A constraint mapping contributor can be configured in META-INF/validation.xml, using the property org.hibernate.validator.HibernateValidatorConfiguration#CONSTRAINT_MAPPING_CONTRIBUTORS, thus allowing to set up constraints to be validated by default validators dynamically via the API for programmatic constraint declaration.

Implementations must have a no-args constructor.

One or more mappings can be added as shown in the following:

public static class MyConstraintMappingContributor implements ConstraintMappingContributor {

    public void createConstraintMappings(ConstraintMappingBuilder builder) {
        builder.addConstraintMapping()
            .type( Marathon.class )
                .property( "name", METHOD )
                    .constraint( new NotNullDef() )
                .property( "numberOfHelpers", FIELD )
                    .constraint( new MinDef().value( 1 ) );

        builder.addConstraintMapping()
            .type( Runner.class )
                .property( "paidEntryFee", FIELD )
                    .constraint( new AssertTrueDef() );
    }
}