[Jython-users] Serializable classes

[Ranjan B. <ran...@fr...>]

Hi --

Is there any magic I need to do to make Jython objects deserialize correctly?  I was experimenting with having a Jython class implement Serializable -- to be honest, I expected to see it blow up when I sent it to an ObjectOutputStream -- but that worked.

However, when I deserialize it, I get a ClassNotFound exception.

Here's the code:

import java
class MyClass(java.io.Serializable):
    def __init__(this, x):
        this.x = x

obj = MyClass(33)
baos = java.io.ByteArrayOutputStream()
oos = java.io.ObjectOuputStream(baos)
oos.writeObject(obj)
## good so far
ois = java.io.ObjectInputStream(java.io.ByteArrayInputStream(baos.toByteArray()))
ois.readObject()
Traceback (innermost last):
  File "<console>", line 1, in ?
java.lang.ClassNotFoundException: org.python.proxies.__main__$MyClass$0
        at java.net.URLClassLoader$1.run(URLClassLoader.java:201)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:189)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:308)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:324)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:212)
        at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:546)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1491)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1413)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1604)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:323)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java
)
        at org.python.core.PyMethod.__call__(PyMethod.java)
        at org.python.core.PyObject.__call__(PyObject.java)
        at org.python.core.PyInstance.invoke(PyInstance.java)
        at org.python.pycode._pyx11.f$0(<console>:1)
        at org.python.pycode._pyx11.call_function(<console>)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)
        at org.python.core.Py.runCode(Py.java)
        at org.python.core.Py.exec(Py.java)
        at org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
        at org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.java)
        at org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java)
        at org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java)
        at org.python.util.InteractiveConsole.push(InteractiveConsole.java)
        at org.python.util.InteractiveConsole.interact(InteractiveConsole.java)
        at org.python.util.jython.main(jython.java)

java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: org.python.proxies.__main__$MyClass$0


Any hints -- my suspicion is that it's something deep in the java security mechanism...

Ranjan