JSP pages take less than the value stored inside ModelAndView ~ ~

  JAVAJSP ModelAndView   java   ModelAndView   jsp   spring mvc

Controller code :

  	@RequestMapping(value="selectDepts2.do")
  	public ModelAndView findDepts2() {
  		 List<Dept> depts=deptService.getDpets();
  		 ModelAndView mav=new ModelAndView("dept");
  		 mav.addObject("depts", depts.get(0));
  		 return mav;
  	}
  

jsp page is directly through the $ {depts}

are not being given the whole process , but the page displayed is "$ {depts}" string . .
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first your "depts" on the property controller in a domain object (requt.setattribute ("depts", depts)), then the expression obtained through EL
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spring of MVC is Servlet package , ModelAndView in addObject method should be on request.setAttribute package, so if you want to in the jsp el expression to read the data , you should use $ {requestScope.depts} , corresponding to <% = request.getAttribute ("depts")%>
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you first learn to understand how to use JSTL tags or how to get away with EL expressions .
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This method can be , but is not directly make modelAndView object into the herd right ..?
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although I do not know why, but the code is replaced by the following can be taken up. . .

  	@RequestMapping(value="selectDepts2.do")
  	public ModelAndView findDepts2() {
  		 List<Dept> depts=deptService.getDpets();
  		 Map model=new HashMap();
  		 model.put("depts", depts);
  		 ModelAndView mav=new ModelAndView("dept",model);
  		 return mav;
  	}
  

introduce errors ModelAndView class may not get value. .
correct class : import org.springframework.web.servlet.ModelAndView;
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how mathematics to understand .. ? previously studied the use of servlet and jstl . Also know the value range of different scope is the first time .. but ModelAndView use
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tried to use $ {requestScope.depts}, web display or "$ {requestScope.depts}" This string ...
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your landlord You can try adding the jsp page <% @ page isELIgnored = "false"%> to see