Error during generating .java classes for yang files using jnc

[shvishnu]

Hello,

We are seeing below errors when trying to generate .java classes from yang files using jnc

pyang -f jnc --jnc-output src/gen
Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 800, in _search
iterate(stmt.i_children, acc)
AttributeError: i_children

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 552, in pairwise
item = next(iterator) # throws StopIteration if empty.
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/local/bin/pyang", line 493, in
run()
File "/usr/local/bin/pyang", line 462, in run
emit_obj.emit(ctx, modules, fd)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 208, in emit
self.generate_from(module)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 247, in generate_from
generator.generate()
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 998, in generate
self.generate_classes()
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 1097, in generate_classes
child_generator.generate()
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 1000, in generate
self.generate_class()
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 1202, in generate_class
field = self.generate_child(ch)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 1286, in generate_child
child_gen = MethodGenerator(sub, self.ctx)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 1884, in init
search(stmt, yangelement_stmts | leaf_stmts)]
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 804, in search
search(stmt, keywords, dict)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 802, in _search
iterate(stmt.substmts, acc)
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 779, in iterate
key = ' '.join([ch.keyword, camelize(ch.arg)])
File "/usr/local/lib/python3.8/dist-packages/pyang/plugins/jnc.py", line 589, in camelize
for character, next_character in iterator:
RuntimeError: generator raised StopIteration

Please help identify the exact error here. The error is seen for only a handful of yang files. For remaining yang files, the java classes are generated without any errors/warnings.

Thanks,
Shrikant

[jvikman]

Do you get this error for any YANG model or is it some specific models that this happens with?

[jvikman]

Have you asked your question on https://github.com/tail-f-systems/JNC/issues ?

[shvishnu]

I had posted it on discussions page https://github.com/tail-f-systems/JNC/discussions/134
Now I posted on the issues page https://github.com/tail-f-systems/JNC/issues/135

Thank you

[shvishnu]

I got this error for a few of the yang models like tailf-ncs.yang. Other yang models are being converted to POJO just fine.

[shvishnu · Accepted solution]

Seems like the issue was with Python version(3.7). Followed the solution mentioned in link and the issue was fixed.