that’s just the beginning.

Transaction-related DD info lives in two places

1. For both CMT and BMT beans:

   The <transaction-type> element in the <enterprise-beans> section

   

2. For CMT beans only:

   The <container-transaction> element in the <assembly-descriptor> section

   <assembly-descriptor>
     <container-transaction>
        <method>
           <ejb-name>MyBean</ejb-name>
           <method-name>bar</method-name>
        </method>
        <trans-attribute>Required</trans-attribute>
     </container-transaction>
   </assembly-descriptor>