Issue1394

Serialization of Jython objects that implement Serializable is bugged in
Java - across a new instance of the JVM.  

Serializing and reading in from the same instance of the JVM works fine.

When reading in from a different instance of the JVM, the JVM throws an
exception about the Jython proxy class not being found.

Can you provide the output of the actual exception?

OK... I've also added the Java/Python code that causes this problem.

Exception in thread "main" java.lang.ClassNotFoundException:
org.python.proxies.main$PyTest$0
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:621)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1592)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
	at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
	at Test.main(Test.java:28)

I'm pretty sure this is expected behavior on the JVM. Clamp offers a solution by allowing seralVersionUUID to be pinned (by default to 1L); please see https://github.com/jimbaker/clamped for an example.

We should document this functionality for Clamp as well.