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We have explored the challenges of deploying to production servers, the subtle differences you may encounter, and the complications of working with operations-managed systems. We have shown how to create a deployment process driven by per-system and perapplication server configuration files that can deploy to different systems and application servers. This deployment process uses an install-time build file for each application server type; this file deploys the application onto the local system. The main build file has to decide which install and configuration files to upload, and then uses <ftp> or a similar tool to get them onto the machine. For automated deployment, Ant can make a <telnet> call and run the remote task from the local system. You can also install the software by running Ant on the server by hand, which permits alternative upload processes such as email and CD-ROM delivery. Ant s task suite for deployment is still growing, and we are optimistic for the future, but today deployment is usually a matter of putting together a sequence of <copy>, <get>, and <java> calls. We finished the chapter with a look at how to verify that deployment worked. When you are writing your deployment build files, we strongly encourage you to use this technique from the outset, as it is easy to do, and the price of having a broken deployment process is high. This chapter marks the end of our exploration of how to apply Ant to advanced development projects. Our next section goes one level deeper, looking at how to extend and customize Ant through writing new tasks, or changing existing ones. This is not hard to do, and gives you the power to address problems in Ant that would otherwise seem impossible.

<set name="bids" cascade="all, delete-orphan" inverse="true"> <key column="ITEM_ID"/> <one-to-many class="Bid"/> </set>

f you are pushing the limits of Ant s built-in capabilities, chapters 19 and 20 are for you. We first cover writing custom Ant tasks and the essentials of Ant s API. Then, we explore scripting inside Ant build files and, finally, creating your own build listeners, loggers, filter readers, mappers, and selectors. This section enables you to extend Ant to meet the specific needs of your projects.

You can now delete Bid objects by removing them from this collection for example, in detached state:

19.1 19.2 19.3 19.4 19.5 19.6 19.7 19.8 What exactly is an Ant task 468 Ant API primer 470 How tasks get data 474 Creating a basic Ant Task subclass 483 Operating on a fileset 485 Error handling 486 Testing Ant tasks 487 Executing external programs 487 19.9 19.10 19.11 19.12 19.13 Executing a Java program within a task 490 Supporting arbitrarily named elements and attributes 493 Building a task library 495 Supporting multiple versions of Ant 497 Summary 497

Item anItem = ... // Loaded in previous Session anItem.getBids().remove(aBid); anItem.getBids().remove(anotherBid); Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); session.saveOrUpdate(anItem); tx.commit(); session.close();

If you don t enable the delete-orphan option, you have to explicitly delete the Bid instances after removing the last reference to them from the collection:

You know that you are a serious Ant user when you start wanting to extend it through code. Although it seems an expert use of the tool, there is no need to feel intimidated. The word expert can bring into peoples minds visions of experts-only ski runs: steep and narrow descents where any failure results in life-threatening injuries. Ant is not like that. Extending it is an advanced use of the tool, but it is simple and painless. There comes a time in everyone s complex project where it suddenly becomes clear that Ant does not do everything you need to control the entire build. It may be that something minor is missing, such as being able to sleep for thirty seconds during installation or testing. It may be that something major is missing, like having no way to deploy EJB packages to the target application server. It may even be that a common Ant task does not work quite right. This happens to everyone and there is always a solution. Ant was designed to be extendible through Java classes, and it only takes a small amount of Java coding to write a new Ant task. If the problem lies in the actual Ant source itself, then the fact that an entire Ant source tree is a download away comes into play. If Ant does not work right, then it can be fixed. 467

Item anItem = ... // Loaded in previous Session anItem.getBids().remove(aBid); anItem.getBids().remove(anotherBid); Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); session.delete(aBid); session.delete(anotherBid); session.saveOrUpdate(anItem); tx.commit(); session.close();