package com.baeldung.javaxval.notnull; import jakarta.validation.Validation; import jakarta.validation.Validator; import jakarta.validation.ValidatorFactory; import jakarta.validation.constraints.NotNull; public class NotNullMethodParameter { ValidatorFactory factory = Validation.buildDefaultValidatorFactory(); Validator validator = factory.getValidator(); public int doesNotValidateNotNull(@NotNull String myString) { return myString.length(); } public int validateNotNull(@NotNull String myString) { validator.validate(myString); return myString.length(); } }