Hi I'm just starting JEE6 with Glassfish and JSF, and I'm trying to create my first JSR-303 validation. The problem I've got is that despite the fact that everything compiles, the validator class is never called. I've listed the code below. (I know that the validator doesn't make logical sense at the moment, there's more to go in it, I'm just trying to get it to work at the moment.) Can anyone see what I'm doing wrong. Regards The annotation; package com.vasilikon.pembridge.validators; import com.vasilikon.pembridge.entities.TelephoneType; import static java.lang.annotation.ElementType.*; import static java.lang.annotation.RetentionPolicy.*; import java.lang.annotation.Documented; import java.lang.annotation.Retention; import java.lang.annotation.Target; import javax.validation.Constraint; import javax.validation.Payload; @Target({FIELD}) @Retention(RUNTIME) @Constraint(validatedBy = PhoneNumberValidator.class) @Documented public @interface PhoneNumberCheck { String message() default "Invalid Telephone number."; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; TelephoneType value(); } The validator; package com.vasilikon.pembridge.validators; import com.vasilikon.pembridge.entities.TelephoneType; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; public class PhoneNumberValidator implements ConstraintValidator<PhoneNumberCheck, Object> { private TelephoneType type; @Override public void initialize(PhoneNumberCheck constraintAnnotation) { this.type = constraintAnnotation.value(); } @Override public boolean isValid(Object value, ConstraintValidatorContext context) { try { System.out.println("isValid called"); // Never gets here long telephoneNumber = ((Long) value).longValue(); if (type == TelephoneType.MOBILE) { return isValidMobileNumber(context,telephoneNumber,type); } else { return isValidLandLineNumber(context,telephoneNumber,type); } } catch (Exception e) { /* Do Nothing */ } return true; } private boolean isValidMobileNumber(ConstraintValidatorContext context, long telephoneNumber, TelephoneType type) { /* * Mobile number is exactly 8 digits long * and starts 99nnnnnn */ boolean valid = ((telephoneNumber > 99000000) && (telephoneNumber < 999999999)); if (!valid) { context.disableDefaultConstraintViolation(); context.buildConstraintViolationWithTemplate("A mobile number must be 8 digits starting with 99") .addNode(String.valueOf(telephoneNumber)) .addConstraintViolation(); } return valid; } private boolean isValidLandLineNumber(ConstraintValidatorContext context, long telephoneNumber, TelephoneType type) { throw new UnsupportedOperationException("Not yet implemented"); } } and my backing bean (trimmed); @Named @RequestScoped public class PhoneNumberPromptBean { @Inject PembridgeServices services; @NotNull(message="You must select a number type") private TelephoneType type; @PhoneNumberCheck(TelephoneType.MOBILE) private long telephoneNumber; <Getters and Setters>