系統開發接入shiro權限后，項目啟動，進入項目的某一個功能時報以下錯誤：（這個錯誤在業務日志里是看不到的，得去localhost.log里查看）
1 [http-nio-8301-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [AppServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: object is not an instance of declaring class 2 HandlerMethod details: 3 Controller [com.sun.proxy.$Proxy44] 4 Method [public java.lang.String com.crm.web.controller.payplat.PayPlatController.payPlatList()] 5 Resolved arguments: 6 ] with root cause 7 java.lang.IllegalArgumentException: object is not an instance of declaring class 8 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 9 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 10 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 11 at java.lang.reflect.Method.invoke(Method.java:498) 12 at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214) 13 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 14 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 15 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748) 16 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689) 17 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) 18 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) 19 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) 20 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931) 21 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822) 22 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) 23 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807) 24 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 25 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 26 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 27 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 28 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 29 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 30 at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) 31 at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) 32 at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) 33 at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) 34 at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) 35 at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) 36 at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) 37 at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) 38 at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) 39 at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) 40 at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) 41 at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) 42 at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) 43 at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) 44 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 45 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 46 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 47 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108) 48 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 49 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 50 at com.crm.web.filter.CrossDomainFilter.doFilter(CrossDomainFilter.java:38) 51 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 52 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 53 at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:67) 54 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 55 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 56 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) 57 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 58 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475) 59 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) 60 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) 61 at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651) 62 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) 63 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) 64 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:498) 65 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 66 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:796) 67 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1374) 68 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 69 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 70 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 71 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 72 at java.lang.Thread.run(Thread.java:748)
可是接入方式和配置方式和以前的一模一樣，以前系統跑的好好的，看到這個錯誤一臉懵逼。
於是找度娘幫忙，可搜出來的都只是說反射出錯了，沒有實際可用的解決方案。
還是得靠自己，開始一句一句跟代碼。發現在用到操作權限的地方沒有調用shiro的doGetAuthorizationInfo方法，
這很不正常啊，然后度娘了一下。找到如下方案：
1、在shiro.xml配置文件里添加這個配置
<aop:config proxy-target-class="true"></aop:config>
經過實踐，此方法不管用
2、在shiro.xml配置文件里的這個bean下定義proxyTargetClass此屬性的值
<!-- AOP式方法級權限檢查 --> <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator" depends-on="lifecycleBeanPostProcessor">
<!--指定使用動態代理機制true表示使用CGLib代理-->
<property name="proxyTargetClass" value="true"/>
</bean>
啟動項目，發現居然不報錯了，一切正常了。
費了大半天功夫，終於不報錯，項目正常了，非常欣喜。可是對於為什么添加這個屬性就不報錯了還是一臉懵逼。於是
搜了一下這個屬性。說是AOP式方法級權限檢查，突然想到點什么：這個項目和其他項目不同的是在這個項目里添加了一個記錄系統日志的aop，這個aop的切點是@annotation(org.springframework.web.bind.annotation.RequestMapping)，
報錯的那個方法既有這個注解也有shiro操作權限的@RequiresPermissions注解。通過實踐也證明了我的猜想。
RequestMapping不是一個實現類，所以需要用CGLIB動態代理。
如果要被代理的對象是個實現類，那么Spring會使用JDK動態代理來完成操作（Spirng默認采用JDK動態代理實現機制）
如果要被代理的對象不是個實現類，那么，Spring需要使用CGLib來實現動態代理。