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Step 2 of this conversation can be executed repeatedly, if more than one image must be added. Let s implement this with an SFSB that uses Java Persistence and the EntityManager directly. A single SFSB instance is responsible for the whole conversation. First, here s the business interface:

public interface PlaceItem { public Item createItem(Long userId, Map itemData); public void addImage(String filename); public void submit(); }

Setting properties with the <property> task The <property> task allows build files to define their own sets of custom properties. The most common variants of creating properties are Name/value attributes Load a set of properties from a properties file Load environment variables Setting and using a simple property A typical development-versus-production build difference is in the enabling or disabling of debug mode on compilation. Since we want a single build file with a single <javac> task, we use a property to parameterize it. We define a property named build.debug and set its value to on (the value that <javac> uses on its debug attribute).

In the first step of the conversation, the user enters the basic item details and supplies a user identifier. From this, an Item instance is created and stored in the conversation. The user can then execute addImage() events several times. Finally, the user completes the form, and the submit() method is called to end the conversation. Note how you can read the interface like a story of your conversation. This is a possible implementation:

Ant is not the only build solution available. How does it fare in comparison to its competition and predecessors We ll compare Ant to its most widely used competitors: IDEs and Make.

@Stateful @TransactionAttribute(TransactionAttributeType.NEVER) public class PlaceItemBean implements PlaceItem { @PersistenceContext(type = PersistenceContextType.EXTENDED) private EntityManager em; private Item item; private User seller; public Item createItem(Long userId, Map itemData) { // Load seller into conversation seller = em.find(User.class, userId); // Create item for conversation item = new Item(itemData, seller); user.addItem(item); return item; } public void addImage(String filename) { item.getImages().add(filename); } @Remove @TransactionAttribute(TransactionAttributeType.REQUIRED) public void submit() { em.persist(item); } }

Integrated development environments The integrated development environment, or IDE, is the common development system for small projects IDEs are great for editing, compiling, and debugging code, and are easy to use It is hard to convince a user of a good IDE that they should abandon it for a build process based on a text file and a command line prompt There are, in fact, many good reasons to supplement an IDE with an Ant build process, extending rather than abandoning their existing development tools Several limitations of IDEs only become apparent as a project proceeds and grows First, the functionality of IDEs is limited: although they can compile and package code, it is hard to include testing and deployment into an IDE process This limits how much of the build process can be automated Second, it is hard to transfer one person s IDE settings to another user.

An instance of this stateful session bean is bound to a particular EJB client, so it also acts as a cache during the conversation. You use an extended persistence context that is flushed only when submit() returns, because this is the only method

that executes inside a transaction. All data access in other methods runs in autocommit mode. So em.find(User.class, userId) executes nontransactional, whereas em.persist(item) is transactional. Because the submit() method is also marked with @Remove, the persistence context is closed automatically when this method returns, and the stateful session bean is destroyed. A variation of this implementation doesn t call the EntityManager directly, but data-access objects.

Settings can end up tied to an individual s environment You can take someone s project and tweak it to work on your own system, but then it usually does not work on the original system Finally, IDE-based build processes do not scale If a project has a single deliverable, then an IDE can build it However, if the project consists of many different subcomponents, you need to build each project as its own IDE project Producing replicable builds is an important part of most projects, and it s risky to use manual IDE builds to do so Replication is difficult because of the multiple steps involved in pulling a tagged version of code from the repository and ensuring that the build environment is the same as it was for previous builds that may have been done by a different team member on a different machine.