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Return the actual Java Exception object on Exception?

See original GitHub issue

Hi!

Just wondering, I couldn’t seem to be able to get the actual Java Exception object returned as an Exception? Is this by design, or is this something that could be part of future features?

For example, it would be nice to be able to do:

MyException = jnius.autoclass("myjavaprogram.exceptions.MyException")
MyClass = jnius.autoclass("myjavaprogram.MyClass")
try:
  MyClass.doSomethingThatThrowsAnException()
except MyException:
  # Do something
  pass
except JavaException:
  # Do something else
  pass

As an addendum, MyException would also have to inherit from jnius.JavaException

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Issue Analytics

State:
Created 8 years ago
Comments:8 (4 by maintainers)

Top GitHub Comments

1reaction

jcrotingercommented, May 8, 2020

Got it - thanks! It would be nice if the message included the method name, since it must be known.

I was able to print the stack trace with

      print("".join(traceback.TracebackException.from_exception(e).format()))

and sorted it out.

(The confusion was that the code had something like foo.bar(a.getX(), a.getY(), ...) where foo and a are Java objects. I assumed the problem was somewhere down in foo.bar and only later realized that it wasn’t getting that far. Debugging this interlanguage stuff can be a headache so more info in exceptions helps!)

0reactions

tshirtmancommented, May 7, 2020

i would assume there https://github.com/kivy/pyjnius/blob/master/jnius/jnius_export_class.pxi#L831-L836

which would mean the error didn’t happen in java, it happened in python before the call to the java function, so there is no java stacktrace to report.

edit: the latter part of the message (after “got {one}”) was added in the latest version of pyjnius, released last weekend, which also solved some bugs in the lookup of methods, you might want to upgrade and try with that version.

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