报错信息

java.lang.ClassCastException: org.springframework.web.servlet.handler.AbstractHandlerMapping$PreFlightHandler cannot be cast to org.springframework.web.method.HandlerMethodat com.merc.gmall.interceptors.AuthInterceptor.preHandle(AuthInterceptor.java:23) ~[classes/:na]at org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.java:133) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:962) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.servlet.FrameworkServlet.doOptions(FrameworkServlet.java:908) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at javax.servlet.http.HttpServlet.service(HttpServlet.java:670) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.14.RELEASE.jar:4.3.14.RELEASE]at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.27.jar:8.5.27]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.27.jar:8.5.27]at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.27.jar:8.5.27]at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

分析

从报错信息可知，问题出现在AuthInterceptor的第23行。这里的代码是这样的

@Component
public class AuthInterceptor extends HandlerInterceptorAdapter {public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 拦截代码// 判断被拦截的请求的访问的方法的注解(是否时需要拦截的)HandlerMethod hm = (HandlerMethod) handler;//省略...
}

在第23行，代码中做了一个强制类型转换。根据异常信息，在这里得到的handler是一个PreFlightHandler，而不是HandlerMethod。所以会报错。
这里的PreFlightHandler和HandlerMethod分别是什么呢？
AbstractHandlerMapping.PreFlightHandler【官方文档】

问题解决

只需要在这句话前加入一个判断就好

if (!(handler instanceof HandlerMethod)) {return false;
}
HandlerMethod handlerMethod = (HandlerMethod) handler;

参考
https://blog.51cto.com/winters1224/2049425
https://www.cnblogs.com/nihilwater/p/13456191.html

AbstractHandlerMapping$PreFlightHandler can‘t be cast to springframework.web.method.HandlerMethod相关推荐

cannot be cast to org.springframework.web.method.HandlerMethod 统一异常处理发生异常。
加入这个: <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandl ...
org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert val
org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert val ...
报错，null [org.springframework.web.method.annotation.MethodArgumentTypeMismatchException,Failed to con
问题: { "success": false, "code": "S0000", "error" ...
Resolved [org.springframework.web.method.annotation.MethodArgumentTypeMismatchException
废话不多说上报错 Resolved [org.springframework.web.method.annotation. MethodArgumentTypeMismatchException: ...
org.springframework.web.servlet.resource.ResourceHttpRequestHandler cannot be cast to org.springfra
org.springframework.web.servlet.resource.ResourceHttpRequestHandler cannot be cast to org.springfram ...
StandardMultipartHttpServletRequest$StandardMultipartFile cannot be cast to org.springframework.web
错误: java.lang.ClassCastException: org.springframework.web.multipart.support.StandardMultipartHttpSer ...
Java之——java.lang.NoSuchMethodException: [org.springframework.web.multipart.MultipartFile;.()
转自:https://blog.csdn.net/l1028386804/article/details/65449355 ava.lang.NoSuchMethodException: [org.s ...
org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.logException Resolved
场景: spring项目中无法访问到对应controller,查看日志,没有报错,只有warnring: org.springframework.web.servlet.handler.Abstrac ...
org.springframework.web.multipart.MultipartException: Current request is not a multipart request
在做项目时,后端采用上传文件组件MultipartFile时,使用swagger测试文件上传出现了以下问题: 2022-03-24 22:02:07 |ERROR |http-nio-9000-exe ...

AbstractHandlerMapping$PreFlightHandler can‘t be cast to springframework.web.method.HandlerMethod

目录

报错信息

分析

问题解决

AbstractHandlerMapping$PreFlightHandler can‘t be cast to springframework.web.method.HandlerMethod相关推荐

最新文章

热门文章