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Consider this a good practice, because you can now easily see what metadata of this entity class is from the JPA specification and which tags are vendor-specific. You can also easily search your source code for org.hibernate.annotations and get a complete overview of all nonstandard annotations in your application in a single search result. If you switch your Java Persistence provider, you only have to replace the vendor-specific extensions, and you can expect a similar feature set to be available with most sophisticated solutions. Of course, we hope you ll never have to do this, and it doesn t happen often in practice just be prepared. Annotations on classes only cover metadata that is applicable for that particular class. However, you often need metadata at a higher level, for a whole package or even the whole application. Before we discuss these options, we d like to introduce another mapping metadata format. XML descriptors in JPA and EJB 3.0 The EJB 3.0 and Java Persistence standard embraces annotations aggressively. However, the expert group has been aware of the advantages of XML deployment descriptors in certain situations, especially for configuration metadata that changes with each deployment. As a consequence, every annotation in EJB 3.0 and JPA can be replaced with an XML descriptor element. In other words, you don t have to use annotations if you don t want to (although we strongly encourage you to reconsider and give annotations a try, if this is your first reaction to annotations). Let s look at an example of a JPA XML descriptor for a particular persistence unit:

Again, take note of package name and datatypes comparing PersonSearch to PersonSearchForm. The Timestamp datatype is represented simply as a String on a Struts form (validation occurs elsewhere). Generating the Struts form bean using XDoclet was accomplished with the template in listing 11.2 (XDoclet tags are in boldface).

< xml version="1.0" encoding="UTF-8" > <entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd" version="1.0"> <persistence-unit-metadata> <xml-mapping-metadata-complete/> <persistence-unit-defaults> <schema>MY_SCHEMA</schema> <catalog>MY_CATALOG</catalog> <cascade-persist/> </persistence-unit-defaults> </persistence-unit-metadata>

package <XDtPackage:packageOf><XDtClass:fullClassName/></XDtPackage:packageOf>; import import import import import javax.servlet.http.HttpServletRequest; org.apache.struts.action.ActionError; org.apache.struts.action.ActionErrors; org.apache.struts.action.ActionForm; org.apache.struts.action.ActionMapping;

<package>auction.model</package> <entity class="Item" access="PROPERTY" metadata-complete="true"> <attributes> <id name="id"> <generated-value strategy="AUTO"/> </id> </attributes> </entity> </entity-mappings>

This XML is automatically picked up by the JPA provider if you place it in a file called orm.xml in your classpath, in the META-INF directory of the persistence unit. You can see that you only have to name an identifier property for a class; as in annotations, all other properties of the entity class are automatically considered persistent with a sensible default mapping. You can also set default mappings for the whole persistence unit, such as the schema name and default cascading options. If you include the <xml-mappingmetadata-complete> element, the JPA provider completely ignores all annotations on your entity classes in this persistence unit and relies only on the mappings as defined in the orm.xml file. You can (redundantly in this case) enable this on an entity level, with metadata-complete="true". If enabled, the JPA provider assumes that all properties of the entity are mapped in XML, and that all annotations for this entity should be ignored. If you don t want to ignore but instead want to override the annotation metadata, first remove the global <xml-mapping-metadata-complete> element from the orm.xml file. Also remove the metadata-complete="true" attribute from any entity mapping that should override, not replace, annotations:

If the current public class <XDtClass:className/>Form extends ActionForm { method is a <XDtMethod:forAllMethods extent="concrete-type"> setter... <XDtMethod:ifHasMethod name="<XDtMethod:setterMethod/>" parameters="<XDtMethod:methodType/>"> <XDtType:ifIsOfType value="return-type" type="java.sql.Timestamp" extent="concrete-type"> Convert Timestamp private String <XDtMethod:propertyName/>; to String </XDtType:ifIsOfType> <XDtType:ifIsNotOfType value="return-type" type="java.sql.Timestamp" extent="concrete-type"> private <XDtMethod:methodType/> <XDtMethod:propertyName/>; </XDtType:ifIsNotOfType> </XDtMethod:ifHasMethod> </XDtMethod:forAllMethods>

<entity-mappings ...> <package>auction.model</package> <entity class="Item"> <attributes> <basic name="initialPrice" optional="false"> <column name="INIT_PRICE"/> </basic> </attributes> </entity> </entity-mappings>

<XDtMethod:forAllMethods extent="concrete-type"> <XDtMethod:ifHasMethod name="<XDtMethod:setterMethod/>" parameters="<XDtMethod:methodType/>"> <XDtType:ifIsOfType value="return-type" type="java.sql.Timestamp" extent="concrete-type"> void <XDtMethod:setterMethod/> (String <XDtMethod:propertyName/>) { this.<XDtMethod:propertyName/> = <XDtMethod:propertyName/>; } String <XDtMethod:getterMethod/> () { return <XDtMethod:propertyName/>; } </XDtType:ifIsOfType> <XDtType:ifIsNotOfType value="return-type" type="java.sql.Timestamp" extent="concrete-type"> void <XDtMethod:setterMethod/> (<XDtMethod:methodType/> <XDtMethod:propertyName/>) { this.<XDtMethod:propertyName/> = <XDtMethod:propertyName/>; } <XDtMethod:methodType/> <XDtMethod:getterMethod/> () { return <XDtMethod:propertyName/>; } </XDtType:ifIsNotOfType> </XDtMethod:ifHasMethod> </XDtMethod:forAllMethods>

Here you map the initialPrice property to the INIT_PRICE column and specify it isn t nullable. Any annotation on the initialPrice property of the Item class is

public void reset(ActionMapping mapping, HttpServletRequest request) { <XDtMethod:forAllMethods extent="concrete-type"> <XDtMethod:ifHasMethod name="<XDtMethod:getterMethod/>" parameters="<XDtMethod:methodType/>"> <XDtType:ifIsOfType value="return-type" type="java.lang.String" extent="concrete-type"> <XDtMethod:setterMethod/>(""); </XDtType:ifIsOfType>

ignored, but all other annotations on the Item class are still applied Also note that you didn t specify an access strategy in this mapping, so field or accessor method access is used depending on the position of the @Id annotation in Item (We ll get back to this detail in the next chapter) An obvious problem with XML deployment descriptors in Java Persistence is their compatibility with native Hibernate XML mapping files The two formats aren t compatible at all, and you should make a decision to use one or the other The syntax of the JPA XML descriptor is much closer to the actual JPA annotations than to the native Hibernate XML mapping files You also need to consider vendor extensions when you make a decision for an XML metadata format.

<XDtType:ifIsOfType value="return-type" type="java.lang.Number" extent="hierarchy"> <XDtMethod:setterMethod/>(null); </XDtType:ifIsOfType> <XDtType:ifIsOfType value="return-type" type="java.sql.Timestamp" extent="concrete-type"> <XDtMethod:setterMethod/>(""); </XDtType:ifIsOfType> <XDtType:ifIsOfType value="return-type" type="java.lang.Boolean" extent="concrete-type"> <XDtMethod:setterMethod/>(Boolean.FALSE); </XDtType:ifIsOfType> <XDtType:ifIsOfType value="return-type" type="boolean" extent="concrete-type"> <XDtMethod:setterMethod/>(false); </XDtType:ifIsOfType> </XDtMethod:ifHasMethod> </XDtMethod:forAllMethods> } }