Message4857

It is not possible to inherit from a dynamically compiled Java class (
using the Java 6 Compiler API ) which wasn't previously dumped to a file
and reloaded.

In order to reproduce the failure case one needs the following Jython module

http://www.fiber-space.de/misc/jcompile.py

It defines the function

createJavaClass(classname : str, code : str ) -> type

which keeps a classname and a Java source string and returns a new
Jython class which wraps the compiled and loaded Java class. The
following code is an example:

code = '''
public class Foo
{
    public static int f(int i)
    {
        return i*3;
    }
}'''

Foo = createJavaClass("Foo", code)

The result is a new Jython class Foo that works as expected:

print Foo    #  <type 'Foo'>
Foo.f(5)     #  = 15

However, if one intends to subclass Foo one gets following exception

class Bar(Foo): pass

Traceback (most recent call last):
  File "C:\lang\Jython\jannotations.py", line 185, in <module>
    class Bar(Foo):pass
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: 
org/python/core/PyProxy (wrong name: Foo)