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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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// Copyright 2000 Finn Bock
package org.python.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;

import org.python.core.Py;
import org.python.core.PyObject;
import org.python.core.PyTuple;
import org.python.core.PyType;
import org.python.core.__builtin__;

public class PythonObjectInputStream extends ObjectInputStream {

    public PythonObjectInputStream(InputStream istr) throws IOException {
        super(istr);
    }

    protected Class resolveClass(ObjectStreamClass v) throws IOException, ClassNotFoundException {
        String clsName = v.getName();
        if (clsName.startsWith("org.python.proxies")) {
            int idx = clsName.lastIndexOf('$');
            if (idx > 19) {
                clsName = clsName.substring(19, idx);
            }
            idx = clsName.indexOf('$');
            if (idx >= 0) {
                String mod = clsName.substring(0, idx);
                clsName = clsName.substring(idx + 1);
                PyObject module = importModule(mod);
                PyType pycls = (PyType)module.__getattr__(clsName.intern());
                return pycls.getProxyType();
            }
        }
        try {
            return super.resolveClass(v);
        } catch (ClassNotFoundException exc) {
            PyObject m = importModule(clsName);
            Object cls = m.__tojava__(Class.class);
            if (cls != null && cls != Py.NoConversion) {
                return (Class)cls;
            }
            throw exc;
        }
    }

    private static PyObject importModule(String name) {
        PyObject fromlist = new PyTuple(Py.newString("__doc__"));
        return __builtin__.__import__(name, null, null, fromlist);
    }
}