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When talking about mapping objects to a relational database, persisting objects, or querying objects, the term entity should be used rather than objects. Objects are instances that just live in memory. Entities are objects that live shortly in memory and persistently in a database. They have the ability to be mapped to a database; they can be concrete or abstract; and they support inheritance, relationships, and so on. These entities, once mapped, can be managed by JPA. You can persist an entity in the database, remove it, and query it using a query language (Java Persistence Query Language, or JPQL). ORM lets you manipulate entities, while under the covers the database is being accessed. And, as you will see, an entity follows a defined life cycle. With callback methods and listeners, JPA lets you hook some business code to life-cycle events.

Listing 6-27 DateCommandBean Unit Test protected void setUp() throws Exception { bean = new DateCommandBean(); request = new MockHttpServletRequest(); binder = new ServletRequestDataBinder(bean, "bean"); } public void testBind() throws Exception { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); Date expected = dateFormatparse("2001-01-01"); CustomDateEditor dateEditor = new CustomDateEditor(dateFormat, true); binderregisterCustomEditor(Dateclass, dateEditor); requestaddParameter("date", "2001-01-01"); binderbind(request); assertEquals(expected, beangetDate()); // true! } The registerCustomEditor(Class, PropertyEditor) (shown in Listing 6-27) configures the DataBinder to use the PropertyEditor any time it encounters a property with the given Class A second form, registerCustomEditor(Class, String, PropertyEditor), (not shown in Listing 6-27) takes a third parameter, which is the full path name to a property If you specify the property name, the Class parameter can be null, but should be specified to ensure correctness.

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The principle of ORM is to delegate to external tools or frameworks (in our case, JPA) the task of creating a correspondence between objects and tables. The world of classes, objects, and attributes can then be mapped to relational databases made of tables containing rows and columns. Mapping gives an objectoriented view to developers who can transparently use entities instead of tables. And how does JPA map objects to a database Through metadata. Associated with every entity is metadata that describes the mapping. This metadata enables the persistence provider to recognize an entity and to interpret the mapping. This metadata can be written in two different formats: Annotations: The code of the entity is directly annotated with all sorts of annotations that are described in the javax.persistence package. XML descriptors: Instead of (or in addition to) annotations, you can use XML descriptors. The mapping is defined in an external XML file that will be deployed with the entities. This can be very useful when database configuration changes depending on the environment, for example.

cution key. As a result, the flow executor launches a new flow execution for this simple three-state flow. The flow progresses from the first state to the second state, a view state, and pauses. Before control is returned to the browser, the flow execution repository takes a snapshot of the FlowExecution and assigns it a unique key. This key is embedded in the rendered view to make sure a next request can submit it again. At the end of the first request, the continuation repository contains a flow execution continuation snapshot, snapshot1, indexed by key1.

If the property name points to a collection, then PropertyEditor is applied to the collection itself if the Class parameter is a collection, or to each element of the collection if the Class parameter is not a collection Working with PropertyEditors not supported in the default set requires a bit more work, but still results in a fairly simple setup You will first create an instance of the CustomDateEditor and provide it with your chosen DateFormat object The PropertyEditor is then registered with the DataBinder, assigning it to a class it will be responsible for converting (in this case, the Date class) After you register it, proceed as normal, and the CustomDateEditor will handle any property of type Date As you may guess, when you register a PropertyEditor with the DataBinder, that PropertyEditor is then used any time the Date class is encountered.

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