I'm new to spring & hibernate, please suggest a best way to provide validation to spring mvc & hibernate projects. I tried hibernate validator but i don't know how to use it when there is relationship(like #OneToOne) between entity objects. If there is any examples, please provide the link.
Your #OneToOne relationship is not clear enough. Could you please give a concrete scenario?
In Spring MVC you have three types of validations:
JSR-303 bean validation (hibernate validator)
Custom validation
Spring validation
JSR-303 works great for simple validations on single fields. You have standard annotations like (#Max, #Min, #NULL, #Pattern, etc.). It does not seem enough for you in this case.
Custom validation is used in a more complex scenario. For instance, what if we need to validate that the newly added product ID is not the same as any of the existing product IDs?
Spring validation represents cross-field validation.
For instance, it's used when we want to compare two or more fields to see if
their values can be considered as valid when combined.
you can use spring validation method.
using valid annotion in controller classes infront of modelattribute annotaion.
then you can use validaions in the model class.
below is an example for controller and bean classes.
this is a many to one configuration inside a bean class:
#ManyToOne(targetEntity = UserType.class)
#JoinColumn(name = "user_type", referencedColumnName = "id")
#NotNull
private UserType userTypeTb;
this is a method inside controller class with valid and modelattribute annotaion:
public ModelAndView home(#Valid #ModelAttribute("user") User user, BindingResult result,
HttpServletRequest request) {
//
//
}
Related
I am trying to use Spring Boot Validation/ Hibernate Validator in one of our services and for the purpose of that service I created a DTO where I set customized constraints to the DTO root and on its fields.
The DTO looks like this:
#JobIsInUserQueue
#CanPerformTask
class PerformableJob(
#HasCurrentTaskList
val job: Job,
val user: Person
)
Given I have defined those annotations, and the implementation classes following the Jakarta validation framework API,
When I create an instance and let the spring boot provided validator bean process that bean:
val testable = PerformableJob(job, person)
val violations = validator.validate(testable)
Then the expected behaviour is that the three validators #JobIsInUserQueue, #CanPerformQCTask and #HasCurrentTaskList are checked,
But the actual behaviour is that only the class level annotations #JobIsInUserQueue and #CanPerformQCTask are checked.
I tried already to add #Valid to the field, but there are no nested validations within Job, so that would not be the right solution.
All custom constrains are marked with #Retention(AnnotationRetention.RUNTIME).
What do I miss here?
In following blog entry.
https://www.baeldung.com/spring-boot-bean-validation
The author mentioned about how Spring Boot works with #Valid annotation.
#RestController
public class UserController {
#PostMapping("/users")
ResponseEntity<String> addUser(#Valid #RequestBody User user) {
// persisting the user
return ResponseEntity.ok("User is valid");
}
// standard constructors / other methods
}
When Spring Boot finds an argument annotated with #Valid, it automatically bootstraps the default JSR 380 implementation — Hibernate Validator — and validates the argument.
Is it true that #Valid works as expected on #RestController without #Validated?
Then what kind of stereo types required to be explicitly annotated with #Validated?
Yes #Valid will work without #Validated in #RestController.
In Spring, we use JSR-303's #Valid annotation for method level
validation. Moreover, we also use it to mark a member attribute for
validation. However, this annotation doesn't support group validation.
Groups help to limit the constraints applied during validation. One
particular use case is UI wizards. Here, in the first step, we may
have a certain sub-group of fields. In the subsequent step, there may
be another group belonging to the same bean. Hence we need to apply
constraints on these limited fields in each step, but #Valid doesn't
support this. In this case, for group-level, we have to use Spring's
#Validated, which is a variant of this JSR-303's #Valid. This is used
at the method-level. And for marking member attributes, we continue to
use the #Valid annotation.
You can read more about this in this link.
I'm really struggling to combine #Valid with #RequestHeader.
Might this be not supported or is there a way to enable it? I couldn't find useful information about that...
When I annotate the whole controller with #Validated it works, so it is not a big issue. However, I feel like it should work with #Valid as well, so I wanted to know if I'm missing something here.
