Originally posted by Michael Morris:
This is just a shot in the dark, but have you thought about compiling both with the 1.4 compiler and using the -target flag when compiling for 1.3?
javac -target 1.3 MyConnectionClass.java.
I tried a test class using Savepoint and it compiled without complaint. I also thought about using a custom ClassLoader, but if you try to define a class that starts with "java." a SecurityException is thrown.