As of this writing, the following code in fiji.py errors out:

    while True:
        if disposed.get(ctx):
            break
        sleep(0.1)

because once the JVM shuts down, the disposed.get(ctx) cannot work because disposed is a Java Field, and there is no more JVM available to operate upon it.

We need to come up with a better solution for blocking the main thread appropriately on all platforms and then handling program termination gracefully without errors or crashes.