Bytecode instrumentation for Hibernate using Maven

Lazy property loading for hibernate is nice when you're using complex formulas for calculating values. But it requires bytecode instrumentation or otherwise hibernate will ignore 'lazy="true"' on property element and load the value eagerly. Here's the snippet of my pom.xml that does the instrumentation:

    <build>
        <plugins>
            ...
            <!-- Bytecode insturmentation in order to enable lazy property loading by Hibernate. -->
            <plugin>
                <artifactId>maven-antrun-plugin</artifactId>
                <version>1.3</version>
                <executions>
                    <execution>
                        <id>Instrument domain classes</id>
                        <configuration>
                            <tasks>
                                <taskdef name="instrument" classname="org.hibernate.tool.instrument.javassist.InstrumentTask">
                                    <classpath>
                                        <path refid="maven.dependency.classpath" />
                                        <path refid="maven.plugin.classpath" />
                                    </classpath>
                                </taskdef>
                                <instrument verbose="true">
                                    <fileset dir="${project.build.outputDirectory}">
                                        <include name="com/example/domain/*.class" />
                                    </fileset>
                                </instrument>
                            </tasks>
                        </configuration>
                        <phase>process-classes</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>org.hibernate</groupId>
                        <artifactId>hibernate-core</artifactId>
                        <version>${hibernate.version}</version>
                    </dependency>
                    <dependency><!-- bytecode instrumentation library to use... note that cglib is deprecated -->
                        <groupId>org.javassist</groupId>
                        <artifactId>javassist</artifactId>
                        <version>${javassist.version}</version>
                    </dependency>
                    <dependency><!-- so that slf4j won't barf about missing binding -->
                        <groupId>org.slf4j</groupId>
                        <artifactId>slf4j-simple</artifactId>
                        <version>${slf4j.version}   </version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

Note that you'll have to define the versions of libraries that you're using (here are my values):

  <properties>
    <hibernate.version>3.6.7.Final</hibernate.version>
    <javassist.version>3.14.0-GA</javassist.version>
    <slf4j.version>1.6.1</slf4j.version>
  </properties>