code: public String getRequiredString(String name) {
          String value = getString(name, null);
          if (value != null) {
              return value.trim();
          }
          throw new PippoRuntimeException("Setting '{}' has not been configured!", name);
      }
docs: Returns the string value for the specified name.  If the name does not
  exist an exception is thrown.
  
  @param name
  @return name value