Spring Form Validation (JSR-303)

Question

Getting an error while using validation api. Am validating the input in register.jsp i have included the required jars. validation-api-1.1.0.Final.jar hibernate-validator-5.0.1.Final.jar

register.jsp

<h4>Register</h4>
<form:form method="post" action="register" modelAttribute="user">
    <form:label path="userName">UserName</form:label>
    <form:input path="userName"/>
    <form:errors path="userName"/><br>
    <form:label path="password">Password</form:label>
    <form:password path="password"/> <br>
    <input type="submit" value="Register">
</form:form>

User.java

@Entity
@Table(name="usertable")
public class User {
    @Id
    @Column(name="username")
    @Size(min=6,max=10,message="Error Message")
    private String userName;
    @Column(name="password")
    private String password;

When i enter username less than 6,result.hasErrors() is false , but it should be true. RegisterController.java

@Controller
@RequestMapping(value="register")
public class RegisterController {
    @Autowired
    private RegisterService registerService;
    @RequestMapping(method=RequestMethod.POST)
    public ModelAndView register(@Valid User user,BindingResult result){
        System.out.println("hi");
        if(result.hasErrors()){
            return new ModelAndView("index");
        }
        else{
            if(registerService.register(user))  
                return new ModelAndView("success");
            return new ModelAndView("failure");
        }
    }
    public RegisterService getRegisterService() {
        return registerService;
    }
    public void setRegisterService(RegisterService registerService) {
        this.registerService = registerService;
    }
}

RegisterService.java

@Service
public class RegisterService {
    @Autowired
    private RegisterDao registerDao;
    @Transactional
    public boolean register(User user){
        registerDao.register(user);
        return true;
    }
    public RegisterDao getRegisterDao() {
        return registerDao;
    }
    public void setRegisterDao(RegisterDao registerDao) {
        this.registerDao = registerDao;
    }
}

RegisterDao.java

@Repository
public class RegisterDao {
    @Autowired
    private SessionFactory sessionFactory;
    public boolean register(User user){
        this.sessionFactory.getCurrentSession().save(user);
        return true;
    }
    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
}

Am getting this error

SEVERE: Servlet.service() for servlet [spring] in context with path [/Annotated] threw exception [Request processing failed; nested exception is javax.validation.ConstraintViolationException: Validation failed for classes [com.labs.domain.User] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='Error Message', propertyPath=userName, rootBeanClass=class com.labs.domain.User, messageTemplate='Error Message'}
]] with root cause
javax.validation.ConstraintViolationException: Validation failed for classes [com.labs.domain.User] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='Error Message', propertyPath=userName, rootBeanClass=class com.labs.domain.User, messageTemplate='Error Message'}
]

Can someone tell me where am going wrong ?

Answer 1

Try to add the second needed annotation to the Controller RequestMapping:

@RequestMapping(method=RequestMethod.POST)
public ModelAndView register(@Valid @ModelAttribute User user, BindingResult result) {
    ...
}

Also, is there a GET Request in which you feed the model with an appropriate User when loading the page initially, before submitting the ?

Answer 2

After reading spring validation documentation , i got to know that, i have to add <mvc:annotation-driven/> in my spring configuration.