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There are some things to note about listing 14.4: Keep the generated code separate from the code you write. We do this with temporary directories built by Middlegen and XDoclet and referenced in <ejbdoclet> and <javac>. Typically, Middlegen would not be an integral part of a build process because of its time-consuming nature on large schemas and because a build process should not generally require a database server to run. The Middlegen target could be made conditional on a flag, or taken out of the main dependency graph. Perhaps even the entity beans generated by Middlegen would be moved to the source code repository and only updated when the schema changes. Ant properties are used for everything that could conceivably need to be overridden, including the location for the EAR s application.xml file using ${application.xml}. Until XDoclet s dependency checking and speed improves, the xdoclet target should be made conditional on an <uptodate> set flag to ensure it is only run when needed.

<class name="Category" table="CATEGORY"> ... <property name="name"> <column name="CAT_NAME" unique-key="unique_siblings"/> </property> <many-to-one name="parent" class="Category"> <column name="PARENT_CATEGORY_ID" unique-key="unique_siblings"/> </many-to-one> ... </class>

You assign an identifier to the constraint with the unique-key attribute so you can refer to it several times in one class mapping and group columns for the same constraint. However, the identifier isn t used in the DDL to name the constraint:

If good source is as readable as a book, a good build file should be as readable as a booklet, including short, concise, and clear instructions on what the project creates and how it goes about creating these deliverables. In this section, we cover two aspects of managing Ant projects that become increasingly important as a project evolves.

create table CATEGORY ( ... CAT_NAME varchar(255) not null, PARENT_CATEGORY_ID integer, ... unique (CAT_NAME, PARENT_CATEGORY_ID) );

Remember, small projects become large projects, so keep these points in mind when you begin setting up a projects build process Refactoring should also be applied to build files, not just your Java source code In appendix D, we cover more general suggestions as to how to lay out a build file to be readable If you wish to diverge from these, then try to be consistent within all the build files you create We have derived these best practices from common uses, although there is no single standard for how to name directories and targets or structure a build file Even in the Apache Jakarta projects, there is little consistency on what to name the directory for distributable packages; both dist and target are used We encourage you to strive for greater consistency within your own team and organization.

If you want to create a unique constraint with annotations that spans several columns, you need to declare it on the entity, not on a single column:

Having a consistent layout across projects means that people can understand their way around your code, so adding new people to a team is easier It also makes it easier to cut and paste targets and tasks between projects, which is a common practice when starting up a new project The best approach is for an organization to have a set of template build files that can be used for different projects, or a collection of targets to bring together to form a build file 981 Managing libraries A particularly tricky situation arises in the management of external library dependencies These dependencies are typically third-party products, such as many of the fine Jakarta offerings These dependencies may also be in-house components that are built, packaged, and versioned for use in other projects.

@Entity @Table(name = "CATEGORY", uniqueConstraints = { @UniqueConstraint(columnNames = {"CAT_NAME", "PARENT_CATEGORY_ID"} ) } ) public class Category { ... }

With JPA XML descriptors, multicolumn constraints are as follows: