How can I force a Python ScriptEngine to flush its cache of imported modules?

I am using a Python ScriptEngine in my Java application to execute a Python script that imports various other Python scripts. Once the main script successfully completes and the eval method returns, I set the engine object reference to null and call the garbage collector. Next I go and edit one of the scripts that was imported by the main script and save it. Next I run the method to execute the main Python script as before by creating a new ScriptEngine object and calling eval, but when the main script runs it does not pick up the changes to the imported script that I made. Obviously the imported scripts are being cached somewhere by something, maybe Jython? I do not want to call reload in the Python script. There must be a way to tell whatever is doing the caching to flush or clear itself. Anyone found a solution to this problem? I am using NetBeans 8.0.2, Java 1.8 update 45, and Jython 2.7 on Windows 7.