Why is my AOP Aspect Not Invoked in Nested Method Calls?

Nested Method Calls and Spring AOP

Consider the following code in ABC.java:

<code class="java">public void method1() {
    // ...
    method2();
    // ...
}

public void method2() {
    // ...
    // ...
}</code>

Adding AOP to method2 involves creating an aspect, AOPLogger, containing a method for checking access, checkAccess. The Spring configuration includes:

<code class="xml"><bean id="advice" class="p.AOPLogger"></bean>
<config>
    <pointcut id="abc" expression="execution(*p.ABC.method2(..))"></pointcut>
    <aspect id="service" ref="advice">
        <before pointcut-ref="abc" method="checkAccess"></before>
    </aspect>
</config></code>

However, the aspect, checkAccess, is not invoked when method2 is called. What's missing?

AOP Proxies and Bean Injections

AOP works by applying aspects to proxies surrounding the bean. When a bean is referenced, it's not the instantiated class but a synthetic one that delegates to the actual class and adds functionalities like AOP.

In the example, method2 is called directly on the class. When injected as a Spring bean, the enclosing class is injected as its proxy, triggering the aspects on method calls.

To invoke AOP on nested method calls, consider the following options:

1. Bean Separation: Split method1 and method2 into separate beans.
2. Non-Spring AOP Framework: Utilize a non-Spring-oriented AOP framework for more granular control over aspect application.

The Spring documentation provides further details and potential workarounds.

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