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BUG: AttributeError: Java package 'net' has no attribute 'sf' #38
Description
when running ork2json --filepath RocketPyTest.ork --ork_jar ../OpenRocket-24.12.jar --verbose True on Mac this error is reported:
2026-03-20 15:24:33,483 - WARNING - [ork2json] Output folder not specified. Using '.' instead.
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by org.jpype.JPypeContext in an unnamed module (file:/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/org.jpype.jar)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.14/bin/ork2json", line 7, in <module>
sys.exit(ork2json())
~~~~~~~~^^
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/click/core.py", line 1485, in __call__
return self.main(*args, **kwargs)
~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/click/core.py", line 1406, in main
rv = self.invoke(ctx)
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/click/core.py", line 1269, in invoke
return ctx.invoke(self.callback, **ctx.params)
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/click/core.py", line 824, in invoke
return callback(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/rocketserializer/cli.py", line 167, in ork2json
with orhelper.OpenRocketInstance(ork_jar, log_level="OFF") as instance:
~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/orhelper/_orhelper.py", line 53, in __enter__
self.openrocket = jpype.JPackage("net").sf.openrocket
^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Java package 'net' has no attribute 'sf'
Activity
Gui-FernandesBR commentedon Mar 22, 2026
seems like this issue is not related to the serializer itself.
I will investigate it and try to solve asap.
[-]BUG:[/-][+]BUG: AttributeError: Java package 'net' has no attribute 'sf'[/+]Austinthemighty commentedon Mar 28, 2026
I also noted that if a the output directory has a space in it, it throws an error
Gui-FernandesBR commentedon Mar 29, 2026
Hi @Austinthemighty, thank you for the detailed report and for flagging the spaces issue too!
Both problems should now be fixed in the latest push (merged via #39):
AttributeError: Java package 'net' has no attribute 'sf'This was caused by a breaking change in OpenRocket 24.12, which moved its Java package from
net.sf.openrockettoinfo.openrocket. We replaced theorhelperdependency with a customOpenRocketSessionclass that automatically handles both package paths, so it should work with older and newer OpenRocket versions alike.Spaces in the output directory path
This should also be resolved — the output path is now handled through Python
Pathobjects and passed as a list of arguments (not a shell string), which correctly handles paths with spaces.Note on Python 3.14: We currently test against Python 3.9 and 3.11. Python 3.14 is still in development and may have stricter JVM restrictions (as seen in the warnings about
--enable-native-access). We recommend using Python 3.11 for the best compatibility (for now).Please upgrade to the latest version of our
masterbranch and let us know if the issue persists!Austinthemighty commentedon Mar 31, 2026
Hi @Gui-FernandesBR Thank you for you help in fixing this, I will give it a test in the morning. for testing the master branch what should I run to test it?
Gui-FernandesBR commentedon Mar 31, 2026
Hi! To test the master branch fix, you can install directly from GitHub using pip:
If you're in a virtual environment, make sure it's activated first. If you had a previous version installed, add
--force-reinstallto make sure you get the latest:Also, as mentioned, if you're on Python 3.14 you may still see JVM warnings — switching to Python 3.11 is recommended for the smoothest experience right now.
Let us know how it goes!