private static final String CHECK_UPPER_BOUND = "check upper bound";

    private static final String CHECK_UPPER_BOUND_INCLUSIVE = "check upper bound is inclusive";

    private static final String CHECK_LOWER_BOUND = "check lower bound";

    private static final String CHECK_LOWER_BOUND_INCLUSIVE = "check lower bound is inclusive";

                throw new UnresolvableModelException(
                        String.format(
                                "The requested parent version range '%s' does not specify an upper bound",
                                parent.getVersion()),
                        parent.getGroupId(),
                        parent.getArtifactId(),
                        parent.getVersion());
            }

        result.setVersionConstraint(versionConstraint);

        if (versionConstraint.getRange() == null) {
            result.addVersion(versionConstraint.getVersion());
        } else {
            VersionRange.Bound lowerBound = versionConstraint.getRange().getLowerBound();
            if (lowerBound != null
                    && lowerBound.equals(versionConstraint.getRange().getUpperBound())) {

                        // checksum doesn't match. This could be a problem with the server (ibiblio HTTP-200 error
                        // page), so we'll try this up to two times. On the second try, we'll handle it as a bona-fide
                        // error, based on the repository's checksum checking policy.
                        if (firstRun) {
                            logger.warn("*** CHECKSUM FAILED - " + e.getMessage() + " - RETRYING");