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The first call, find(), has to hit the database to initialize an Item instance. No proxies are allowed it s the equivalent of the Hibernate get() operation. The second call, getReference(), may return a proxy, but it doesn t have to which translates to load() in Hibernate. Because Hibernate proxies are instances of runtime generated subclasses of your entity classes, you can t get the class of an object with the usual operators. This is where the helper method HibernateProxyHelper.getClassWithoutInitializingProxy(o) is useful. Let s assume you have an Item instance into memory, either by getting it explicitly or by calling one of its properties and forcing initialization of a proxy. Your persistence context now contains a fully loaded object, as shown in figure 13.2. Again, you can see proxies in the picture. This time, these are proxies that have been generated for all *-to-one associations. Associated entity objects are not loaded right away; the proxies carry the identifier values only. From a different

perspective: the identifier values are all foreign key columns in the item s row. Collections also aren t loaded right away, but we use the term collection wrapper to describe this kind of placeholder. Internally, Hibernate has a set of smart collections that can initialize themselves on demand. Hibernate replaces your collections with these; that is why you should use collection interfaces only in your domain model. By default, Hibernate creates placeholders for all associations and collections, and only retrieves value-typed properties and components right away. (This is unfortunately not the default fetch plan standardized by Java Persistence; we ll get back to the differences later.)

public void setFailOnError(boolean failOnError) { this.failOnError = failOnError; } public void execute() throws BuildException { if (failOnError) { throw new BuildException("oops!"); } log("success"); } }

Does lazy loading of one-to-one associations work Lazy loading for one-to-one associations is sometimes confusing for new Hibernate users. If you consider one-to-one associations based on shared primary keys (chapter 7, section 7.1.1, Shared primary key associations ), an association can be proxied only if it s constrained="true". For example, an Address always has a reference to a User. If this association is nullable and optional, Hibernate first would have to hit the database to find out whether a proxy or a null should be applied the purpose of lazy loading is to not hit the database at all. You can enable lazy loading through bytecode instrumentation and interception, which we ll discuss later.

We recommend that failure on error be set by default, forcing a build file writer to explicitly turn off build failure if desired. This is consistent with the design of most built-in Ant tasks, although unfortunately, there are some exceptions.

A proxy is initialized if you call any method that is not the identifier getter method, a collection is initialized if you start iterating through its elements or if you call any of the collection-management operations, such as size() and contains(). Hibernate provides an additional setting that is mostly useful for large

The Ant codebase contains not only the source code to Ant s core and optional tasks, but also a growing number of JUnit test cases that help to verify that coding changes do not break expected functionality. Presently the Ant binary distribution does not ship with the base test case class or the testing infrastructure, but it is freely available through Ant s CVS repository. Since our recommended design of Ant tasks is to wrap existing functionality inside an Ant task fa ade, it is easier and more straightforward to write unit tests against the underlying API being wrapped. However, you may desire to unit test sufficiently sophisticated Ant tasks. The best source of this information is to access Ant s CVS repository and use the org.apache.tools.ant.BuildFileTest base class. Ant s own build file has the <junit> task to execute the test cases. Test cases can be written to assert that certain messages are logged, properties have expected values, or that a BuildException is thrown when expected.

collections; they can be mapped as extra lazy. For example, consider the collection of bids of an Item:

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