aop:@within exception:java.lang.illegalargumentexception:引用的错误类型不是注解类型

dvtswwa3  于 2021-06-29  发布在  Java
关注(0)|答案(1)|浏览(475)

我是aop和aspectj的新手。我正试图围绕元素类型的自定义注解编写一个自定义逻辑 TYPE . 我还想使用注解下的参数在around方法中编写自定义逻辑。我得到下面提到的错误。我试着阅读多个来源,而且大多数来源都与使用 @annotation . 我发现同样的道理很难理解。有人能解释一下,为什么用下面的方法 @within 没有明确的例子?
注解(slf4jtrace.java):

package io.ud.project.falcon.logging;

import io.ud.project.falcon.logging.generator.AbstractLogTraceIdGenerator;
import io.ud.project.falcon.logging.generator.DefaultLogTraceIdGenerator;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Slf4jTrace {

    String traceKey() default "traceId";

    Class<? extends AbstractLogTraceIdGenerator> traceValueGenerator() default DefaultLogTraceIdGenerator.class;

}

方面组件(slf4jtraceaspect.java):

package io.ud.project.falcon.logging;

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
@SuppressWarnings("unused")
@Slf4j
public class Slf4jTraceAspect {

    @Pointcut("execution(public * *(..))")
    public void publicOperation() {
        //Using this pointcut annotation for Around method.
    }

    @Around(value = "@within(slf4jTrace) && publicOperation()")
    public void logTrace(ProceedingJoinPoint joinPoint, Slf4jTrace slf4jTrace) throws Throwable {
        //Custom logic that uses slf4jTrace's parameters        
        joinPoint.proceed();
        //Custom logic that uses slf4jTrace's parameters
    }
}

注解类(foo.java):

package io.ud.project.falcon.logging;

import io.ud.project.falcon.logging.Slf4jTrace;

@Slf4jTrace(traceKey = "auditID")
public class Foo {

    public void doSomething() {
        //Something happens here.
    }

}

应用程序启动时出错:

, 2021-01-02 22:16:41,340, ERROR [main] o.s.b.SpringApplication.reportFailure(833) | Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'objectMapperConfigurer' defined in springfox.documentation.spring.web.SpringfoxWebMvcConfiguration
: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cache.annotation.ProxyCachingConfiguration': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error Type referred to is not an annotation type: slf4jTrace
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:497)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:205)
        at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:238)
        at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:709)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:534)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234)
        at io.ud.project.falcon.FalconApplication.main(FalconServiceApplication.java:65)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
zfycwa2u

zfycwa2u1#

我没有试着运行你的代码,但我一看就立刻注意到两件事: BeanCreationException 对于内部spring类型,如果aspect切入点太宽,也就是说aspect也被编织到spring类中(即使没有在spring类中执行)。在这种情况下,您希望通过添加以下内容来限制方面范围 ... && within(my.package..*) 你的切入点。或者,如果您的方面在一个库中,该库可能针对未知的包名运行,那么您可以通过以下方式排除导致问题的spring包或类: !within(org.springframework..*) 或者任何适用于你的包裹名称。请看我的答案。
你的 @Around 通知返回 void ,即它也将只匹配 void 方法,这可能不是你想要的。为了匹配非void方法,通知必须返回 void ,通常只是 Object 如果要匹配任何返回类型。还要确保返回 proceed() 或者任何你想要返回的结果。

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