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This build file contains one target that lists the order in which to build the subprojects. We ordered the targets to ensure that all predecessor targets are built before those that depend upon them. We could have placed the dependencies inside the subprojects themselves, so that calling the webapp project would cause it to build its direct dependents, tools and index, from a predecessors target:

The design of the Location class is equivalent to the Address class. You now have three classes, one entity, and two value types, all mapped to the same table. Now let s map components with JPA annotations. Annotating embedded classes The Java Persistence specification calls components embedded classes. To map an embedded class with annotations, you can declare a particular property in the owning entity class as @Embedded, in this case the homeAddress of User:

<project name="webapp" default="all"> <target name="all" depends="predecessors,dist"/> <target name="predecessors" /> <ant dir="../tools" inheritAll="false"/> <ant dir="../index" inheritAll="false"/> </target>

@Entity @Table(name = "USERS") public class User { ... @Embedded private Address homeAddress; ... }

But we rejected this approach for a two reasons: It couples projects too tightly. A subproject does not need to know where the components it needs came from, only that they are available. Sometimes you need to run a project against archived versions of its dependent components; hard coding the steps for generating the predecessor in the build file prevents this. Keeping the dependency rules inside the master build makes it easier to change them, to split subprojects, or change their order. It makes development builds faster. As an example, if you are working on the webapp project, you don t want to run the tools or index build files every time you run your own build file. The other projects have not changed, so there is no need to rebuild them Examining the master build With our master build file written, and run with -verbose for detailed output, we can see what the master build is doing. When in verbose mode, the <ant> task names the build files and targets it is invoking, using [default] when it is calling the default entry point for that file:

If you don t declare a property as @Embedded, and it isn t of a JDK type, Hibernate looks into the associated class for the @Embeddable annotation. If it s present, the property is automatically mapped as a dependent component.

This is what the embeddable class looks like:

[ant] calling target [default] in build file C:\AntBook\app\ant\build.xml ... [ant] calling target [default] in build file C:\AntBook\app\common\build.xml ... [ant] calling target [default] in build file C:\AntBook\app\tools\build.xml ...

@Embeddable public class Address { @Column(name = "ADDRESS_STREET", nullable = false) private String street; @Column(name = "ADDRESS_ZIPCODE", nullable = false) private String zipcode; @Column(name = "ADDRESS_CITY", nullable = false) private String city; ... }

[ant] calling target [default] in build file C:\AntBook\app\index\build.xml ... [ant] calling target [default] in build file C:\AntBook\app\webapp\build.xml ... BUILD SUCCESSFUL Total time: 1 minute 7 seconds

You can further customize the individual property mappings in the embeddable class, such as with the @Column annotation. The USERS table now contains, among others, the columns ADDRESS_STREET, ADDRESS_ZIPCODE, and ADDRESS_CITY. Any other entity table that contains component fields (say, an Order class that also has an Address) uses the same column options. You can also add a back-pointer property to the Address embeddable class and map it with @org.hibernate.annotations.Parent. Sometimes you ll want to override the settings you made inside the embeddable class from outside for a particular entity. For example, here is how you can rename the columns:

Just over a minute is a long time for an incremental build. The cause of the delays turns out to be that two build files are creating the index. Such duplication becomes obvious when you create a master build. We can fix this, but there are some other changes to make first. Enhancing the build files We d like to add some validation to the subproject build files, to verify that the files they need are present. We can do this by adding a validate target to each build file which will use a series of <available> tests to probe for needed files and classes. Another enhancement is more fundamental: we want to call different targets from the master build file, such as a global target clean. The quick and dirty solution would be to cut-and-paste our all target into the clean target:

@Entity @Table(name = "USERS") public class User { ... @Embedded @AttributeOverrides( { @AttributeOverride(name column @AttributeOverride(name column @AttributeOverride(name column }) private Address homeAddress; ... }