HELP - weird thing happening with spring mvc

[kramnivla]

Need help, this made my head spin. Look at the code

This does not work

@Controller
public class EmployeeProfileController {

    @RequestMapping("/expenses_employee")
    public Object index(HttpSession session) {
        ModelAndView mv = new ModelAndView("home");
        
        return mv;
    }
}

However, this does

@Controller
public class EmployeeProfileController {

    @RequestMapping("/expenses_employee")
    public Object index(HttpSession session) {
        
        return "home";
    }
}

I used this as resolver

<bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
        <property name="order" value="1" />
    </bean>

The weird thing is that 2 of my controllers having EXACTLY the same code, works for both cases.
The problem is that I need to pass variables to the View from the Controller.

Note that this is only a sample code, if the code logic did not make sense just ignore it. I just want to know why it does not work.

I am becoming desperate here
Please I need help.
Thank you for any help you can provide.

[dkarr]

Change your return types to match more closely what you're returning. Change "Object" to "ModelAndView", and it should work better.

[kblair]

Perhaps when the return type is Object they default to using toString(). The toString() for a ModelAndView does not return the view name.

If you specified the return type, which you should, then it works fine.

[kramnivla]

That was what I tried before I changed it to object.

It does not care what viewname I use, it still uses the request mapping.
Like in the code below, instead of going to home.jsp, it goes to expenses_employee.jsp and drops all objects I included in the ModelAndView

@RequestMapping("/expenses_employee")
    public ModelAndView index(HttpSession session) {
        ModelAndView mv = new ModelAndView("home");
        mv.addObject("pageIndex", Constants.EXPENSES_PAGE_INDEX);
        return mv;
    }

[p792]

Do this and see if this works for you

@Controller
@RequestMapping("/expenses_employee")
public class EmployeeProfileController {

     @RequestMapping(method=RequestMethod.GET)
    public String index(HttpSession session, ModelMap mv) {
        mv.addObject("pageIndex", Constants.EXPENSES_PAGE_INDEX);
        return <put yr url where you want it goes>
    }
}

[dkarr]

What is the point of the HttpSession parameter? Could you please try removing that?

[kramnivla]

WOW it works now. Thanks everyone for your help! This is the simplified code that still works employing the same code

@Controller
public class EmployeePayrollController {

    @RequestMapping("expenses_payroll")
    public String index(HttpSession session, ModelMap mv) {
        mv.addAttribute("pageIndex", Constants.EXPENSES_PAGE_INDEX);
        return "expenses_payroll";
    }
}

By the way, why did the old code not work? I would like to understand so that I could better comprehend Spring... By appearance, it should have worked, to me at least, and it did work on some controllers

Thanks everyone for your help!