I'm sort of new to the AOP scene and I haven't found much in spring documentation on intercepting protected methods or even if that was possible.

I have an example program that uses spring's AOP system and it appears that the cglib-modded classes do not forward protected method calls between instances of classes in the same package. From this, I gather that spring's AOP is not as transparent as it should be (assuming AOP was supposed to be transparent to start) or is this a side effect of the interface enforced development style? Conscious decision not to support this? Something else perhaps?

Code:
package org.sample.spring;

public class SimpleBean
{
	AnotherSimpleBean asb;
	
	public void setAsb(AnotherSimpleBean asb)
	{
		this.asb = asb;
	}
	
	public String getValue()
	{
		return this.asb.getComputedValue();
	}
}
Code:
package org.sample.spring;

public class AnotherSimpleBean
{
	private String value;

	public void setValue(String value)
	{
		this.value = value;
	}

	protected String getComputedValue()
	{
		return this.value + this.value;
	}
}
Code:
<?xml version="1.0"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http&#58;//www.springframework.org/dtd/spring-beans.dtd">

<beans>
	<bean id="simplebeanTarget" class="org.sample.spring.SimpleBean" singleton="false">
		<property name="asb">
			<ref bean="anothersimplebean"/>
		</property>
	</bean>
	<bean id="anothersimplebeanTarget" class="org.sample.spring.AnotherSimpleBean" singleton="false">
		<property name="value">
			<value>foobar</value>
		</property>
	</bean>

	<bean id="debugInterceptor" class="org.springframework.aop.interceptor.DebugInterceptor"/>

	<bean id="simplebean" class="org.springframework.aop.framework.ProxyFactoryBean">
		<property name="target"><ref bean="simplebeanTarget"/></property>
		<property name="proxyTargetClass"><value>true</value></property>
		<property name="interceptorNames">
			<list>
				<value>debugInterceptor</value>
			</list>
		</property>
	</bean>
	<bean id="anothersimplebean" class="org.springframework.aop.framework.ProxyFactoryBean">
		<property name="target"><ref bean="anothersimplebeanTarget"/></property>
		<property name="proxyTargetClass"><value>true</value></property>
		<property name="interceptorNames">
			<list>
				<value>debugInterceptor</value>
			</list>
		</property>
	</bean>

</beans>