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Properties marked as database-generated must additionally be noninsertable and nonupdateable, which you control with the insert and update attributes. If both are set to false, the property s columns never appear in the INSERT or UPDATE statements the property value is read-only. Also, you usually don t add a public setter method in your class for an immutable property (and switch to field access). With annotations, declare immutability (and automatic refresh) with the @Generated Hibernate annotation:

Migrating to Ant is mostly a matter of following a fairly simple and straightforward process. The ten steps of migration are listed in table 9.2.

@Column(updatable = false, insertable = false) @org.hibernate.annotations.Generated( org.hibernate.annotations.GenerationTime.ALWAYS ) private Date lastModified;

Table 9.2 Steps to migrate an existing project to Ant Purpose Check everything in for safety, and tag it with a BEFORE_ANT label. Clean out the old .class files to prevent confusion; copy the old JAR files somewhere for safety. There should be no generated files in the project at this point. From examining your existing build tool, make a list of your project outputs and the stages in creating them; build a list of Ant targets and dependencies from this. Define your directory structure and the property names used to refer to these different directories. Make an initial design of your build file, or reuse an existing one. If you need to place the source into new directories, do so now. Create the build file that you have defined, or customize one you are reusing. Run the build, verify that it is working with the -verbose flag. Start writing tests if there were none already. Add more targets as you need them.

The settings available are GenerationTime.ALWAYS and GenerationTime.INSERT, and the equivalent options in XML mappings are generated="always" and generated="insert". A special case of database-generated property values are default values. For example, you may want to implement a rule that every auction item costs at least $1. First, you d add this to your database catalog as the default value for the INITIAL_PRICE column:

create table ITEM ( ... INITIAL_PRICE number(10,2) default '1', ... );

3. Determine the deliverables 4. Define directories 5. Design the build file 6. Arrange the source 7 Implement the . build file 8. Run a verbose build 9. Add some tests 10. Evolve the build file

If you use Hibernate s schema export tool, hbm2ddl, you can enable this output by adding a default attribute to the property mapping:

Migration is slightly trickier than starting with a new project because the existing build process probably works. You need to bring the Ant build up quickly to an equivalent standard, without disrupting anyone else working on the project. You may also need to rearrange the source files and other directories; this makes the migration obvious to the rest of the team, and is the biggest single source of disruption. If the project is a simple IDE or makefile one, creating a JAR or two, you can consider the migration complete when the same files can be created with Ant. The rest of the Ant development tests, new deployment targets, and new deliverables are build file evolution, which are common in all Ant projects. During the life of the project, you should rarely need to edit the build file to include new source files, documents, or unit tests; they should all be accommodated automatically. If you do need to keep editing the build file for such changes, then something is wrong with your task declarations usually file path patterns. The only reasons for build file maintenance should be new deliverables, new processing steps, and refactorings to clean up the process, such as moving all hard-coded paths and filenames into properties for easier overriding. Such refactoring is when a working build is most likely to break; as with source, tests help verify that the changes worked. Testing after every little change is the key to a successful build file refactoring.

<class name="Item" table="ITEM" dynamic-insert="true" dynamic-update="true"> ... <property name="initialPrice" type="big_decimal"> <column name="INITIAL_PRICE" default="'1'" generated="insert"/> </property> ... </class>