spring-validation

What problem does it solve?

Bean Validation in Spring Boot enforces data integrity across DTOs, controllers, and services by providing reusable constraints, cross-field checks, and custom validators with internationalized messages.

Core Features & Use Cases

• Built-in constraints (NotNull, NotBlank, Size, Pattern, Email, etc.) applied to request payloads and domain models
• Custom constraint annotations and cross-field validation to enforce business rules
• Validation groups for create vs update scenarios
• Nested object and collection validation with @Valid and container element constraints
• Method-level validation for service layer methods
• Internationalization of error messages and error formatting (RFC 7807 patterns)

Quick Start

Annotate your DTO fields with the appropriate Jakarta Validation annotations to enforce rules on incoming requests.