package org.example.validation; import static java.lang.annotation.ElementType.METHOD; import static java.lang.annotation.RetentionPolicy.RUNTIME; import java.lang.annotation.Retention; import java.lang.annotation.Target; import javax.validation.Constraint; import javax.validation.Payload; @Constraint(validatedBy = LettersOrDigitsValidator.class) @Target({ METHOD }) @Retention(RUNTIME) public @interface LettersOrDigits { String extraChars() default " .-'/"; public static final String MESSAGE = "{@validation.lettersOrDigits}"; String message() default MESSAGE; Class[] groups() default {}; Class[] payload() default {}; }