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Only the identifier value of the department has any effect on the persistent state; the setDepartment(department) call is done for consistency: Otherwise, you d have to refresh the object from the database to get the department set after the flush. (In practice you can move all these details into the constructor of your composite identifier class.) An alternative approach is a <key-many-to-one>:

<class name="User" table="USER"> <composite-id name="userId" class="UserId"> <key-property name="username" column="USERNAME"/> <key-many-to-one name="department" class="Department" column="DEPARTMENT_ID"/> </composite-id> ... </class>

<target name="create-src-zipfile" depends="create-bin-zipfile"> <zip destfile="${srczipfile.path}"> <zipfileset src ="${zipfile.path}" excludes="doc/javadocs/**" /> <fileset dir="." includes="src/**" /> <fileset dir="." includes="xdocs/**" /> <fileset dir="." includes="*.xml" /> </zip> </target>

However, it s usually inconvenient to have an association in a composite identifier class, so this approach isn t recommended except in special circumstances. The <key-many-to-one> construct also has limitations in queries: You can t restrict a query result in HQL or Criteria across a <key-many-to-one> join (although it s possible these features will be implemented in a later Hibernate version). Foreign keys to composite primary keys Because USERS has a composite primary key, any referencing foreign key is also composite. For example, the association from Item to User (the seller) is now mapped with a composite foreign key. Hibernate can hide this detail from the Java code with the following association mapping from Item to User:

The target to create the source archive reuses most of the work the binary Zip file target has performed. It depends on the create-bin-zipfile target, and uses <zipfileset> to import all the content of the first Zip file except for the javadocs. Even when importing the contents of one Zip file into another, the fileset patterns can control what to import or omit. Alongside the binary files, we include the source, the documents in the xdocs directory, and any XML files in the base directory which means the build.xml file itself. The result is a file that runs out the box, but which contains the entire source and, of course, the build file. 6.4.3 Merging Zip files One addition to the <zip> task in Ant 1.5 is the <zipgroupfileset>. This is a nested fileset element that lets you list one or more Zip files whose entire contents will get pulled into the current Zip file. This could be useful when creating JAR files, as well as pure Zip files:

<many-to-one name="seller" class="User"> <column name="USERNAME"/> <column name="DEPARTMENT_ID"/> </many-to-one>

Zip file best practices Here are some tips to make creating Zip files easier: Copy all files you want to include in the JAR into one place before building. This makes it easier to test that the needed files have been copied. Leave compression enabled unless you have a particular reason not to. Don t distribute JAR files with a .zip extension. Some software publishers still do this, but it is an outdated approach and not entirely compatible with Ant s classloader policies.

Any collection owned by the User class also has a composite foreign key for example, the inverse association, items, sold by this user:

Use the <zipfileset> element to produce a more robust build file. Remember that Unix file permissions are not retained: this needs to be documented on your download page. Our final observation is that many people can use the Zip format for Unix installations too, so you should include the Unix documents and scripts alongside the Windows ones, with a note listing all scripts that need to have their execute bit set.

<set name="itemsForAuction" inverse="true"> <key> <column name="USERNAME"/> <column name="DEPARTMENT_ID"/> </key> <one-to-many class="Item"/> </set>

Note that the order in which columns are listed is important and should match the order in which they appear in the <composite-id> element of the primary key mapping of User. This completes our discussion of the basic composite key mapping technique in Hibernate. Mapping composite keys with annotations is almost the same, but as always, small differences are important. Composite keys with annotations The JPA specification covers strategies for handling composite keys. You have three options: