Solon Offers 20+ Validation Annotations Without javax or jakarta Dependencies

Solon's solon-security-validation plugin provides a lightweight validation framework for Java developers that avoids the dependency overhead of JSR 380, javax.validation, and jakarta.validation. The plugin supports over 20 built-in annotations covering common constraints such as @NotNull, @Email, @Min, @Max, and @Pattern, applicable at the method, parameter, or field level. Validation is split into two phases: context validation that runs before parameter injection and parameter validation that runs after, each backed by a distinct internal mechanism. Developers can validate nested DTOs and apply group-based validation for scenarios like create versus update operations using @Validated. The framework is also extensible, allowing custom validator annotations to be created by implementing a Validator interface and registering the class with the plugin.