Bean Validation sample #lab

Foo.java

package io.github.benas.labs.javaee.beanvalidation;

import javax.validation.constraints.NotNull;

public class Foo {

    @NotNull(message = "{name.error}")
    private String name;

    public Foo() {
    }

}

Main.java

package io.github.benas.labs.javaee.beanvalidation;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.Set;

public class Main {

    public static void main(String[] args) {

        Foo foo = new Foo();

        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();
        Set<ConstraintViolation<Foo>> constraintViolations = validator.validate(foo);
        if (constraintViolations.size() > 0) {
            for (ConstraintViolation<Foo> constraintViolation : constraintViolations) {
                System.out.println(constraintViolation.getMessage());
            }
        } else {
            System.out.println("Foo instance is ok");
        }
    }
}

ValidationMessages.properties

name.error=name is required