spring aop @target 和@within 抛出 IllegalAccessError

Question

当运行应用时，抛出IllegalAccessError，应用运行失败

这里使用了demo aop、service、annotation，一个简单的annotation和@Before advice，同时启用@EnableAspectJAutoProxy

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface MethodInterceptAnnotation {
}

@Component
@Aspect
public class MethodInterceptAop {
    @Before("@target(com.example.demo.aop.MethodInterceptAnnotation)")
    public void beforeCheck() {
        System.out.println("before check");
    }
}

public interface UserService {
    String getUserName(int a);
}

@Service
public class UserServiceImpl implements UserService {
    @MethodInterceptAnnotation
    public String getUserName(int age) {
        System.out.println("age:" + age);
        return age + "";
    }
}

改@target为@within再次报错，但是把@target改成@annotation一切正常

这里是部分堆栈跟踪

Caused by: org.springframework.cglib.core.CodeGenerationException: java.lang.IllegalAccessError-->class org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat$$EnhancerBySpringCGLIB$$e5c9e457 cannot access its superclass org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:538) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.apply(AbstractClassGenerator.java:110) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.apply(AbstractClassGenerator.java:108) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.internal.LoadingCache.call(LoadingCache.java:54) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_201]
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205) ~[spring-aop-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    ... 37 common frames omitted
Caused by: java.lang.IllegalAccessError: class org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat$$EnhancerBySpringCGLIB$$e5c9e457 cannot access its superclass org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat
    at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_201]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_201]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:535) ~[spring-core-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    ... 51 common frames omitted

任何人都知道这段代码有什么问题，在此先感谢。

Answer 1

来自文档：Supported Pointcut Designators

@target: Limits matching to join points (the execution of methods when using Spring AOP) where the class of the executing object has an annotation of the given type.

@within: Limits matching to join points within types that have the given annotation (the execution of methods declared in types with the given annotation when using Spring AOP).

@target 和 @within 建议类型都适用于 class/type 。

切入点的范围是全局的，当应用程序启动时，它会尝试识别所有带有注释的 classes/types 并干扰不需要的 classes ，这里 EmbeddedTomcat 相关。

要使 @target 和 @within 建议类型起作用，请尝试通过如下添加范围指示符来缩小范围

@Before("@target(com.example.demo.aop.MethodInterceptAnnotation) && within(com.example.demo..*)")

对我来说，缩小范围一直很有效，但我遇到了来自@kriegaex 的 SO where that too did not help. In that case , resolution for your issue is available in this answer。

请仔细阅读答案和评论以了解使用 @annotation 时的区别。总而言之，建议类型 @target 和 @within 在使用时倾向于为所有 classes 创建代理，而不管注释是否存在于 class 级别。

希望这对您有所帮助。

spring aop @target 和@within 抛出 IllegalAccessError

spring aop @target and @within throw IllegalAccessError

spring-aop

spring-boot