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) to get to the base directory Listing 94 shows some of this build file, to give you a flavor of it It is primarily a list of file and directory locations We have not completely ruled out the option of including this file into a project in a lower level directory Careful property declaration enables a build file to define the master project base directory, by defining masterbuilddir before including the build file fragment through the entity reference We would interpret having to do that as a symptom that the project was getting even more complex, and would take steps to simplify the project structure, if possible Note that the shared property file lets users override subsequent definitions by defining their values in a properties file to be loaded before any other.

In subclasses, you don t need to specify the join column if the primary key column of the subclass table has (or is supposed to have) the same name as the primary key column of the superclass table:

Three such files are loaded: a per-application property file in the current directory, a per-user property file in their home directory, and a property file stored in the masterbuild directory 226.

@Entity public class BankAccount { ... }

This entity has no identifier property; it automatically inherits the BILLING_ DETAILS_ID property and column from the superclass, and Hibernate knows how

<target name="make-webxml" depends="compile"> <webdoclet sourcepath="${src.dir}" destdir="${build.webinf.dir}" mergedir="templates"> <classpath> <path refid="xdoclet.classpath"/> <pathelement location="${antbook-common.jar}"/> </classpath> <fileset dir="${src.dir}"> <include name="**/*.java" /> </fileset> <deploymentdescriptor servletspec="2.3" validatexml="true"> <welcomefile file="index.jsp"/> </deploymentdescriptor> <jsptaglib validatexml="true" destinationfile="antbook.tld"/> </webdoclet> </target>

to join the tables together if you want to retrieve instances of BankAccount. Of course, you can specify the column name explicitly:

This target contains one task declaration, <webdoclet>, which performs two services for our web application. First, it creates the web.xml file from files in the templates directory that the mergedir attribute is set to, adding any extra declarations we include inside the <deploymentdescriptor> element b. The latter tells <webdoclet> to create a web.xml deployment descriptor for version 2.3 of the servlet specification, and to validate the XML against the appropriate DTD. We add a declaration as a nested element, stating that files called index.jsp are to be served up when browsing to directories. The task scans the javadoc comments looking for @web tags, of which we have only one, declaring a servlet that the application server should run on startup:

@Entity @PrimaryKeyJoinColumn(name = "CREDIT_CARD_ID") public class CreditCard { ... }

/** *@web:servlet name="init" load-on-startup="1" */ public class InitServlet extends HttpServlet { // initialization code here }

Finally, this is the equivalent mapping in JPA XML descriptors:

The @web:servlet tag tells <webdoclet> to add a new servlet entry to the web.xml file, with the load-on-startup option set. Other tags that you can insert into the source let you declare filter classes (@web:filter), and many of the servlet configuration options. We are not listing these; consult the XDoclet documentation for their details. The reason we are not listing them is that we do not believe that the Java source is the appropriate place for the configuration options of a web application. Javadoc tags are appropriate for declaring what components you implement in the source, but not how they should be used.

<entity-mappings> <entity class="auction.model.BillingDetails" access="FIELD"> <inheritance strategy="JOINED"/> ... </entity> <entity class="auction.model.BankAccount" access="FIELD"/> <entity class="auction.model.CreditCard" access="FIELD"> <primary-key-join-column name="CREDIT_CARD_ID"/> </entity> </entity-mappings>

Before we show you when to choose which strategy, let s consider mixing inheritance mapping strategies in a single class hierarchy.

Returning to listing 12.2, the second function of the task is to generate tag library descriptors. With the single line c, the task generates the taglib antbook.tld at the same time it generates the servlet information. Minimizing the number of sweeps over the source is important for speed. By stating that the target depends upon the compile target, we ensure that the source does at least compile before we invest the time in running XDoclet. Adding an <uptodate> check will enable Ant to skip the entire target if the generated files (web.xml and antbook.tld) are newer than the source. When Ant executes the make-web target, the <webdoclet> task creates the file antbook.tld in the build/web/WEB-INF directory:

You can map whole inheritance hierarchies by nesting <union-subclass>, <subclass>, and <joined-subclass> mapping elements. You can t mix them for example, to switch from a table-per-class hierarchy with a discriminator to a normalized table-per-subclass strategy. Once you ve made a decision for an inheritance strategy, you have to stick to it. This isn t completely true, however. With some Hibernate tricks, you can switch the mapping strategy for a particular subclass. For example, you can map a class hierarchy to a single table, but for a particular subclass, switch to a separate table with a foreign key mapping strategy, just as with table per subclass. This is possible with the <join> mapping element:

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"> <taglib> <tlib-version>1.0</tlib-version> <jsp-version>1.2</jsp-version> <short-name></short-name> <tag> <name>happy</name> <tag-class>org.example.antbook.web.taglibs.HappyTag</tag-class> <body-content>empty</body-content> <attribute> <name>fail</name> <required>false</required> </attribute> <attribute> <name>verbose</name> <required>false</required> </attribute> </tag> </taglib>

<hibernate-mapping> <class name="BillingDetails" table="BILLING_DETAILS"> <id>...</id> <discriminator column="BILLING_DETAILS_TYPE" type="string"/>