pyrolite - java error if remote object includes further libs in called method

Hi,

I am very happy about Pyro4 and pyrolite but I have an issue in using pyrolite with Java.

The following simple example works fine:

import Pyro4
import numpy as np

class S3CsvReader(object):
    def __init__(self):
        self.x = np.array([1.0, 2.0])

    def get_data(self):
        return [1.0, 2.0, 3.0]

if __name__ == '__main__':
    Pyro4.config.HMAC_KEY = '0000'
    rdr = S3CsvReader()
    daemon = Pyro4.Daemon(port=51300)
    uri = daemon.register(rdr, "rdr")
    daemon.requestLoop()

... but if I change get_data to:

    def get_data(self):
        return list(self.x)

... an Java exception occurs:

Exception in thread "main" net.razorvine.pickle.PickleException: expected zero arguments for construction of ClassDict
        at net.razorvine.pickle.objects.ClassDictConstructor.construct(ClassDictConstructor.java:25)
        at net.razorvine.pickle.Unpickler.load_reduce(Unpickler.java:597)
        at net.razorvine.pickle.Unpickler.dispatch(Unpickler.java:164)
        at net.razorvine.pickle.Unpickler.load(Unpickler.java:83)
        at net.razorvine.pickle.Unpickler.loads(Unpickler.java:96)
        at net.razorvine.pyro.PyroProxy.call(PyroProxy.java:191)
        at net.razorvine.pyro.PyroProxy.call(PyroProxy.java:109)
        at de.draeger.run.model.test_pyro_lmm.TestPyroLmm.main(TestPyroLmm.java:24)

The Java code is like this:
            Config.HMAC_KEY = "0000".getBytes("UTF-8");
            PyroProxy remoteobject = new PyroProxy("localhost", 51300, "rdr");
            Object result = remoteobject.call("get_data");
            ArrayList<Double> message = (ArrayList<Double>) result;
            System.out.println("result message=" + message);
            remoteobject.close();

I have
Python 2.7.3
Java 7
Pyro 4.18
Windows 7 (64bit but using the 32bit versions of Python and Java)

I tried Pyro4 4.20 but I get a incompatibility with the protocol even if I set
Pyro4.config.SERIALIZER = 'pickle'

Thanks a lot,
Thomas
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