1. 复现问题

今天调用/user/getAll接口时，报出如下错误：

com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.54, class org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint$SourceLocationImpl, fieldName : sourceLocation
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:523)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:160)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:310)
	at com.alibaba.fastjson.serializer.ASMSerializer_1_MethodInvocationProceedingJoinPoint.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:281)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:676)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:614)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:579)
	at com.superjson.superjsonmanager.aop.log.RequestLogAspect.doBefore(RequestLogAspect.java:75)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:617)
	at org.springframework.aop.aspectj.AspectJMethodBeforeAdvice.before(AspectJMethodBeforeAdvice.java:44)
	at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:57)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:89)
	at com.superjson.superjsonmanager.aop.log.RequestLogAspect.doAround(RequestLogAspect.java:95)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:624)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:72)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692)
	at com.superjson.superjsonmanager.controller.UserController$$EnhancerBySpringCGLIB$$25c82d38.getAllUsers(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
......

即com.alibaba.fastjson.JSONException: write javaBean error, ，也就是说，fastjson创建Javabean对象错误，为什么会出现这种情况呢？只能通过断点进行如下分析。

2. 分析问题

通过分析上述其他的错误信息class org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint$SourceLocationImpl, fieldName : sourceLocation可得错误发生在切面属性上。

我的切面类是RequestLogAspect，这是全局统一日志类，使用的是 spring boot aop切面技术，断点如下：

通过断点可以清晰地定位到问题在joinPoint.proceed();，而 attributes.getRequest();返回的是ShiroHttpServletRequest对象。

为什么会返回这个对象，而不是 spring boot aop的对象呢？因为我配置了shiro aop，如下代码所示：

/**
 * 开启Shiro的注解(如@RequiresRoles,@RequiresPermissions), 需借助SpringAOP扫描使用Shiro注解的类,并在必要时进行安全逻辑验证
 * 配置以下两个bean(DefaultAdvisorAutoProxyCreator(可选)和AuthorizationAttributeSourceAdvisor)即可实现此功能
 *
 * <p>creator.setUsePrefix(false); 二者择其一 creator.setProxyTargetClass(false);
 *
 * @return
 */
@Bean
@DependsOn({"lifecycleBeanPostProcessor"})
public DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator() {
  DefaultAdvisorAutoProxyCreator creator = new DefaultAdvisorAutoProxyCreator();
  creator.setUsePrefix(false);
  return creator;
}

为什么配置了 shiro aop 就会导致 spring aop 失效呢？原因在于二次代理，如下所示：

由于使用了aop:aspectj-autoproxy强制了proxy-target-class
也就是说对Web层的Class(主要是Controller)使用了CGLib代理
然后在Shiro进行代理时使用DefaultAdvisorAutoProxyCreator
原本应该判断Controller，发现没有任何接口，所以使用CGLib来代理
但是由于Controller已经被CGLib代理过一次了
DefaultAdvisorAutoProxyCreator拿到对不是Contoller本身，而是CGLib的代理结果
CGLib的代理结果本身是有接口的，干扰
DefaultAdvisorAutoProxyCreator的内部判断
使用JDK去代理CGLib的代理结果
结果Controller的函数时去了CGLib的接口中找方法名，发现方法不存在，导致代理失败

3. 解决问题

根据网上的资料说，我们需要在application.yml中进行如下配置：

# spring 配置
spring:
  aop: # 解决spring aop和shiro冲突的问题
    proxy-target-class: true

但实际这种配置无法解决问题，依然报出如上的错误。

因而，我需要修改切面类的 @Pointcut注解，使用注解的方式解决这个问题，如下代码：


// 原来的代码，即扫描控制器
//  @Pointcut("execution(public * com.superjson.superjsonmanager.controller.*.*(..))")
//  public void requestLog() {}

 /**
  * 新代码: 使用注解的方式解决shiro aop 和 spring aop之前的冲突
  * 
  * @author 念兮为美
  * @datetime 2022/8/22:11:32
  * @return 
  */
@Pointcut("@annotation(com.superjson.superjsonmanager.annotation.LogAnnotation)")
public void requestLog() {}

我的LogAnnotation注解类如下所示：

/**
 * @author 念兮为美
 * @datetime 2022/8/22 10:05
 * @desc 日志注解
 */
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface LogAnnotation {
}