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UserTransaction transaction = ejbContext.getUserTransaction(); transaction.begin(); transaction.setTransactionTimeout( 30 ); //set value to 30 seconds // invoke business functions here transaction.commit();

In this chapter, we explored basic database concepts and introduced the objectrelational impedance problem. We reviewed ORM annotations such as @Table and @Column, and mapped some of the entities into database tables. We also reviewed the various types of primary key generation strategies as well as the mapping of composite primary keys. In addition, we examined the different types of relationships introduced in the previous chapter and showed you how to use JPA annotations such as @JoinColumn and @PrimaryKeyColumn to map those into database tables. You learned that manyto-many and unidirectional one-to-many relationships require association tables. We hope that the limitation to support unidirectional relationships using a target foreign key constraint will be addressed in a future release. We showed you the robust OO inheritance mapping features supported by JPA and compared their advantages and disadvantages. Of the three inheritance mapping strategies, using joined tables is the best from a design perspective. You should note, however, that we avoided some complexities in this chapter. First, we used field-based persistence in all of our code samples to keep them as short and simple as possible. Second, we only mentioned the most commonly used elements for the annotations featured in the chapter. We felt justified in doing so as most of the annotation elements we avoided are rarely used. We do encourage you to check out the full definition of all the annotations in this chapter available online at http://java.sun.com/products/persistence/javadoc-1_0-fr/javax/persistence/ package-tree.html. In the next chapter, you ll learn how to manipulate the entity and relationships we mapped in this chapter using the EntityManager API.

Persistence context and its scope Container- and application-managed entity managers Entity lifecycle and CRUD operations Detachment and merge operations Entity lifecycle listeners

public class MembershipFilter implements Filter { [...] private String subscriptionType; private String denyPage; public MembershipFilter() {} public void init(FilterConfig config) throws ServletException { subscriptionType = config.getInitParameter("subscriptionType"); denyPage = config.getInitParameter("denyPage"); } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { [...] // applies a treatment on the request // go on with the application of the filters chain.doFilter(request,response); [...]/ / applies a treatment on the response } public void destroy() {} }

In chapter 7 you learned how to develop the application domain model using JPA In chapter 8 you saw how domain objects and relationships are mapped to the database While the ORM annotations we explored in chapter 8 indicate how an entity is persisted, the annotations don t do the actual persisting This is performed by applications using the EntityManager interface, the topic of this chapter To use an analogy, the domain model annotated with ORM configuration is like a children s toy that needs assembly The domain model consists of the parts of the toy The ORM configuration is the assembly instructions While the assembly instructions tell you how the toy parts are put together, you do the actual assembly The EntityManager is the toy assembler of the persistence world It figures out how to persist the domain by looking at the ORM configuration.

The timeout value for container-managed transaction beans comes from the EJB container itself. Your vendor s documentation should explain how to set this value.

More specifically, the EntityManager performs CRUD (Create, Read, Update, Delete) operations on domain objects The Read part includes extremely robust search and retrieval of domain objects from the database This chapter covers each of the CRUD operations that the EntityManager provides, with the exception of the search part of search and retrieval In addition to simple primary key based domain object retrieval, JPA provides SQL SELECT like search capabilities through the EJB 3 query API The query API is so extensive and powerful that we ll dedicate chapter 10 to it while briefly touching on it in this one Before we dive down into the persistence operations, you ll learn about the EntityManager interface, the lifecycle of entities, the concept of persistence context, and how to obtain an instance of EntityManager We ll discuss entity lifecycle callback listeners before concluding with best practices.