# This example shows an example of a container managed object relational mapping (ORM - http://bit.ly/GKnZ04) exposed as a Enterprise Java Bean (EJB). ## The dependency AuctionItemService injected into AuctionItemExternalWorker is not a pure replacement for the new operator. i.e. An EJB is injected and not a simple class. ## When the method Auct…

AuctionItemExternalWorker.java

@Stateless
public class AuctionItemExternalWorker {
    @EJB
    AuctionItemService service;
    @EJB
    AuditServiceAudit audit;
    public void setMinBid(long bidId,long minBidCents) {
        audit.auditSetMinBid(bidId,minBidCents);
        service.setMinBid(bidId,minBidCents);
    }
}

AuctionItemService.java

@Stateless
public class AuctionItemService {
    @PersistenceContext(unitName = "AUCTION_STORE")
    private EntityManager em;

    public void setMinBid(long bidId,long minBidCents) {
        AuctionItem item = em.find(AuctionItem.class, bidId);
        if (item == null){
            throw new IllegalArgumentException("Unable to find bid with ID "+bidId);
        }
        item.setMinBidCents(minBidCents);
    }
}

AuditService.java

@Stateless
public class AuditServiceAudit {
    @PersistenceContext(unitName = "AUCTION_STORE")
    private EntityManager em;

    //This forces the audit to be in a separate transaction
    @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
    public void setMinBid(long bidId,long minBidCents) {
        em.persist(new AuctionItemAudit(bidId,minBidCents);
    }
}