Maven jar包冲突异常：java.lang.NoSuchMethodError: org.springframework.web.util.UrlPathHelper.getLookupPath

在springboot整合websocket的时候，运行项目的时候，报了一下异常：

java.lang.NoSuchMethodError: org.springframework.web.util.UrlPathHelper.getLookupPathForRequest(Ljavax/servlet/http/HttpServletRequest;Ljava/lang/String;)Ljava/lang/String;
    at org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingCondition(PatternsRequestCondition.java:220) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.RequestMappingInfo.getMatchingCondition(RequestMappingInfo.java:240) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:94) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:58) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.addMatchingMappings(AbstractHandlerMethodMapping.java:427) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:389) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:367) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:449) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:67) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:393) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1234) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1016) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:645) ~[javax.servlet-api-4.0.1.jar:4.0.1]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:750) ~[javax.servlet-api-4.0.1.jar:4.0.1]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:394) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:253) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:348) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:173) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-embed-core-9.0.27.jar:9.0.27]
 

当时，看了异常也是一头雾水，然后急急忙慌的去找度娘，百度了半天也没有很详细的说明，最后无意间看到一篇文章的只字片语，说的大概是jar冲突了，当时也不太很明白，就仔细看了控制台报的异常，然后去找自己的pom，发现真的是有jar包冲突了，

因为springboot已经做了深度的集成和优化，要注意是否添加了不需要的依赖、配置或声明。由于springboot已经有了自己的配置，再这些配置有可能导致各种各样的异常。

 

通过idea查看引入的坐标，点击springboot集成的websocket中的jar包发现已经集成了spring-web，所以导致了项目报的那个NoSuchMethodError: 异常。报这个异常，大部分应该是jar包冲突，所以今天也是学到东西了，以后再出现这种异常，自己也不用慌了。
本篇博文希望能给大家一个帮助，也是记录下自己所遇到的问题，方便以后备用。