部署springMVC报错解决

最近学习springMVC部署，按照教程建议一个项目，去发现报错，如下：

HTTP Status 500 - Unable to compile class for JSP:

type Exception report

message Unable to compile class for JSP:

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: [63] in the generated java file: [/Users/wenboliu/Library/Caches/IntelliJIdea14/tomcat/Tomcat_8_0_20_spingMVC/work/Catalina/localhost/ROOT/org/apache/jsp/WEB_002dINF/pages/hello_jsp.java]
The method getDispatcherType() is undefined for the type HttpServletRequest

Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:198)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:450)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:361)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:570)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.20 logs.

 最终排查发现，原来在于项目所依赖的jar包出现问题，jsp-api.jar与servlet-api.jar两个jar包出现了两次，所以删掉之后问题就解决了。。。