Spring：客户端发送的请求在语法上是不正确的（）

Question

Hi I received next error during the redirect:

The request sent by the client was syntactically incorrect

URL which browser shows is: localhost:8080/Project/menu/main/home/0 and here my classes with redirects first - "from", second "to":

 /*
 * Get all possible values of menu and generate correct url to pages controllers
 * 
 */

@Controller
@SessionAttributes("menu")
public class MainMenuController {


    @ModelAttribute
    public Menu createMenu() {
        return new Menu();
    }

    @RequestMapping(value = "/menu", method = RequestMethod.GET)
    public String mainMenuResolver(@ModelAttribute Menu menu) {
        menu.setMainMenu("first");
        return "forward:/menu/first";
    }

    @RequestMapping(value = "/menu/{mainMenu}", method = RequestMethod.GET)
    public String subMenuResolver(@PathVariable String mainMenu, @ModelAttribute Menu menu) {
        menu.setMainMenu(mainMenu);
        menu.setSubMenu("home");
        return "forward:/menu/first/home";
    }

    @RequestMapping(value = "/menu/{mainMenu}/{subMenu}", method = RequestMethod.GET)
    public String secMenuResolver(@PathVariable String mainMenu, @PathVariable String subMenu, @ModelAttribute Menu menu) {
        menu.setMainMenu(mainMenu);
        menu.setSubMenu(subMenu);
        menu.setSecMenu("0");

        if (menu.getMainMenu().equals("first")){
            return "redirect:/menu/main/"+menu.getSubMenu()+"/"+menu.getSecMenu();
        }

        if (menu.getMainMenu().equals("second")){
            return "redirect:/menu/religion/"+menu.getSubMenu()+"/"+menu.getSecMenu();
        }

        return "redirect:/menu/main/"+menu.getSubMenu()+"/"+menu.getSecMenu();
    }
}

Second class:

@Controller
@SessionAttributes("menu")
public class FirstPageController {

    @ModelAttribute
    public Menu createMenu() {
        return new Menu();
    }

    @RequestMapping(value = "/menu/main/{subMenu}/{secMenu}", method = RequestMethod.GET)
    public ModelAndView menuResolver(@PathVariable String mainMenu, @PathVariable String subMenu,@PathVariable String secMenu, @ModelAttribute("menu") Menu menu) {
        menu.setMainMenu(mainMenu);
        menu.setSubMenu(subMenu);
        menu.setSecMenu(secMenu);       

        if (menu.getSubMenu().equals("home")){
            String title = "Project - Home Page";
            return new ModelAndView("MainPage", "title", title);
        }

        String title = "Project - Home Page";
        return new ModelAndView("MainPage", "title", title);
    }
}

Solved : I solved it, there excess parameter in the method of the second class.

Answer 1

In cases like this it is very useful to have org.springframework.web loggin level set to DEBUG in log4j configuration

<logger name="org.springframework.web">
    <level value="DEBUG" />
    ...
</logger>

Eg when parameter is missing or cannot be converted to the required type there will be an exception details in the log.

Answer 2

在我的情况下，这个错误的原因是浏览器（Chrome，在我的特定情况下）是以错误的格式将date从<input type="date" ... />发送到服务器，因此服务器不知道如何解析它。

Answer 3

As said ike3 , using the detailed log aided a lot to find the solution for me. In my case it was a mismatch between @PathVariable without name specified, and the variable itself.

Something like this:

@RequestMapping("/user/{uname}")
public String doSomething(@PathVariable String username) { ...

Note the difference between "uname" and "username" ! There was an exception internally that wasn't raised and I couldn't see it until I set the log to INFO level.

Answer 4

In my case, it was also a problem of conversion, Spring was expecting an Integer however I was entering a String. Try to check what you have passed as parameters to the controller