javax.servlet.ServletException: java.lang.NoClassDefFoundError

今天初学springMVC，通过model 传递参数时出了一个错误：

controller层代码如下：

    @RequestMapping(path = "/helloworld")
    public String  hello(Model model) {

        Map map=new HashMap<>();
        map.put("1","玫瑰--<-<-<@ --<-<-<@");
        map.put("2","茉莉花Molise");
        map.put("3","海棠Haiti");
        model.addAttribute("map",map);
        return  "hello";
    }

view层代码如下：

${key.value}
    

错误如下：

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTag
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1246)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1029)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:973)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
	org.springframework.web.servlet.frameworkServlet.processRequest(frameworkServlet.java:967)
	org.springframework.web.servlet.frameworkServlet.doGet(frameworkServlet.java:858)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	org.springframework.web.servlet.frameworkServlet.service(frameworkServlet.java:843)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

检查原因是：未有导包jar