Validaton(Checking Blank space)

Hi i am using java springs .I am having problem in doing validation.
I am just checking blank space.

This is my controller. I named it salescontroller.

package controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.beans.factory.annotation.Autowired;
import validator.DepartmentValidator;
import com.Department;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import manager.DeptDaoImp;
import manager.DeptDao;
import java.io.IOException;

@Controller
public class salescontroller {
private DepartmentValidator departmentValidator;
public salescontroller(DepartmentValidator departmentValidator) {
this.departmentValidator=this.departmentValidator;
}
@RequestMapping("/Department.htm")
public String showDepartment(ModelMap model){
model.addAttribute("Department",new Department());
return "Department";
}
@RequestMapping("/Departmentdo.htm")
public String onSubmit(@ModelAttribute("Department")Department d, BindingResult result, HttpServletResponse response)
throws ServletException, IOException {
departmentValidator.validate(d,result);
if(result.hasErrors())
{
return "Department";
}
return "Department";

}
}
And this is my Validator I named it DepartmentValidator
public class DepartmentValidator implements Validator {
public boolean supports(Class clazz) {
return Department.class.isAssignableFrom(clazz);
}

public void validate(Object target, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "",
"department_ID.required");
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "department_name",
"department_name.required");
ValidationUtils.rejectIfEmpty(errors, "description", "description.required");
}
}


This is my Dispatcher-servlet

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean name="/Department.htm" class="controller.salescontroller"/>
</beans>