javax big int validation in spring boot

To validate a BigInteger value in a Spring Boot application, you can follow these steps:

  1. Add the necessary dependencies: In your pom.xml or build.gradle file, include the required dependencies for Spring Boot and the validation framework. For example, if you're using Maven, you can add the following dependencies:
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>
  1. Create a DTO (Data Transfer Object): Define a DTO class that represents the data structure you want to validate. Include a field of type BigInteger that needs to be validated. For example:
public class MyDto {
    @NotNull
    @Positive
    private BigInteger myNumber;

    // getters and setters
}

  1. Add validation annotations: Use the validation annotations provided by the javax.validation.constraints package to define the validation rules for the BigInteger field. In this example, we're using @NotNull to ensure the field is not null and @Positive to ensure the value is positive.

  2. Implement the validation logic: In your controller or service class, inject the javax.validation.Validator class, which is responsible for performing the validation. For example:

@RestController
public class MyController {
    private final Validator validator;

    public MyController(Validator validator) {
        this.validator = validator;
    }

    @PostMapping("/validate")
    public ResponseEntity<?> validateDto(@Valid @RequestBody MyDto dto) {
        Set<ConstraintViolation<MyDto>> violations = validator.validate(dto);
        if (!violations.isEmpty()) {
            // handle validation errors
            return ResponseEntity.badRequest().body("Validation failed");
        }

        // continue with the logic
        return ResponseEntity.ok("Validation passed");
    }
}
  1. Perform validation: In the controller method, annotate the DTO parameter with @Valid to trigger the validation process. After validation, you can check if there are any constraint violations using the Validator.validate() method. If there are violations, you can handle them accordingly.

That's it! By following these steps, you can validate a BigInteger value in a Spring Boot application using the validation framework. Remember to handle validation errors appropriately and provide meaningful responses to the client.