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<path id="axis.classpath"> <fileset dir="${axis.dist.dir}"> <include name="**/*.jar"/> </fileset> <fileset dir="${xercesxalan.dist.dir}"> <include name="*.jar"/> </fileset> </path> <target name="import-wsdl" depends="fetch-wsdl"> <java classname="org.apache.axis.wsdl.WSDL2Java"

package auction.persistence; import org.hibernate.mapping.*;

fork="true" failonerror="true" classpathref="axis.classpath" > <arg file="${fetched.dir}/api.wsdl"/> <arg value="--output"/> <arg file="${generated.dir}"/> <arg value="--verbose"/> <arg value="--package"/> <arg value="soapapi"/> </java> </target>

import org.hibernate.dialect.Dialect; import org.hibernate.engine.Mapping; public class CustomDDLExtension extends AbstractAuxiliaryDatabaseObject { public CustomDDLExtension() { addDialectScope("org.hibernate.dialect.Oracle9Dialect"); } public String sqlCreateString(Dialect dialect, Mapping mapping, String defaultCatalog, String defaultSchema) { return "[CREATE statement]"; } public String sqlDropString(Dialect dialect, String defaultCatalog, String defaultSchema) { return "[DROP statement]"; } }

This target runs the org.apache.axis.wsdl.WSDL2Java program to convert the WSDL interface description into Java source. We do this with <java>, taking care to set up the classpath to include all the files in the Axis lib directory. We also had to add an XML parser to the classpath, so we include Xerces in the path. The alternative approach is to add the Ant classpath to the <java> call, but we prefer to keep things self-contained. We also run the class in a new JVM, so that if the program returns an error by calling System.exit(), we get an exit code instead of the sudden death of Ant. The parameters to the task tell WSDL2Java to create classes from the downloaded WSDL file, into the package soapapi, into the directory build/generated. The result of the build, with many long lines wrapped to make them readable is:

You can add dialect scopes programmatically and even access some mapping information in the sqlCreateString() and sqlDropString() methods. This gives you a lot of flexibility regarding how you create and write your DDL statements. You have to enable this custom class in your mapping metadata:

<database-object> <definition class="auction.persistence.CustomDDLExtension"/> <dialect-scope name="org.hibernate.dialect.OracleDialect"/> </database-object>

import-wsdl: [java] Parsing XML file: build/fetched/api.wsdl [java] Generating portType interface: build/generated/soapapi/StockQuoteService.java [java] Generating client-side stub: build/generated/soapapi/StockQuoteServiceSoapBindingStub.java [java] Generating service class: build/generated/soapapi/StockQuoteServiceService.java [java] Generating service class: build/generated/soapapi/StockQuoteServiceServiceLocator.java [java] Generating fault class: build/generated/soapapi/Exception.java BUILD SUCCESSFUL

Summary

The program generated Java proxy classes for the endpoint. Let s look at them to see how we can use them. What WSDL2Java creates The target creates five Java classes that implement the client-side proxy to this service, and one interface listing the methods offered by the remote service:

In this chapter, we looked at issues that you may run into when you have to deal with a legacy database schema. Natural keys, composite keys, and foreign keys are often inconvenient and need to be mapped with extra care. Hibernate also offers formulas, little SQL expressions in your mapping file, that can help you to deal with a legacy schema you can t change. Usually, you also rely on Hibernate s automatically generated SQL for all create, read, update, and delete operations in your application. In this chapter,

/** * StockQuoteService.java *

Summary

you ve learned how to customize this SQL with your own statements and how to integrate Hibernate with stored procedures and stored functions. In the last section, we explored the generation of database schemas and how you can customize and extend your mappings to include all kinds of constraints, indexes, and arbitrary DDL that your DBA may recommend. Table 8.1 shows a summary you can use to compare native Hibernate features and Java Persistence.

* This file was auto-generated from WSDL * by the Apache Axis Wsdl2java emitter. */ package soapapi; public interface StockQuoteService extends java.rmi.Remote { public float getQuote(java.lang.String symbol) throws java.rmi.RemoteException, soapapi.Exception; }

Table 8.1 Hibernate and JPA comparison chart for chapter 8 Hibernate Core Hibernate supports any kind of natural and composite primary key, including foreign keys to natural keys, composite primary keys, and foreign keys in composite primary keys. Hibernate supports arbitrary association join conditions with formula mappings and property references. Hibernate supports basic joins of secondary tables for a particular entity class. Hibernate supports trigger integration and generated property settings. Hibernate lets you customize all SQL DML statements with options in XML mapping metadata. Hibernate lets you customize SQL DDL for automatic schema generation. Arbitrary SQL DDL statements can be included in XML mapping metadata. Java Persistence and EJB 3.0 Standardized support is provided for natural and composite keys, equivalent to Hibernate.

The program also creates a proxy class that implements this interface and redirects it to a remote endpoint, and a locator class that finds the endpoint at run time and binds to it. 15.2.3 Using the SOAP proxy classes To use these generated classes, simply create a Java file that imports and invokes them: