Teki is schema validation for Java DTOs.

// DTO mapped from JSON request datarecord SignupRequest(    @Required @Email @Trim String email,    @Required @Min(8) String password,    @Min(13) int age) {}// Chain rules fluently, then validate the DTOTeki signup = Teki.fromRules(    string(SignupRequest::email).required().email().trim(),    string(SignupRequest::password).required().min(8),    number(SignupRequest::age).min(13));// Or scan annotations from a Java classTeki schema = Teki.from(SignupRequest.class);var request = new SignupRequest("ada@example.dev", "super_secret", 21);var result = schema.check(request);if (!result.isValid()) {    result.errors().forEach(System.out::println);}