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// business methods public AccountDetails getDetails() { try { loadCustomerIds(); } catch (Exception ex) { throw new EJBException("loadCustomerIds: " + ex.getMessage()); } return new AccountDetails(accountId, type,description,balance, creditLine, beginBalance, beginBalanceTimeStamp,customerIds); } public BigDecimal getBalance() { return balance; } public String getType() {return type; } [...] // other Account methods implementations // protocol to load related objects private void loadCustomerIds() throws Exception {} } This implementation is done as a regular POJO or JavaBean. It can be easily reused in its original form in the context of a framework or technology other than EJBs or JDBC. For instance, you can write an aspect that will make the object persistent through another framework such as Hibernate or Spring.

The Seller entity is retrieved using the find method, so it is already managed, and any changes to it are guaranteed to be transparently synchronized Recall from chapter 7 that there is a bidirectional one-to-many relationship between the Item and Seller entities This relationship is realized in listing 94 by setting the Seller using the itemsetSeller method Let s assume that the Seller entity is mapped to the SELLERS table Such a relationship between the Item and Seller entities is likely implemented through a foreign key to the SELLERSSELLER_ID column in the ITEMS table Since the Seller entity is already persisted, all the EntityManager has to do is set the SELLER_ID foreign key in the generated INSERT statement Examining the INSERT statement presented earlier, this is how the SELLER_ID value is set to 1.

Note that if the seller property of Item were not set at all, the SELLER_ID column in the INSERT statement would be set to NULL Things become a lot more interesting when we consider the case in which the entity related to the one we are persisting does not yet exist in the database This does not happen very often for one-to-many and many-to-many relationships In such cases, the related entity is more than likely already saved in the database However, it does occur a lot more often for one-to-one relationships For purposes of illustration, we ll stray from our ItemManager example and take a look at saving User entities with associated BillingInfo entities Recall that we introduced this unidirectional, one-to-one relationship in chapter 7 The method outlined in listing 9.

A message-driven bean does not control user access with security roles or method permissions. It receives JMS messages as the only form of access to the bean. Unauthorized (deceptive or phony) messages are a security problem encountered with this type of bean. Your message-driven beans need the ability to authenticate messages that trigger their functionality.

5 receives user information such as username, e-mail, as well as billing information such as credit card type and number, and persists both the User and related BillingInfo entities into the database..

public User addUser(String username, String email, String creditCardType, String creditCardNumber, Date creditCardExpiration) { User user = new User(); user.setUsername(username); user.setEmail(email); BillingInfo billing = new BillingInfo(); billing.setCreditCardType(creditCardType); billing.setCreditCardNumber(creditCardNumber); billing.setCreditCardExpiration(creditCardExpiration); user.setBillingInfo(billing); entityManager.persist(user); return user; }

Careful readers would have noted the use of the empty method loadCustomerIds at the end of the AccountPOJO class, which is used by the method getDetails. As the name suggests, loadCustomerIds loads the customer IDs that are related to the current account. It is not implemented in the business object but in the SQLAccount aspect (see the around advice of Listing 11-4). This is a common technique used to delegate the implementation of a function within a dedicated aspect, performed in two phases as described here: 1. You define one or several empty methods within an object. These methods define a generic but inactive protocol. 2. You implement these methods within aspects, by using around advice codes that replace the empty implementation by not calling proceed. This technique is more flexible and explicit than an object-oriented design based on inheritance, for instance. Within this book, we refer to this technique as the implicit protocol technique for three reasons: It defines a protocol as methods. This protocol is private to the object but can be made public, for example, within an interface that would be implemented by the object. Its implementation is implicitly handled by an external aspect. The following section uses this technique for object references resolving with research protocols similar to the loadCustomerIds method.