if (version == null) {
            throw new GradleException("There is currently no version information available for '" + placeHolder + "'.");
        }
        return version;
    }

    static boolean isPlaceHolder(String version) {
        return DefaultWrapperVersionsResources.PLACE_HOLDERS.contains(version);
    }

    GradleVersion getGradleVersion() {
        if (gradleVersion == null) {