from py4j.java_gateway import (
    JavaGateway, CallbackServerParameters, GatewayParameters,
    launch_gateway)

(port, token) = launch_gateway(enable_auth=True)

gateway = JavaGateway(
    gateway_parameters=GatewayParameters(port=port, auth_token=token),
    callback_server_parameters=CallbackServerParameters(port=0))

python_port = gateway.get_callback_server().get_listening_port()

gateway.java_gateway_server.resetCallbackClient(
        gateway.java_gateway_server.getCallbackClient().getAddress(),
            python_port)

gateway.close()

random = gateway.jvm.java.util.Random()
print([random.nextInt(100) for _ in range(10)])