Description

This project is the PoC of using Spring AOP and AspectJ PCW (post-compile weaving) at the same time

ControllerAspect works with MyController and creates Spring Proxy via CGLIB

ServiceAspect works with MyService and it modifies class-file at post-compile stage by adding necessary logic w/o proxies

AnnotationAspect exists to present how to test code with annotations controlled by aspects

All situations are covered by tests

Tips & Tricks

1. First part of magic is done with aop.xml:

<aspectj>
    <aspects>
        <aspect name="com.github.akazver.poc.aop.ServiceAspect"/>
        <aspect name="com.github.akazver.poc.aop.AnnotationAspect"/>
    </aspects>
</aspectj>

Second part is in the build.gradle:

[compileJava, compileTestJava].each {
    it.ajc.options.compilerArgs += ['-xmlConfigured', "${projectDir}/src/main/resources/aop.xml"]
}

The xmlConfigured AJC key is undocumented, but you can find all information you need on StackOverflow and other similar resources. This file tells AJC which aspect should be processed by it, other aspects will be on the Spring AOP side

2. If you have classes in unit-tests that need to be processed by aspects, then you have to explicitly point AJC to apply them in unit-test phase by adding this in build.gradle:

compileTestJava.ajc.options.aspectpath.from = sourceSets.main.output

This is also valid for integration-tests created with unbroken-dome/gradle-testsets-plugin, just change compileTestJava to compileIntegrationTestJava

3. You can't use required-args-constructor in non-Spring aspects to inject beans because they are singletons created by AspectJ with no-args-constructor and accessed via static methods. Inject dependencies with @Autowired and use Spring factory-methods to create beans like this:

@Log4j2
@Configuration
public class ApplicationConfig {

    @Bean
    public ServiceAspect serviceAspect() {
        return Aspects.aspectOf(ServiceAspect.class);
    }

}

Another way is to use @Configurable on aspect class + @EnableSpringConfigured on configuration to tell Spring that it needs to inject beans into unmanaged objects, but I couldn't make it work

4. There are plenty of other useful AJC options in the official documentation