code: private void init() throws ConfigFileIOException {
          this.props = new Properties();
          log.info("Reading config file: {}", this.configFile);
          boolean ok = true;
          try {
              // El fichero esta en el CLASSPATH
              this.props.load(SystemConfig.class.getResourceAsStream(this.configFile));
          } catch (Exception e) {
              log.warn("File not found in the Classpath");
              try {
                  this.props.load(new FileInputStream(this.configFile));
              } catch (IOException ioe) {
                  log.error("Can't open file: {}", ioe.getLocalizedMessage());
                  ok = false;
                  ioe.printStackTrace();
                  throw new ConfigFileIOException(ioe.getLocalizedMessage());
              }
          }
          if (ok) {
              log.info("Configuration loaded successfully");
              if (log.isDebugEnabled()) {
                  log.debug(this.toString());
              }
          }
      }
docs: Inicializa la configuracion.