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In Hibernate, a value type may define associations; it s possible to navigate from a value type instance to some other entity However, it s never possible to navigate from the other entity back to the value type instance Associations always point to entities This means that a value type instance is owned by exactly one entity when it s retrieved from the database; it s never shared At the level of the database, any table is considered an entity However, Hibernate provides certain constructs to hide the existence of a database-level entity from the Java code For example, a many-to-many association mapping hides the intermediate association table from the application A collection of strings (more accurately, a collection of value-typed instances) behaves like a value type from the point of view of the application; however, it s mapped to its own table.

<target name="make-war" depends="compile,make-webxml,index"> <war destfile="${warfile}" compress="false" webxml="${build.webinf.dir}/web.xml"> <classes dir="${build.classes.dir}"/> <webinf dir="${build.dir}" includes="index/**"/> <webinf dir="${struts.dir}/lib" includes="*.tld,*.dtd"/> <webinf dir="${build.webinf.dir}" includes="*.tld"/> <fileset dir="web"/> <lib dir="${antbook-common.dist.dir}" includes="antbook-common.jar"/> <lib dir="${struts.dist.dir}" includes="*.jar"/> <lib dir="${lucene.dist.dir}" includes="${lucene.jarname}"/> <lib dir="${log4j.dist.dir}" includes="log4j.jar"/> </war> </target>

Although these features seem nice at first (they simplify the Java code), we have over time become suspicious of them Inevitably, these hidden entities end up needing to be exposed to the application as business requirements evolve The many-to-many association table, for example, often has additional columns added as the application matures We re almost prepared to recommend that every database-level entity be exposed to the application as an entity class For example, we would be inclined to model the many-to-many association as two one-to-many associations to an intervening entity class We ll leave the final decision to you, however, and come back to the topic of many-to-many entity associations in the future chapters Entity classes are always mapped to the database using <class>, <union-subclass>, <subclass>, and <joined-subclass> mapping elements How are value types mapped You ve already met two different kinds of value type mappings: <property> and <component>.

This target to create the WAR file now includes at least four dependent libraries: our common classes, everything in the Struts distribution, the Lucene search engine, and the Log4j logging package. The equivalent target to create the unexpanded WAR file, for direct deployment to Tomcat, is getting even more complex enough so to make us reconsider using that tactic at all, even though it worked in chapter 6 as a preamble to deployment. From now on, we may want to use the <war> task to create the WAR file, then <unzip> to expand it before deploying. Although slower, it is easier:

The value type of a component is obvious: It s the class that is mapped as embeddable However, the type of a property is a more generic notion Consider this mapping of the CaveatEmptor User and email address:.

<property name="war.expanded.dir" location="${build.dir}/war" /> <target name="unwar" depends="make-war"> <unzip src="${warfile}" dest="${war.expanded.dir}"/> </target>

Let s focus on that type="string" attribute. You know that in ORM you have to deal with Java types and SQL datatypes. The two different type systems must be bridged. This is the job of the Hibernate mapping types, and string is the name of a built-in Hibernate mapping type.

The string mapping type isn t the only one built into Hibernate. Hibernate comes with various mapping types that define default persistence strategies for primitive Java types and certain JDK classes.

This target expands the WAR file into a directory in the build tree. The <unzip> task uses dependency checking, so after the first run it is quite fast. 12.2.3 Summary of taglib development with Ant As we have explained, taglibs are the best way to provide functionality to a JSP page. They are far better than scriptlets. It is a tricky process to get right, but Ant and XDoclet can take most of the manual labor out of the process. The <webdoclet> task supports more @jsp tags than we have covered. We are going to point you at the XDoclet documentation to cover these, as it would take another book to do complete justice to taglibs and XDoclet. We have shown you how to build the source and extract the metadata, then insert the generated tag library descriptor into your WAR file and its deployment descriptor, which are the roles of Ant in the process.