avassist可以用于反射获取方法参数名称，项目中用到，测试用例通过，当发布到tomcat时报错
javassist.NotFoundException: xxx.xxx.xxxService
javassist官网对此有如下说明：
The default ClassPool returned by a static method ClassPool.getDefault() searches the same path that the underlying JVM (Java virtual machine) has. If a program is running on a web application server such as JBoss and Tomcat, the ClassPoolobject may not be able to find user classes since such a web application server uses multiple class loaders as well as the system class loader. In that case, an additional class path must be registered to the ClassPool.
解决此异常的方法：解决此异常的方法：
1.（推荐）
ClassPool pool = ClassPool.getDefault();
ClassClassPath classPath = new ClassClassPath(this.getClass());
pool.insertClassPath(classPath);
ClassPool pool = ClassPool.getDefault();
pool.appendClassPath("E:\\xxx\\xxx\\target\\xxx_war\\WEB-INF\\lib\\xxx_jar-0.0.1-SNAPSHOT.jar");
2.更多参见：
http://www.csg.is.titech.ac.jp/~chiba/javassist/tutorial/tutorial.html