Regarding Spring Bean Validation for Value Verification
You are likely familiar with validation messages on sign-up screens, such as "Invalid email format" or "Password must be at least 8 characters long." If you manually write this validation logic using if statements in every controller, the same code is repeated in multiple places and quickly becomes mixed with business logic, ruining readability. In this video, we cover Bean Validation (Jakarta Bean Validation 3.0), a Java standard specification that automates validation with just one or two lines of annotations.
First, we organize standard annotations by category, such as @Size, @Min, @Max, @Email, and @Pattern, as well as the subtle differences between @NotNull, @NotEmpty, and @NotBlank. Next, we examine the flow where validation is automatically performed before entering a method when @Valid is attached to a controller, and the standard pattern of unifying response formats by catching MethodArgumentNotValidException with @RestControllerAdvice.
In the latter part, we cover group validation to validate the same DTO differently during creation and modification, validating method parameters based on AOP by attaching @Validated to service classes, creating domain-specific custom annotations using @Constraint and ConstraintValidator, and the pitfall of omitting @Valid when validating nested objects, which results in the inner parts not being validated. Finally, we conclude by clearly distinguishing the usage of @Valid and @Validated, and explaining why format validation and domain rules (balance, duplicate email, etc.) must be separated.
📌 Recommended for:
✅ Backend developers struggling with accumulated if statement validation code in controllers
✅ Those who want to clearly understand the difference between @Valid and @Validated
✅ Those who need group validation because the same DTO needs to be validated differently during creation and modification
✅ Junior developers who want to try creating domain-specific validation annotations themselves
#BeanValidation #SpringValidation #Valid #Validated #SpringBoot
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