How to use the pygw.config.java_pkg function in pygw

def set_protocol(self, protocol):
        """
        Sets the protocol of the connection to use. Either 'http' or 'https'.

        Args:
            protocol (str): The protocol to use.
        """
        if protocol is None:
            j_protocol = None
        else:
            j_protocol = java_pkg.com.amazonaws.Protocol.valueOf(protocol.upper())
        self._java_ref.setProtocol(j_protocol)

def set_region(self, region):
        """
        Sets the AWS region of the DynamoDB data store. For example `us-east-1`
        (specify either endpoint or region not both).

        Args:
            region (str): The AWS region to use.
        """
        if region is None:
            j_region = None
        else:
            j_region = java_pkg.com.amazonaws.regions.Regions.fromName(region)
        self._java_ref.setRegion(j_region)

def __init__(self):
        j_filter_factory = java_pkg.org.geotools.filter.FilterFactoryImpl()
        super().__init__(j_filter_factory)

def _j_match_action(match_action):
    return java_pkg.org.opengis.filter.MultiValuedFilter.MatchAction.valueOf(match_action.upper())