<ejb-jar>
   <description>Auction System Beans</description>
   <enterprise-beans>
      ...
   </enterprise-beans>
   <assembly-descriptor>
      <container-transaction>
         <method>
            <ejb-name>Bid</ejb-name>
            <method-name>*</method-name>
         </method>
         <trans-attribute>Required</trans-attribute>
      </container-transaction>
      ...
   </assembly-descriptor>
</ejb-jar>