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Dependency checking While we are still waiting for XJavadoc to appear, we must make do with what we have. With XDoclet s current implicit reliance on Ant s <javadoc> task (which wraps Sun s javadoc command-line utility), the processing speed leaves a bit to be desired. Churning through Ant s own codebase and generating XML files for each of its tasks and a couple of properties files takes about 90 seconds. This is not the type of thing you would put on your main development build dependency graph. Internally, XDoclet does its own dependency checking, only regenerating files when needed, but it still goes through a lengthy javadoc phase to gather the complete model before deciding whether or not to regenerate files. There are a couple of solutions to this problem: Narrow the <fileset> processed by XDoclet to the smallest set of files necessary. Use <uptodate> to implement your own dependency checking and skip the entire process if the generated artifacts are newer than the source code.

You can think of the code in addBid() (a convenience method) as implementing a managed association in the object model! (We had more to say about these methods in chapter 3, section 3.2, Implementing the domain model. You may want to review the code examples there.) A basic mapping for this one-to-many association looks like this:

The dependency checking capabilities of XDoclet will no doubt improve dramatically as it gains popularity and widespread use. Using <uptodate> In the build for our Ant task subproject, we can bypass the XDoclet step by checking all source file timestamps against the generated taskdef.properties file. The "init" target contains our timestamp check:

If you compare this with the collection mappings earlier in this chapter, you see that you map the content of the collection with a different element, <one-tomany>. This indicates that the collection contains not value type instances, but references to entity instances. Hibernate now knows how to treat shared references and the lifecycle of the associated objects (it disables all the implicit dependent lifecycle of value type instances). Hibernate also knows that the table used for the collection is the same table the target entity class is mapped to the <set> mapping needs no table attribute. The column mapping defined by the <key> element is the foreign key column ITEM_ID of the BID table, the same column you already mapped on the other side of the relationship. Note that the table schema didn t change; it s the same as it was before you mapped the many side of the association. There is, however, one difference: The not null="true" attribute is missing. The problem is that you now have two different unidirectional associations mapped to the same foreign key column. What side controls that column At runtime, there are two different in-memory representations of the same foreign key value: the item property of Bid and an element of the bids collection held by an Item. Suppose the application modifies the association, by, for example, adding a bid to an item in this fragment of the addBid() method:

<uptodate property="taskdef.uptodate" targetfile="${build.classes.dir}/${taskdef.properties}"> <srcfiles dir="${src.dir}" includes="**/*.java"/> <srcfiles dir="${template.dir}" includes="taskdef.template"/> </uptodate>

bid.setItem(item); bids.add(bid);

Our "taskdef" target uses conditional target execution by specifying an unless clause:

This code is fine, but in this situation, Hibernate detects two changes to the inmemory persistent instances. From the point of view of the database, only one value has to be updated to reflect these changes: the ITEM_ID column of the BID table. Hibernate doesn t transparently detect the fact that the two changes refer to the same database column, because at this point you ve done nothing to indicate that this is a bidirectional association. In other words, you ve mapped the same column twice (it doesn t matter that you did this in two mapping files), and Hibernate always needs to know about this because it can t detect this duplicate automatically (there is no reasonable default way it could be handled).

You need one more thing in the association mapping to make this a real bidirectional association mapping. The inverse attribute tells Hibernate that the collection is a mirror image of the <many-to-one> association on the other side:

The effect is that Ant only runs the XDoclet task when any file in the Java source is newer than our properties file. In a large project, we may want to be more selective in the patterns we pass to <uptodate>, so that Ant runs XDoclet only when relevant packages in the project have changed. In the example, we could restrict XDoclet to run only when files in the antbook.ant package were changed:

<class name="Item" table="ITEM"> ... <set name="bids" inverse="true"> <key column="ITEM_ID"/> <one-to-many class="Bid"/> </set> </class>