Segfault/NullPointerException using PythonJavaClass as proxy between Java and Python

[kviktor]

I created a class that implements one method of a built-in Java interface using PythonJavaClass. My class' constructor takes a function as the first argument and when the method I implemented is called it calls that function. After I initialize the class I simply pass it to my Activity instance and when I receive certain broadcasts I call the implemented method from Java to do the "callback" to Python.

Using this method up to now these 3 things have happened

• the Activity segfaults
• the call throws a NullPointerException (I implemented a method that returns a boolean and the exception is about "cannot unbox null value to boolean" or something similar)
• things work flawlessly

One workaround I found was moving around the Python part of the code where I pass my class' instance to the Activity to different methods/functions. This fixed the issue however sometimes it creates DRY violations.

Has anyone experienced anything similar and came up with a more elegant solution?

[drmoose]

Does your PythonJavaClass subclass reliably call super().__init__? Because if not, the segfaulting could be #301, which is addressed by PR #299.

[kviktor]

I used that PR for my pyjnius build so I think it calls the init.

[github-actions]

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