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If you are familiar with earlier versions of EJB, one of the first things you will notice in EJB 3 is that it is no longer necessary to capture EJB metadata in a deployment descriptor. EJB 3 lets you store your EJB metadata inside your bean source using JDK 5.0 annotations. This isn t to say that XML deployment descriptors have gone away; they are still alive and well, and are preferred by many developers over annotations. Using XML decouples the Java source from the EJB metadata, allowing the same entity or enterprise bean classes to be used in different contexts, where the context-specific information is captured in the XML and doesn t pollute the bean class. Many users will prefer to use annotations, though and to avoid wading into a religious war (vocal proponents on both sides abound), we suggest you choose for yourself. A simple rule we follow is this: if we need to decouple our entity and bean classes from their EJB 3 metadata, as when we want to use the same entity classes with two different entity inheritance strategies, we put our metadata in XML. Otherwise, we stick with annotations. And don t forget, you can always mix and match, relying on the firm policy that whenever metadata is specified for an element using both XML and annotations, the XML always wins. This allows any role (see the EJB Roles section later in the chapter) downstream of the bean developer to override metadata settings without having to update the Java source, since overrides can be applied exclusively to the XML descriptors.

I now have all of the components required to address the functional requirements of the site. I ll wrap up the process by adding and configuring the blocks for each of the pages on the site, as shown in Table 16-3.

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DNN allows you to put a module in any pane on any page as many times as you like. You need to keep track of which module you are working with, so that data from one module does not appear in another of the same type. This is accomplished with the ModuleID field. Leave this field alone. (It is OK to allow nulls.) You also need an ID that distinguishes one row from another. The ItemID value is automatically incremented when a new row is added. Since this is also the primary key, there cannot be any duplicates of this field. Therefore, every row is unique, which is what you want. You need to change the table as follows: 1. Delete the [Content] field. 2. Rename the CreatedByUser field to Punch_User, and check the Allow Nulls check box. 3. Rename the CreatedDate field to Punch_Date, and check the Allow Nulls check box. 4. Add a new field, name it Punch_Type, give it a data type of int, and check the Allow Nulls check box. Save the table. Your new table definition should look like the one shown in Figure 7-12.

behavior on an enterprise bean or an entity that is truly integral to its definition, such as the relationship type of an entity relationship field, or the transactional requirements of a method on a session bean. Anything that could reasonably be overridden, such as the name of the table that an entity maps to, or the details of a value generator used for populating the primary key on an entity, would go in the XML descriptor, where it can be specified at deploy time by an application assembler, perhaps in consultation with a database administrator. While there is no harm in specifying default values using annotations in the Java source file, this approach recognizes the difference between firm metadata that ought not to be modified, and loose metadata that may be freely modified without changing the behavior of the enterprise bean or entity.

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