Code example:
#GetMapping("/validationControllerHeader")
public String validationControllerHeader(#Valid #RequestHeader #Pattern(regexp = "[a-z]{3}[0-9]+") String someheader) {
return someheader;
}
I'm using #Valid in the same test controller for query parameters and body validation too and there it works, so the issue is only present with headers.
Using spring boot 2.3.1.RELEASE
You are definitely supposed to use #Validated in your controller class, as it indicates that the validation is meant to be performed in that class. From the documentation:
To be eligible for Spring-driven method validation, all target classes need to be annotated with Spring’s #Validated annotation, which can optionally also declare the validation groups to use.
And, as you are using #Pattern (which is a Bean Validation annotation), you don't need #Valid.
What are the advantages of using #ModelAttribute and #Valid?
Which are the differences?
Is it possible to use them together?
#ModelAttribute is used to map/bind a a method parameter or method return type to a named model attribute. See #ModelAttributes JavaDoc. This is a Spring annotation.
#Valid is an annotation that marks an object for JSR-303 bean validation. See #Valids JavaDoc. It is part of JavaEE 6, but I think Hibernate has an earlier implementation that most people use instead.
The advantage of using #ModelAttribute is that you can map a form's inputs to a bean. The advantage of #Valid is that you can utilize JSR-303 bean validation to ensure that the bean that is made is validated against some set of rules.
Yes you can use #ModelAttribute and #Valid together.
The best way to transfer data from a form (sic View) to the a Model object is to follow the typical/traditional MVC design pattern using Spring. My personal preferred way is to have a form in a JSP with Spring JSTL <form:*> tags, with a modelAttribute set. On the Controller, have a handler to accept the POST from the form that has a matching #ModelAttribute that is a bean that represents the form's input. I would then pass that "Form Bean" to a service layer to do some things, including translating the "Form Bean" into any models if needed (not necessary if the form is creating your model objects directly) and saving/updating/etc via a DAO. This is but one way to do things, but it's probably the bulk of what I do with Spring in my day-to-day job.
I would highly recommend reading the Spring reference materials and following the tutorials. The reference materials are very well written, easy to follow, and includes lots of examples on the various ways you can do things in Spring, and there are usually quite a few options on how you do things in Spring.
please check the below part fro spring reference documentation:
In addition to data binding you can also invoke validation using your own custom validator passing the same BindingResult that was used to record data binding errors. That allows for data binding and validation errors to be accumulated in one place and subsequently reported back to the user:
#RequestMapping(value="/owners/{ownerId}/pets/{petId}/edit", method = RequestMethod.POST)
public String processSubmit(#ModelAttribute("pet") Pet pet, BindingResult result) {
new PetValidator().validate(pet, result);
if (result.hasErrors()) {
return "petForm";
}
// ...
}
Or you can have validation invoked automatically by adding the JSR-303 #Valid annotation:
#RequestMapping(value="/owners/{ownerId}/pets/{petId}/edit", method = RequestMethod.POST)
public String processSubmit(#Valid #ModelAttribute("pet") Pet pet, BindingResult result) {
if (result.hasErrors()) {
return "petForm";
}
// ...
}
I use Spring Roo + jpa + hibernate and I would like to implement cross-validation (validation of several fields at the same time) in my application.
I am not sure how to go about implementing it. Can anyone please advise me and/or direct me to relevant documentation?
Have a look at Hibernate Validator, which allows entity validation (using annotations).
http://www.hibernate.org/subprojects/validator.html
In short, you annotate your field constraints by placing hibernate validator/ JPA annotations above them. (E.g. #Min(10)) and use the following piece of code to find any invalid fields;
ValidatorFactory factory = Validation.byDefaultProvider().configure().traversableResolver(new CustomTraversableResolver() ).buildValidatorFactory();
Validator validator = factory.getValidator();
Set<ConstraintViolation<BaseValidationObject>> constraintViolations = Validator.validate(myEntityToValidate);
If you need to validate specific relationships between entities, you can write custom validators to fit that need.