背景：SpringBoot的项目配置了对jsp的支持，走控制器就报这个错误。相关配置如下：



	<!-- JＳＰ　ＢＥＧＩＮ -->

	<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>org.apache.tomcat.embed</groupId>

            <artifactId>tomcat-embed-jasper</artifactId>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

            </dependency>

        <!-- JＳＰ　ＥＮＤ -->


2018-05-29 09:42:00,104 [http-nio-8080-exec-4] ERROR o.a.c.c.C.[Tomcat].[localhost].[/].[jsp]:182 - Servlet.service() for servlet [jsp] threw exception

java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.views.login_jsp

	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

	at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:129)

	at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:60)

	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:159)

	at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:171)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:380)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)

	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:470)

	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)

	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)

	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:170)

	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:314)

	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1325)

	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1069)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1008)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)

	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)

	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)

	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)

	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)

	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

	at java.lang.Thread.run(Thread.java:748)

解决方法：这个错误网上都是jar包的问题，后来自己试了各种方法都不行，后来发现确实是jar包的问题，不过不是系统的jar的问题，而是子本地仓库jar包的问题，删除重新下载后问题解决

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