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Proxies are placeholders that are generated at runtime. Whenever Hibernate returns an instance of an entity class, it checks whether it can return a proxy instead and avoid a database hit. A proxy is a placeholder that triggers the loading of the real object when it s accessed for the first time:

} dir = null; } }

Item item = (Item) session.load(Item.class, new Long(123)); item.getId(); item.getDescription(); // Initialize the proxy

Using MatchingTask provides some nice freebies that mirror the <fileset> datatype:

The third line in this example triggers the execution of the SQL that retrieves an Item into memory. As long as you access only the database identifier property, no initialization of the proxy is necessary. (Note that this isn t true if you map the identifier property with direct field access; Hibernate then doesn t even know that the getId() method exists. If you call it, the proxy has to be initialized.)

A proxy is useful if you need the Item only to create a reference, for example:

includes/excludes attributes defaultexcludes attribute <include>/<exclude> / <includesfile> / <excludesfile> elements <patternset> element

Item item = (Item) session.load(Item.class, new Long(123)); User user = (User) session.load(User.class, new Long(1234)); Bid newBid = new Bid("99.99"); newBid.setItem(item); newBid.setBidder(user); session.save(newBid);

The one piece that you must provide in your own code is the directory to use with the implicit fileset. In our example we implemented a setDir method and required that a dir attribute be specified by throwing a BuildException in execute if it was not specified. The MatchingTask base class provides a getDirectoryScanner(File baseDir) method to get a DirectoryScanner instance, taking into account all the specified inclusion and exclusion rules. Although many Ant tasks are derived from MatchingTask, the current trend is away from this task; explicit filesets have proven to be more flexible. If you are writing your own task, the ease of using MatchingTask as a base class still makes it appealing. Tasks that extend from MatchingTask should only deal with a single implicit fileset. Tasks that need to support multiple nested filesets should extend from Task instead.

You first load two objects, an Item and a User. Hibernate doesn t hit the database to do this: It returns two proxies. This is all you need, because you only require the Item and User to create a new Bid. The save(newBid) call executes an INSERT statement to save the row in the BID table with the foreign key value of an Item and a User this is all the proxies can and have to provide. The previous code snippet doesn t execute any SELECT! If you call get() instead of load() you trigger a database hit and no proxy is returned. The get() operation always hits the database (if the instance isn t already in the persistence context and if no transparent second-level cache is active) and returns null if the object can t be found. A JPA provider can implement lazy loading with proxies. The method names of the operations that are equivalent to load() and get() on the EntityManager API are find() and getReference():

It is up to you, as a task developer, to decide how to handle abnormal conditions that may occur during the configuration or execution of your task. Ant will catch exceptions that are thrown from the task methods it invokes and make the build fail at that point. Throw Ant s org.apache.tools.ant.BuildException, which is a RuntimeException subclass, when you wish a build to fail for any reason. You may want the failure of a build to be user-specified, in which case a simple pattern to follow is adding a failonerror attribute similar to many of Ant s core tasks like <java>. Here is a simple Task class allowing the build file to control if a build failure occurs or not:

Item item = em.find(Item.class, new Long(123)); Item itemRef = em.getReference(Item.class, new Long(1234));

package org.example.antbook.tasks; import org.apache.tools.ant.Task; import org.apache.tools.ant.BuildException; public class ConditionalFailTask extends Task { private boolean failOnError = true;