Why @vaild annotation is not working in my spring MVC application? I searched a lot, but couldn't find solution

Basically it should return a message if the field is not valid. but in my case it's not working here!!

below is my controller class.

@Controller 
public class StoreController {


    private NearByStoreInterface getmestore;

    @Inject
    public StoreController(NearByStoreInterface getmestore) {
        this.getmestore=getmestore;
    }


    @RequestMapping(value = "/nearbystore", method = RequestMethod.GET) 
    public String display(Model m) 
    {
        final ControllerTolibModel userDetails=ControllerTolibModel.builder().build();

        m.addAttribute("user", userDetails);

        return "formTosubmit";
    }



    @RequestMapping(value="/nearbystore", method=RequestMethod.POST)
    public String submit(@Valid @ModelAttribute("user") ControllerTolibModel userDetails,BindingResult errors,Model m) 
    {
        if(errors.hasErrors())
            return "formTosubmit";

        final List<StoresDetails> storedetails=getmestore.getmeStore(userDetails);

        if(storedetails.size()==0)
            return "nostores";

        m.addAttribute("details", storedetails);

        return "viewStoreDetails";
    }
}

here @valid is not working. also below it's modelClass of controllerTolibModel .

package com.amazon.lib;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class ControllerTolibModel {

    @NotBlank
    private String pincode;


    @NotNull
    @Min(1)
    @Max(100)
    private Double radius;


    @NotNull
    private String category;
}

Here it's a formTosubmit.jsp file. if it can help you understand more.

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<h2> Enter details here...</h2>
<body>
<form:form action="nearbystore" method="post" modelAttribute="user">
Enter your pincode : <form:input path="pincode"/><br><br>

<form:errors path="pincode"  cssClass="text-danger"/>
Enter radius in KM : <form:input path="radius"/><br><br>
Select category of store : <form:select path="category">
<form:option value="all" label="all"/>
<form:option value="grocery" label="grocery"/>
<form:option value="garments" label="garments"/>
<form:option value="electronics" label="electronics"/>
<form:option value="Dairy" label="Dairy"/>
<form:option value="QSR" label="QSR"/>
</form:select><br><br>
<input type="submit" name="submit"/>
</form:form>
</form>
</body>
</html>

Thanks in advance !

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