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Rows in two tables related by a primary key association share the same primary key values. The main difficulty with this approach is ensuring that associated instances are assigned the same primary key value when the objects are saved. Before we try to solve this problem, let s see how you map the primary key association. Mapping a primary key association with XML The XML mapping element that maps an entity association to a shared primary key entity is <one-to-one>. First you need a new property in the User class:

The task tries hard to bring the <javac> experience to the C and C++ world. It comes close to this with its automatic inclusion of all the source files in a directory tree, and its dependency checking. This avoids your having to replicate the makefile practice of listing naming dependencies, yet still gives you fast compilation. The other feature of the task is cross-platform support. It does as well as it can here, given how radically different the build process is for different platforms and different tools. They have tried hard to stop things from getting too ugly, but it is still complicated. One of the hardest parts of this portability problem is that you do need to code and test your build on all platforms you intend to support. Furthermore, if you are using any but the most basic compiler options, you need to work out the specific options for every compiler and linker you intend to support. This makes the <cc> task more complicated to use than most other Ant tasks. However, it is attempting to describe the entire native code build process for multiple platforms and tools in a single nested task:

public class User { ... private Address shippingAddress; // Getters and setters }

<cc debug="false" link="executable" outfile="dist/application" objdir="build/objects" multithreaded="true" exceptions="true" > <compiler name="msvc" if="use-msvc"/> <compiler name="gcc" if="use-gcc"/> <fileset dir="src/cpp" includes="*.cpp"/> <linker name="msvc" if="use-msvc"/> <linker name="gcc" if="use-gcc"/> <syslibset libs="kernel32,user32"/> </cc>

Next, map the association in User.hbm.xml:

You add a cascading option that is natural for this model: If a User instance is made persistent, you usually also want its shippingAddress to become persistent. Hence, the following code is all that is needed to save both objects:

This single task declaration will build an application with the GNU and Microsoft tool suites, enabling multithreading and exceptions in the code, and producing a release build (debug="false"). That is quite an impressive achievement for 15 lines of XML. We will return to the details if this task after exploring how we can use it in our JNI project.

User newUser = new User(); Address shippingAddress = new Address(); newUser.setShippingAddress(shippingAddress); session.save(newUser);

Java calls out to native libraries through JNI. This is a complex and powerful mechanism, so complex that whole books are needed to cover the subject adequately, and there are projects in the SourceForge Java foundry devoted to making it easier (specifically, JNI++). We do not want to get into these details, merely explore how to build and test JNI code inside Ant.

Hibernate inserts a row into the USERS table and a row into the ADDRESS table. But wait, this doesn t work! How can Hibernate possibly know that the record in the ADDRESS table needs to get the same primary key value as the USERS row At the beginning of this section, we intentionally didn t show you any primary-key generator in the mapping of Address. You need to enable a special identifier generator. The foreign identifier generator If an Address instance is saved, it needs to get the primary key value of a User object. You can t enable a regular identifier generator, let s say a database sequence. The special foreign identifier generator for Address has to know where to get the right primary key value. The first step to create this identifier binding between Address and User is a bidirectional association. Add a new user property to the Address entity:

Steps to building a JNI library The JNI core concept is that Java methods declared with the prefix native are bound to native libraries, libraries that are then dynamically loaded by the Java runtime. On Windows the native libraries are Dynamic Link Libraries (DLL), while on Unix shared libraries (.so) provide the same functionality. Other platforms have their own equivalents. To write a new JNI library, take the following steps:

public class Address { ... private User user; // Getters and setters }

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Map the new user property of an Address in Address.hbm.xml: