CODEWITHSUNDEEP
jsonspring-bootpostman
SKY-BIRD Web Media
SKY-BIRD Web Media

Reputation: 1

Validating Post Json Data Spring Boot

Controller

@RequestMapping(value="/create", method=RequestMethod.POST, consumes={"application/json"})
public Alien addDetails(@RequestBody Alien alien){
return repo.save(alien);
}

Alien.java

@Entity

public class Alien{
@Id
private int id;
private String name;
private String planet;
Getter and setter

Now I want to validate the post json data before saving it to the database. If any of the field is empty then the controller should return an error. For example

{"id": 1, "name": "Alien1", "planet":"Mars" }

This is acceptable json data But if there is any field is missing such as

{"name": "Alien1", "planet":"Mars" }

Then the controller should return an error and not creating the instance of Alien

I tried with @Valid @NotNull still the controller creates an empty instance of Alien and save to the database.

Upvotes: 0

Views: 1778

Answers (2)

Manir Mahamat
Manir Mahamat

Reputation: 106

First of all, you should add spring boot validation dependency into your pom.xml :

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

And then add annotations like @NotBlank or @NotEmpty to verify if a value is assigned to that field or not. Those annotations should be on the top of your entity's attributes which you want to validate them.For example:

public class Alien{
  @NotBlank(message="Name is mandatory")
  private String name;
}

Finally, add @Valid annotation into your controller method like:

public Alien addDetails(@Valid @RequestBody Alien alien){
 return repo.save(alien);
 }

Upvotes: 1

AidH
AidH

Reputation: 650

You should add @Validated annotation to your controller to make @Valid annotation do the work. You should also annotate fields in your Entity with constraints.

I.e., name could be @NotBlank.

And yes, make sure that you have imported:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

Edit: In Controller, you should not accept Entity as a body. Instead, you should create a DTO object and then map it to the Entity in the service. You should also put validation constraints on the DTO!

Upvotes: 0

Related Questions