Pyjnius: Accessing Java classes from Python

http://txzone.net/2012/08/pyjnius-accessing-java-classes-from-python/

by txprog • 14 years ago

61 17 14 years ago

txzone.net

tehansen• 14 years ago

Deocumentation: http://pyjnius.readthedocs.org/en/latest/index.html

ikusalic• 14 years ago

I've used JPype in the past, but unfortunately it seems pretty much dead.

This looks really promising. Thank you for the hard work.

jpdus2• 14 years ago

Looks good!

Has anyone tried this for accessing a Java Socket API? (e.g. Interactive Brokers API) Im currently using Jython but would love to switch to "real" Python, unfortunately i am still a noob when it comes to get these things working..

jaytaylor• 14 years ago

@jpdus Will you elaborate on why you are eager to ditch Jython in favor of CPython? I guess I have a soft spot for Jython.

Overall this project looks very interesting- Can't wait to go through the source code at https://github.com/kivy/pyjnius to see how this works under the hood.

Cheers.

txprog3• 14 years ago

Mostly JNI, plus using our core class to use the java.reflect and discover methods and fields (you can't do it in JNI :/)

jpdus2• 14 years ago

@jaytaylor The main reason for my part is that most/all my projects are pure python so far and im way more familiar with (C)Python and its libraries (numpy/scipy fe), dependencies, etc. than i am with Java. I like Jython too, but if i had the opportunity to do everything in pure Python i would ditch it nevertheless!

bendemott• 14 years ago

Very promising, thanks for the great work!

__mharrison__• 14 years ago

Interesting. It would be great to see some docs touching on pros/cons vs jython, jpype, etc

I for one am interested in keeping everything in cpython if possible. But I currently have a web service in jython...

koenigdavidmj• 14 years ago

How does it handle the two types of exception?

txprog3• 14 years ago

When an exception from Java side is throw, we catch it, and raise our own JavaException python class.

mahmoudimus• 14 years ago

This is pretty much a perfect example of when to leverage import hooks.

tocomment• 14 years ago

Can you explain that a bit more?

d0mine• 14 years ago

So that you could:

  from java.util import Stack

Instead of:

  from jnius import autoclass
  Stack = autoclass('java.util.Stack')

http://www.doughellmann.com/PyMOTW/sys/imports.html#custom-i...

3amOpsGuy• 14 years ago

Does this mean we now have a convenient way to speak JMX from python? That would be very handy!

jnazario• 14 years ago

what's wrong with JCC?

http://lucene.apache.org/pylucene/jcc/index.html

i have used it a lot to generate JNI bindings for other code via a simple Makefile template (list JARs and packages, alter names and versions, and poof). it works quite often, but it does run into some wonky C++ code it can't quite figure out.

still, pretty easy. one example are some (work-private) mahout bindings.

kbd• 14 years ago

How are generics handled?

Pyjnius: Accessing Java classes from Python

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