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A Python to Java bridge (ctypes/cffi-based JPype).

Project description

Currently only as placeholder (because a base package jtypes.jvm is still in development)


A Python to Java bridge.


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

PyPI record.

jtypes.jpype is a lightweight Python package, based on the ctypes or cffi library.
It is an almost fully compliant implementation of Steve Menard’s JPype package by reimplementing whole its functionality in a clean Python instead of C/C++.

About JPype:

Borrowed from the original website:

JPype 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.

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.


  • Either the Sun/Oracle JRE/JDK or OpenJDK.



To install run:

python -m pip install --upgrade jtypes.jpype

To ensure everything is running correctly you can run the tests using:

python -m jt.jpype.tests


Visit development page

Installation from sources:

Clone the sources and run:

python -m pip install ./jtypes.jpype

or on development mode:

python -m pip install --editable ./jtypes.jpype


  • Development is strictly based on tox. To install it run:

    python -m pip install tox


Copyright 2013-2018 Adam Karpierz

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



0.6.3b3 (2018-11-08)

  • Synchro with JPype master branch.
  • Update of the required setuptools version.
  • Minor setup and tests improvements.

0.6.3b1 (2018-05-22)

  • Synchro with JPype master branch.
  • Update of the required setuptools version.

0.6.2b5 (2018-03-13)

  • Improvement and simplification of setup and packaging.

0.6.2b3 (2018-01-29)

  • Development moved to github.
  • General improvements and update.

0.6.2b1 (2017-01-19)

  • Synchro with JPype release.

0.6.1b3 (2017-01-01)

  • Third beta release.

0.6.1b1 (2016-12-04)

  • Second beta release.

0.6.1b1 (2016-09-24)

  • First beta release.

0.1.1b0 (2013-10-05)

  • Initial version.

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