Spring The AopProxyUtils#ultimateTargetClass does not work with classes that are annotated with @Configuration.

Does a class annotated with @Configuration not implement the SpringProxy interface?

test:

@Configuration
public class TestConfigurationClass {
}

and

@Component
public class TestComponentClass {
    @Transactional
    public void methods(){
    }
}

and

@SpringBootTest
class DemoApplicationTests {
    @Autowired
    TestConfigurationClass testConfigurationClass;
    @Autowired
    TestComponentClass testComponentClass;
    @Test
    void contextLoads() {
        Assertions.assertTrue(testComponentClass instanceof SpringProxy); //true
        Assertions.assertTrue(testConfigurationClass instanceof SpringProxy); //false
    }
}

Comment From: jhoeller

The SpringProxy interface is exclusively for AOP proxies, not for any kind of runtime subclassing. Configuration classes and lookup methods lead to a runtime subclass that replaces the original class, so technically not a proxy but rather a substitute.

If you'd like to determine the original class for any kind of CGLIB-generated subclass, consider ClassUtils.getUserClass instead.