Does order matter while injecting properties in ProxyFactoryBean - spring

Question

I am trying to inject the aspects in a service. For this service I am creating a proxied object using classic way.
I have written a bean- baseProxy of type (ProxyFactoryBean) which contains a list of all the required advices.
<bean id="baseProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="interceptorNames">
<list>
<value>methodInvocationAdvice</value>
</list>
</property>
</bean>
I am creating a proxy for the service like this :
<bean id="singproxy" parent="baseProxy">
<property name="target" ref="singtarget" />
<property name="targetClass" value="com.spring.learning.SingingService"></property>
</bean>
Which doesn't work but when I revert these two properties and write like this :
<bean id="singproxy" parent="baseProxy">
<property name="targetClass" value="com.spring.learning.SingingService"></property>
<property name="target" ref="singtarget" />
</bean>
To my surprise it works fine. In spring does it matter on the order for bean ? Or its a special case with ProxyFactoryBean?
I tried with Spring 3.0 I am not sure same behavior exists with previous versions.

Answer 1

Concerning target and targetClass, It's one or the other, but not both. Here's the relevant source (from org.springframework.aop.framework.AdvisedSupport), a parent class of ProxyFactoryBean:
public void setTarget(Object target) {
setTargetSource(new SingletonTargetSource(target));
}
public void setTargetSource(TargetSource targetSource) {
this.targetSource = (targetSource != null ? targetSource : EMPTY_TARGET_SOURCE);
}
public void setTargetClass(Class targetClass) {
this.targetSource = EmptyTargetSource.forClass(targetClass);
}
As you can see, both setTarget() and setTargetClass() write to the same field, so the last assignment wins.