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Python-Java bridge (ctypes/cffi-based Steve Menard's JPype)

Project description


Pure Python Java package


jtypes.jvm is a bridge between Python and Java JVM, allowing these to intercommunicate. It is an effort to allow python programs full access to Java class libraries.

jtypes.jvm is a lightweight Python Java package, based on the ctypes FFI library. It is a fork of Steve Menard’s good known JPype package by reimplementing whole it’s functionality in a clean Python instead of C/C++.

What is jtypes.jvm:

jtypes.jvm is an effort to allow python programs full access to Java class libraries. This is achieved not through re-implementing Python, as Jython/JPython has done, but rather through interfacing at the native level in both virtual machines.

Eventually, it should be possible to replace Java with python in many, though not all, situations. JSP, Servlets, RMI servers and IDE plugins are good candidates.

Once this integration is achieved, a second phase will be started to separate the Java logic from the Python logic, eventually allowing the bridging technology to be used in other environments, I.E. Ruby, Perl, COM, etc …

Known Bugs/Limitations :
  • Java classes outside of a package (in the <default>) cannot be imported.
  • Because of lack of JVM support, you cannot shutdown the JVM and then restart it.
  • Some methods rely on the “current” class/caller. Since calls coming directly from python code do not have a current class, these methods do not work. The User Manual lists all the known methods like that.


If you need assistance, you can ask for help on our mailing list:

We also have an IRC channel:

  • Server :
  • Port : 6667, 6697 (SSL only)
  • Channel : #kivy


pip install --upgrade jtypes.jvm



Copyright (c) 2004 - 2016 Adam Karpierz

Licensed under the Apache License, Version 2.0
Please refer to the LICENSE file.



0.1.1 (2005-10-05)

  • Initial version.

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