Problem with jython-shaded-2.7.0

[gildasmorvan]

Dear scripting-jython developers,

I encountered a problem with scijava kernel related to jython-shaded-2.7.0. When executing my code with that version of jython I had the following error when calling the constructor of a superclass (coded in java):

TypeError: Default constructor failed for Java superclass

Since my code was running well outside jupyter with jython 2.7.1 I replaced jython-shaded-2.7.0.jar by jython-shaded-2.7.1.jar that I found there. And now everything runs normally 😀

So I think it would be a good idea to upgrade jython-shaded in scripting-jython.

Best regards,

Gildas

Note 1: my code can be found there

Note 2: I also opened the same issue there thinking it was related to scijava-jupyter-kernel.

[ctrueden]

We have not upgraded to 2.7.1 yet due to this serious performance bug, as discussed on this forum thread.

Unfortunately, it seems like a fix for the performance issue is very tricky, and probably not forthcoming any time soon. Maybe we should go to 2.7.1 for the bug-fixes, and live with the worse performance in some situations? What do you think?

[gildasmorvan]

I am certainly not the best person to answer that question since I am not a jython/python expert. However, I did not notice performance issues with jython 2.7.1. Have you?

[ctrueden]

I have not played with it much, to be honest. But the bug you describe is serious enough that I'm going to upgrade our software stack, including this component, to use 2.7.1 now. And if there are grievous problems because of it, we can discuss whether to roll back.

Thanks again for the bug report, @gildasmorvan!