Cross field validation with HibernateValidator displays no error messages

I'm validating two fields, "password" and "confirmPassword" on the form for equality using HibernateValidator as specified in this answer. The following is the constraint descriptor (validator interface).

package constraintdescriptor;

import constraintvalidator.FieldMatchValidator;
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.TYPE;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

@Target({TYPE, ANNOTATION_TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy = FieldMatchValidator.class)
@Documented
public @interface FieldMatch
{
    String message() default "{constraintdescriptor.fieldmatch}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};

    /**
     * @return The first field
     */
    String first();

    /**
     * @return The second field
     */
    String second();

    /**
     * Defines several <code>@FieldMatch</code> annotations on the same element
     *
     * @see FieldMatch
     */
    @Target({TYPE, ANNOTATION_TYPE})
    @Retention(RUNTIME)
    @Documented
    public @interface List{
        FieldMatch[] value();
    }
}

The following is the constraint validator (the implementing class).

package constraintvalidator;

import constraintdescriptor.FieldMatch;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import org.apache.commons.beanutils.BeanUtils;

public