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Reducing database operations directly improves performance of applications. But while using the EJB 3 JPA you don t directly write SQL since the SQL is generated by the persistence provider. At this point you re asking yourself, Then how you can reduce the database operations We re glad you asked Choosing the right fetch type In chapter 9 you learned that a relationship may either be eagerly or lazily loaded. Lazy loading leads to multiple SQL statements, whereas eager loading relates to a SQL JOIN statement and translates to unnecessary data. If you re using EJB 3, by default the associated entities are eagerly loaded when you have a one-to-one or many-to-one relationship, or lazily loaded when you have a one-to-many or manyto-many relationship. However, there may be several situations when you don t need a related entity, such as the BillingInfo for a given User, or a related ItemDetails for a specific Item. In such cases you can disable eager loading. There may also be situations when you want a related collection of entities to be loaded automatically, where a one-to-many relationship exists that forces you to switch to EAGER loading. We warn you to be very careful when turning on eager loading for one-to-many relationships. If you re not sure whether eager loading is the right strategy for your association, you may want to try setting eager loading in your JPQL query. Suppose you

want to eagerly load the BillingInfo for a User entity. We can use the FETCH clause with a JOIN like this:

read-only entity beans 107 reducing the clutter of unimplemented bean methods 139 reference, EJB 18 reflection 25 registerOutParameter 111 <relationship > 100 <relationship-role-source> 100 <relationships> 99 relationships cascading deletes 104 one-to-many 101 one-to-one 97 remote interfaces generated sample 42 generating 37

This query will eagerly load the BillingInfo object for User even if fetch mode is specified as LAZY in the association definition. Deferring database updates until the end of transactions By default the flush mode for EJB 3 is AUTO; that is, the EJB 3 persistence providers execute SQL statements to update the database at the end of the transaction and whenever a query is executed that may retrieve updated data. The persistence providers optimize SQL at the end of the transaction. You can control the database updates by using the EntityManager s flush method. Using flush in between a transaction may lead to multiple SQL statements. Excessive use of flush may degrade the performance of your application, so we recommend that you not use it unless you have exhausted all other options. You can optionally set the flush mode to COMMIT. This means that all updates are deferred until the end of the transaction. In this situation the EntityManager doesn t check for pending changes. You can set FlushMode for the EntityManager em as follows:

AspectJ is the AOP tool that supports the largest set of joinpoint types. We ll examine in this section the types of joinpoints supported by AspectJ, JAC, JBoss AOP, and Spring AOP. Method execution: All AOP tools support this except Spring, which supports transparent proxying. Method call: This type is supported by AspectJ and JBoss AOP. JAC does not support it. When programming applications with remote communications, however, the method calls can be intercepted by wrapping the client-side proxy, which is rather similar to a method call joinpoint. Spring supports transparent proxying, which can be seen as a method call pointcut. Constructor execution: All AOP tools except Spring support this type of joinpoint.

em.setFlushMode(FlushModeType.COMMIT)

sample JSP looking up a remote EJB 14 sample JSP using a local EJB 13 sample log output 251 SampleBean 178 SampleDataSourceBean 79 deployment descriptor 79 SampleMDB 203 saveHomeReference 22 saveReference 18 saving an EJB reference 18 SecureMDB 244 securing a message-driven bean 242 security 230 credentials 234

This will set FlushMode to COMMIT for all queries executed within the active persistence context. On the other hand, if you want to set FlushMode on a per-query basis, you can do this:

Query query = em.createNamedQuery("findAllItems"); query.setFlushMode(FlushModeType.COMMIT); List items = query.getResultList();

Inherited constructor execution: When a constructor calls a superconstructor, AspectJ can distinguish the execution of the current constructor from that of the inherited one Field read: AspectJ and JBoss AOP can weave aspects around this joinpoint type JAC and Spring do not support it directly However, JAC performs a bytecode analysis to detect methods that read fields Field write: This joinpoint type is similar to the field read type Exception: AspectJ can intercept the start of an exception catch block Neither JBoss AOP, JAC, nor Spring supports this joinpoint type However, they support some after throwing advice (exception handlers in JAC), which modularize the handling of an exception for all the joinpoints included in a pointcut.