public int getRecommendationsArtifactsRolloverMax() {
        int rollovermax = Integer.parseInt(getProperty(RECOMMENDATIONS_ARTIFACTS_ROLLOVER_MAX));
        return (rollovermax == 0) ? 100 : rollovermax;
    }
@return conventional Java version number, e.g. 7.
Integer is used here to simplify comparisons during usage.
If java version is not supported, returns -1
ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java