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IOC is not a new concept and has been around for a long time. EJBs, for example, supports IOC. The various EJB components such as session, entity, and message-driven beans lay down specific contracts with the container by implementing the methods defined in different interfaces. The session bean, for example, implements the ejbActivate and ejbPassivate life-cycle methods defined in the javax.ejb.SessionBean interface. However, these methods are never called from other methods of the session bean; rather, the container calls these methods at different times during the life cycle of the bean, thus inverting control. Message-driven beans, for instance, implement the onMessage method of the javax.jms.MessageListener interface. It is the responsibility of the container to invoke this method on the event of a message arrival.

Like their SQL counterparts, JP QL bulk UPDATE and DELETE statements are designed to make changes to large numbers of entities in a single operation without requiring the individual entities to be retrieved and modified using the entity manager. Unlike SQL, which operates on tables, JP QL UPDATE and DELETE statements must take the full range of mappings for the entity into account. These operations are challenging for vendors to implement correctly, and as a result, there are restrictions on the use of these operations that must be well understood by developers. The full syntax for UPDATE and DELETE statements is described in 8. The following sections will describe how to use these operations effectively and the issues that may result when used incorrectly.

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Now that you know the basic building blocks of JPA, we are ready to organize the pieces into an application that runs in Java SE. The only thing left to discuss is how to put it together so that it runs.

It is common for developers to believe that IOC and DI are the same thing. This is incorrect, and I want to make it clear right at the outset that they are two different yet related concepts. Just as IOC deals with inverting the control flow in an application, DI describes how one object resolves or finds other objects on which it needs to invoke some methods. There are several ways to achieve DI, and one such strategy is IOC. I will explain the different DI strategies one by one in the next few sections.

2. Java objects requiring no special treatment to be stored are often referred to as Plain Old Java Objects, or POJOs for short. This is really just to provide a handy term to differentiate them from Entity Beans and the like, which must conform to complicated and limiting contracts. The name also conveys something of the benefits of Hibernate you don t have to do anything special to support persistence of a POJO via Hibernate, so you really can reuse your existing Java objects.

The configuration that describes the persistence unit is defined in an XML file called persistence.xml. Each persistence unit is named, so when a referencing application wants to specify the configuration for an entity it needs only to reference the name of the persistence unit that defines that configuration. A single persistence.xml file can contain one or more named persistence unit configurations, but each persistence unit is separate and distinct from the others, and they can be logically thought of as being in separate persistence.xml files.

Direct Instantiation Direct instantiation is the simplest form of DI. The dependent object is directly instantiated using the new operator, as shown in Listing 2-1.

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