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

Project description


A Python to Java bridge.


jtypes.pyjava is a bridge allowing to use Java classes in regular Python code.

PyPI record.


jtypes.pyjava is an almost fully compliant implementation of Remi Rampin’s PyJava package by reimplementing whole its functionality in a clean Python instead of C.
jtypes.pyjava package is closely based on the jvm and jni Python packages.

About PyJava:

Borrowed from the original website:

PyJava is a bridge allowing to use Java classes in regular Python code.
It is similar to JPype.

It is a C extension that uses JNI to access a Java virtual machine, meaning that it can be used anywhere Python is available. It is not a different interpreter like Jython and does not require anything, other than a JRE. The JVM dynamic library is load dynamically through pyjava.start() (some basic logic for locating this library on major platforms will be provided).

The integration with Java code is meant to be as complete as possible, allowing to use Java and Python objects seemlessly and converting objects back and forth when Java code is called. Furthermore, subclassing Java classes or interfaces in Python code to allow callback from Java is planned for the 0.2 version.

Please note that this extension is still at a very early stage of development and probably shouldn’t be used for anything.


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



To install run:

python -m pip install --upgrade jtypes.pyjava



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

    python -m pip install --upgrade tox

Visit development page.

Installation from sources:

clone the sources:

git clone jtypes.pyjava

and run:

python -m pip install ./jtypes.pyjava

or on development mode:

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


Copyright (c) 2016-2022 Adam Karpierz
Licensed under the MIT License
Please refer to the accompanying LICENSE file.



0.1.5b6 (2022-01-29)

  • Drop support for Python 3.6.

  • Setup update.

0.1.5b5 (2021-10-16)

  • dll_path argument of JVM() can also be type os.PathLike.

  • Copyright year update.

  • Setup update.

0.1.5b2 (2020-11-10)

  • Fix for exception handling in start(…).

  • Add support for Python 3.8 and 3.9.

  • Drop support for Python2.

  • General update, improvements and cleanup.

  • Setup update.

0.1.5a10 (2019-07-10)

  • Last release for Python2.

0.1.5a9 (2018-11-08)

  • Update of the required setuptools version.

  • Minor setup and tests improvements.

0.1.5a5 (2018-05-22)

  • Update of the required setuptools version.

0.1.5a4 (2018-02-26)

  • Improvement and simplification of setup and packaging.

0.1.5a3 (2018-01-29)

  • Development moved to github.

  • General improvements and update.

0.0.16a1 (2017-05-13)

0.0.15a2 (2017-01-03)

  • Next alpha releases.

0.0.10a1 (2016-09-24)

  • First alpha release.

0.0.1 (2016-01-05)

  • Initial version.

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