This illustration depicts an MDB interacting with an OracleAS JMS destination. There is a gray rectangle labeled "OC4J". Within this rectangle, there is a circle labeled "MDB" on the left, and a smaller rectangle labeled "Queue or Topic" on the right. There is a straight line connecting the circle and rectangle within the "OC4J" rectangle. Beneath the "OC4J rectangle, there is a circle labeled "Client", with an arrow from this circle to the "Queue or Topic" rectangle inside the "OC4J" rectangle.