[x3d-public] Sample X3D Python API; examplespublishedforcontinuing improvement

[John Carlson]

Do you plan on removing X3D*Node.class from the X3DJSAIL jar?  This is far too much work and is leading in the WRONG direction. If I don’t import the class in Python application, I’m not using it, as far as I know. I will try to mess with leaving out the from in the import for each class at some point, and just use import as if that sounds like a good plan.

Set you teeth on this problem, which I can’t solve, last I checked (found in pyjnius folder):

$ python abox.future.py
Traceback (most recent call last):
  File "abox.future.py", line 64, in <module>
    .setProtoField(SFString("myShape")) \
  File "jnius\jnius_export_class.pxi", line 760, in jnius.JavaMethod.__call__
  File "jnius\jnius_conversion.pxi", line 78, in jnius.populate_args
  File "jnius\jnius_utils.pxi", line 205, in jnius.check_assignable_from
jnius.JavaException: Invalid instance of 'org/web3d/x3d/jsail/X3DConcreteNode' passed for a 'org/web3d/x3d/sai/Core/X3DNode'

Make sure your up to date with the latest org version (does not use  X3Dautoclass.py).

John
Sent from Mail for Windows 10

From: Brutzman, Donald (Don) (CIV)
Sent: Monday, April 22, 2019 10:57 PM
To: John Carlson
Cc: X3D Graphics public mailing list
Subject: Re: [x3d-public] Sample X3D Python API; examplespublishedforcontinuing improvement

Our messages crossed but are quite similar... we might have the problem surrounded I hope...

On 4/22/2019 8:45 PM, John Carlson wrote:
> This is a more broad problem than pyjnius, and is likely a Java problem that is letting things past the interface contract.  Okay, I will try to explain what the bug is:
> 
> setDEF in X3DViewpointNode returns an X3DViewpointNode (interface)
> 
> public X3DViewpointNode setDEF(String newValue);
[...]

Please make sure that you have _no_ references to abstract class X3DViewpointNode anywhere in your code.

The Java source for concrete class ViewpointObject specifically overrides its abstract parent superclass with an @Override annotation.  Inside X3DJSAIL the setDEF() method correctly returns type ViewpointObject.

If we remove all references to X3D*Node abstract classes everywhere and the problem still occurs, then
- perhaps not all of those definitions are removed, or
- perhaps an old file in the path is somehow visible, or
- we have isolated a bug in Pyjnius that we can ask them to fix.

Good luck sir.

all the best, Don
-- 
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman

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