Reloadble Properties using Apache Commons Configuration

import java.io.File;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;
import org.apache.log4j.Logger;
public class ConfigUtil {
    private static Logger log = Logger.getLogger(ConfigUtil.class);
    private static PropertiesConfiguration configuration = null;
    private static final String PROPERTY_FILENAME = "config.properties";
    private static String RELOADBLE_PROPERTY_FILENAME = null;
    private static PropertiesConfiguration reloadConfiguration = null;
    static
    {
        try {
            configuration = new PropertiesConfiguration(PROPERTY_FILENAME);
            log.info("Loading property file from classpath :");
            RELOADBLE_PROPERTY_FILENAME = ConfigUtil.getProperty("RELOAD_PROERTY_FILENAME");
             if(null != RELOADBLE_PROPERTY_FILENAME){
                File f = new File(RELOADBLE_PROPERTY_FILENAME);
                if(f.exists()){
                    reloadConfiguration = new PropertiesConfiguration(RELOADBLE_PROPERTY_FILENAME);
                    reloadConfiguration.setReloadingStrategy(new FileChangedReloadingStrategy());
                    log.info("Loading reloadble property file from path : "  + RELOADBLE_PROPERTY_FILENAME);
                }else{
                    log.info("Error: reloadble property file not Found : "  + RELOADBLE_PROPERTY_FILENAME);
                    }
            } // end of if
          } catch (ConfigurationException e) {
          //  e.printStackTrace();
              log.debug(e.getStackTrace().toString());
        }
    }
    public static synchronized String getProperty(final String key)
    {
        if(reloadConfiguration != null){
            if(getReloadableProperty(key) != null){
                return getReloadableProperty(key);
            }
            else
                return  configuration.getString(key);
        }
        else
            return  configuration.getString(key);
    }
    private static synchronized String getReloadableProperty(final String key)
    {
        return  reloadConfiguration.getString(key);
    }
    public static void main(String[] args) {
        System.out.println(RELOADBLE_PROPERTY_FILENAME);
    }
}
=========================================
RELOAD_PROERTY_FILENAME=C:/config.properties
#DB Properties
db-url=jdbc:db2://127.0.0.1:3306/test
db-username=jini
db-password=123
=========================================
import com.jini.util.ConfigUtil;
public class zzZZTestReloading {
    public static void main(String[] args)
    {
        while(true)
        {
            try
            {
                Thread.sleep(2000);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
                System.out.println(ConfigUtil.getProperty("DATASOURCE_ENABLE=TRUE"));
        }
    }
}