[JAVA] How to unit test Spring AOP

Thing you want to do

I want to test a class with cross-business processing created by Spring AOP as a single unit.

How Spring AOP works (roughly) and problems during unit testing

Spring AOP is established based on DI, and the side that uses the component injects a proxy (not the bean itself registered in the container, but the extension of the function defined in AOP for that bean) instance. AOP is realized by. aop.png

However, since I want to do unit testing this time, I would like to provide a method for testing without starting the DI container and depending on the context.

Sample prepared this time

If there is null in the argument, implement the process of throwing NullPointerException in AOP and apply it to the method of TestService (test class) class. (The NullCheck annotation is just a marker, so I'll omit it here.)


public class AspectLogic {
	public Object invoke(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
		Stream.of(proceedingJoinPoint.getArgs()).forEach(Objects::requireNonNull);//Get all arguments and Objects::Check with requireNonNull
		return proceedingJoinPoint.proceed();


public class TestService {
	public void doSomething(Object arg) {

Get proxy from AspectJProxyFactory.

Let's implement the part where Spring DI gets proxy from Bean by ourselves. ʻ Instance of AspectJProxyFactory Add the Aspect class created this time to. If you hit the test sample method using the proxy obtained from the factory, it seems that you can confirm that the process defined in AOP is called andNullPointerException` is thrown.


public class TestAspectLogic {
	public void testAspect() {

		AspectJProxyFactory factory = new AspectJProxyFactory(new TestService());
		factory.addAspect(new AspectLogic()); //Apply AspectLogic class here
		TestService proxy = factory.getProxy();

		try {
		} catch(NullPointerException npe) {





Write a test for AOP as well.

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