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Adding a new Java class requires Java development experience, and the tools to compile the source and make a JAR file from the generated bytecodes. This is exactly the same development skill that anyone using Ant for Java development has, and as for the tools needed Ant and the Java SDK are all that is required. People overcoming their projects build problems wrote all the Ant tasks that come with Ant today. The time and effort those developers invested have benefited not only themselves, but all other Ant users. The same benefits apply to new tasks written, and extensions to existing classes. If the libraries are reused in one project or organization, the cost of development is soon covered; if they are shared with the rest of the Ant community, then not only do others benefit from the development, but also they can share the maintenance effort among themselves.

Automatic deletion of orphans saves you two lines of code two lines of code that are inconvenient. Without orphan deletion, you d have to remember all the Bid

New tasks can easily be added in Java The fact that it is easy to extend Ant with new classes is one of its core strengths. Often, someone will have encountered the same build step that you have and will have written the task to perform it, so you can just use their work. 1.2.1 An example project Figure 1.1 shows the conceptual view of an Ant build file as a graph of targets, each target containing the tasks. When the project is built, the Ant run time determines which targets need to be executed, and chooses an order for the execution that guarantees a target is executed after all those targets it depends on. If a task somehow fails, it signals this to the run time, which halts the build. This lets simple rules such as deploy after compiling be described, as well as more complex ones such as deploy only after the unit tests and JSP compilation have succeeded.

objects you wish to delete the code that removes an element from the collection is often in a different layer than the code that executes the delete() operation. With orphan deletion enabled, you can remove orphans from the collection, and Hibernate will assume that they re no longer referenced by any other entity. Note again that orphan deletion is implicit if you map a collection of components; the extra option is relevant only for a collection of entity references (almost always a <one-to-many>). Java Persistence and EJB 3.0 also support transitive state changes across entity associations. The standardized cascading options are similar to Hibernate s, so you can learn them easily.

Figure 1.1 Conceptual view of a build file. The project encompasses a collection of targets. Inside each target are task declarations, which are statements of the actions Ant must take to build that target. Targets can state their dependencies on other targets, producing a graph of dependencies. When executing a target, all its dependents must execute first.

The Java Persistence specification supports annotations for entity associations that enable cascading object manipulation. Just as in native Hibernate, each EntityManager operation has an equivalent cascading style. For example, consider the Category tree (parent and children associations) mapped with annotations:

@Entity public class Category { private String name; @ManyToOne public Category parentCategory; @OneToMany(mappedBy = "parentCategory", cascade = { CascadeType.PERSIST, CascadeType.MERGE } ) public Set<Category> childCategories = new HashSet<Category>(); ... }

< xml version="1.0" > <project name="OurProject" default="deploy"> <target name="init"> <mkdir dir="build/classes" /> <mkdir dir="dist" /> </target>

You enable standard cascading options for the persist() and merge() operations. You can now create and modify Category instances in persistent or detached state, just as you did earlier with native Hibernate:

<target name="compile" depends="init" > <javac srcdir="src" destdir="build/classes"/> </target> <target name="doc" depends="init" > <javadoc destdir="build/classes" sourcepath="src" packagenames="org.*" /> </target> <target name="deploy" depends="compile,doc" > <jar destfile="dist/project.jar" basedir="build/classes"/> <ftp server="${server.name}" userid="${ftp.username}" password="${ftp.password}"> <fileset dir="dist"/> </ftp> </target> </project>

Category computer = ... // Loaded in a previous persistence context Category laptops = new Category("Laptops"); Category laptopUltraPortable = new Category("Ultra-Portable"); Category laptopTabletPCs = new Category("Tablet PCs"); laptops.addChildCategory(laptopUltraPortable); laptops.addChildCategory(laptopTabletPCs); computer.setName("Desktops and Laptops"); computer.addChildCategory(laptops);