Because Meta Programming must be easy.

Warning

To use this feature, you must add CGLib to your classpath. If you use maven:
<dependency>
     <groupId>cglib</groupId>
     <artifactId>cglib-nodep</artifactId>
     <version>2.1_3</version>
 </dependency>
Or you can download it manually at http://repo2.maven.org/maven2/cglib/cglib-nodep/2.1_3/cglib-nodep-2.1_3.jar .