code: private static void propertyNullCheck(String dbType, String host, String port, String dbName)
      {
  
          if (dbType == null || dbType.isEmpty())
          {
              LOGGER.error("Property '" + EthConstants.DATABASE_TYPE + "' can't be null or empty");
              throw new KunderaException("Property '" + EthConstants.DATABASE_TYPE + "' can't be null or empty");
          }
  
          if (host == null || host.isEmpty())
          {
              LOGGER.error("Property '" + EthConstants.DATABASE_HOST + "' can't be null or empty");
              throw new KunderaException("Property '" + EthConstants.DATABASE_HOST + "' can't be null or empty");
          }
  
          if (port == null || port.isEmpty())
          {
              LOGGER.error("Property '" + EthConstants.DATABASE_PORT + "' can't be null or empty");
              throw new KunderaException("Property '" + EthConstants.DATABASE_PORT + "' can't be null or empty");
          }
  
          if (dbName == null || dbName.isEmpty())
          {
              LOGGER.error("Property'" + EthConstants.DATABASE_NAME + "' can't be null or empty");
              throw new KunderaException("Property '" + EthConstants.DATABASE_NAME + "' can't be null or empty");
          }
  
      }
docs: Property null check.
  
  @param dbType
  the db type
  @param host
  the host
  @param port
  the port
  @param dbName
  the db name