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ajax 请求后台数据返回异常 及 提示404方法名不存在
1、正常使用 Ajax 调取后台数据时，提示方法名不存在，Ajax前端正常，方法类bean注入正常，方法注解正常。但参数解析时出现异常。
@RequestMapping(value="http://www.mamicode.com/getProject")
@ResponseBody
public Map<String,Object> getProject(@RequestBody Map<String, Object> paraMap,HttpServletRequest request){
Map<String, Object> map = new HashMap<String, Object>();
String projectName = (String)paraMap.get("projectName");
强转时出现了异常，未被捕获。具体为什么这个异常会影响request解析暂时还不晓得，有哪位大神知道的请留言解释一下，谢谢。
2、方法正常流转之后无法将数据直接返回页面。提示异常如下：
十月 19, 2016 2:36:47 下午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet spring-mvc threw exception javax.servlet.ServletException: File "/jsp/error.jsp" not found at org.apache.jasper.servlet.JspServlet.handleMissingResource(JspServlet.java:335) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:229) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827) at javax.servlet.http.HttpServlet.service(HttpServlet.java:643) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.zhaopin.common.filter.SessionFilter.doFilter(SessionFilter.java:111) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:745)
网上搜查相关资料说是重复提交了数据。检查前端发现，绑定点击事件的按钮前多加了个<a href=""> 。这个href=http://www.mamicode.com/“” 影响了response跳转导致。
郁闷笔记下这些“事故”故事，缅怀（调试之痛苦）谨记（简单BUG浪费时间）之……………………
ajax 请求后台数据返回异常 及 提示404方法名不存在
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