I'm trying to use Spring AOP, so far it works fine when I proxy interfaces(i.e use JDK Dynamic proxy), but once I switched to proxy classes(i.e use CGLIB), all of the instance variable of the target classes become null during runtime.

Here is part of the app config:
------------------------------------------
<bean id="debugInterceptor" class="org.springframework.aop.interceptor.DebugInterceptor"/>

<bean id="myTestController"
class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target">
<ref local="myTestControllerTarget"/>
</property>
<property name="interceptorNames">
<list>
<value>debugInterceptor</value>
</list>
</property>
</bean>

<bean id="myTestControllerTarget" class="com.xxx.yyy">
<property name="someDelegate"><ref bean="someDelegate"/></property>

<property name="viewName">
<value>testName</value>
</property>
</bean>
-----------------------
when the method

protected ModelAndView handle(HttpServletRequest request,
         HttpServletResponse response, Object command,
         BindException errors) throws Exception


is invoked on myTestController, it calles:

someDelegate.doSth()

but because "someDelegate" is NULL, the app failed with NPE.