java python bridge example

August 5, 2021 - A bi-directional Python-Java bridge used to embed Java in CPython or the other way round. - bcdev/jpy

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Languages C 54.6% | Java 25.9% | Python 18.7%

pytz

pythonhosted.org › javabridge

javabridge: running and interacting with the JVM from Python — python-javabridge 1.0.12 documentation

Python code can interact with the JVM using a low-level API or a more convenient high-level API. The javabridge was developed for CellProfiler, where it is used together with python-bioformats to interface to various Java code, including Bio-Formats and ImageJ.

Discussions

Java and CPython compatibility bridge

What are the differences to Py4J ? (except magic imports) More on reddit.com

r/ProgrammingLanguages

4

15

March 26, 2021

Best way to combine Python and Java?

I've used JPype for a while. It also starts a JVM from python. Once set up, interoperating with Java is transparent. You can start the JVM in such a way that it can be debugged directly using remote debugging tools. More on reddit.com

r/java

82

60

October 29, 2022

Py4J - A Bridge between Python and Java

That's cool. So you have to have a java program running before you use the Python code?

Videos

27:57

YouTube

Javonet - Bridging Python to Java - YouTube

October 30, 2024

48:40

YouTube

Power Up Your Java Using Python With JPype - YouTube

December 8, 2023

11:53

YouTube

Shortest Bridge - LeetCode #934 Python, JavaScript, Java and C++ ...

May 22, 2023

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Deephaven

deephaven.io › core › docs › how-to-guides › use-jpy

Use jpy | Deephaven

This means you can call any Java function from your Python program. Static methods are methods that belong to the type rather than to an instance of the type. Static methods can be called directly from the return value of jpy.get_type. This example uses the valueOf static method from the java.lang.String type.

GeoAPI

geoapi.org › java-python

GeoAPI Java-Python bridge | GeoAPI

May 5, 2025 - The first line in the example below assumes that a Java class named com.mycompany.MyClass contains a static getMetadata() method. That method is invoked from Python code, and its return value is wrapped in a Python object provided by JPY. If the caller knows that the return type is GeoAPI interface org.opengis.metadata.Metadata, then (s)he can wrap the return value in opengis.bridge.java.metadata.Metadata in order to manipulate that object using GeoAPI for Python interfaces.

Talvi

talvi.net › posts › a-brief-overview-of-python-java-bridges-in-2020.html

A brief overview of Python-Java bridges in 2020 - talvi.net

January 10, 2020 - The jep executable can be used to run a Python script directly, or the script can be invoked from Java. When running via the jep executable, third-party jars can be used by setting the CLASSPATH variable, but they cannot be specified within the Python script itself. Here is an example of usage from the Python side:

PyPI

pypi.org › project › python-javabridge

python-javabridge · PyPI

The python-javabridge package makes it easy to start a Java virtual machine (JVM) from Python and interact with it. Python code can interact with the JVM using a low-level API or a more convenient high-level API.

      » pip install python-javabridge

Published Sep 13, 2024

Version 4.0.4

Homepage http://github.com/CellProfiler/python-javabridge/

GitHub

github.com › beeware › rubicon-java

GitHub - beeware/rubicon-java: A bridge interface between Python and Java. · GitHub

A Java JAR file. A Makefile has been provided to compile the JNI and JAR components. Type: ... The Rubicon library file is somewhere that it will be found by dynamic library discovery. This means: Under OS X, put the directory containing librubicon.dylib is in your DYLD_LIBRARY_PATH · Under Linux, put the directory containing librubicon.so is in your LD_LIBRARY_PATH · Under Windows.... something :-) The rubicon Python module is somewhere that can be added to a PYTHONPATH.

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Forked by 28 users

Languages Python 68.4% | C 20.3% | Java 8.6% | Makefile 2.7%

GitHub

github.com › LeeKamentsky › python-javabridge

GitHub - LeeKamentsky/python-javabridge: Python wrapper for the Java Native Interface

PyPI record: https://pypi.python.org/pypi/javabridge

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Forked by 64 users

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Readthedocs

jpy.readthedocs.io

Welcome to jpy’s documentation! — jpy 0.9.0 documentation

jpy is a bi-directional Java-Python bridge allowing you to call Java from Python and Python from Java.

Readthedocs

jpy.readthedocs.io › en › latest › intro.html

Introduction — jpy 0.9.0 documentation

jpy is a bi-directional Python-Java bridge which you can use to embed Java code in Python programs or the other way round. It has been designed particularly with regard to maximum data transfer speed between the two languages.

Pythonpodcast

pythonpodcast.com › jpype-java-python-bridge-episode-286

The Python Podcast.__init__: Power Up Your Java Using Python With JPype

Python and Java are two of the most popular programming languages in the world, and have both been around for over 20 years. In that time there have been numerous attempts to provide interoperability between them, with varying methods and levels of success. One such project is JPype, which allows you to use Java classes in your Python code.

Py4j

py4j.org

Welcome to Py4J — Py4J

This is the Java program that was executing at the same time (no code was generated and no tool was required to run these programs). The AdditionApplication app instance is the gateway.entry_point in the previous code snippet. Note that the Java program must be started before executing the Python code above.

Rpaframework

rpaframework.org › libraries › javaaccessbridge › python.html

Python API — RPA Framework documentation

The library utilizes java-access-bridge-wrapper package to interact with Java UI.

PyPI

pypi.org › project › javabridge

javabridge · PyPI

The python-javabridge package makes it easy to start a Java virtual machine (JVM) from Python and interact with it. Python code can interact with the JVM using a low-level API or a more convenient high-level API.

      » pip install javabridge

Published May 26, 2020

Version 1.0.19

Homepage http://github.com/CellProfiler/python-javabridge/

reddit.com › r/programminglanguages › java and cpython compatibility bridge

r/ProgrammingLanguages on Reddit: Java and CPython compatibility bridge

March 26, 2021 -

I've implemented support for two-way compatibility between Java and Python/CPython, meaning that Java can import standard CPython modules and use code as if it were Java, and Python can import Java classes and use them as if they were Python classes.

Imports in both languages are done with standard import statements.

How It Works

Java code imported into Python is subjected to reflection and then Python wrapper classes are generated using the Python API that provide runtime translations between the two language runtimes. A native Python module is provided that provides the "magic import" functionality from Java to Python (https://qoretechnologies.com/manual/qorus/current/python/html/index.html#python_qoreloader_import_java).

Python code imported into Java is introspected using the Python C API and then bytecode is generated for Java wrapper classes that provide a similar runtime translation as the imports in the other direction. A custom compiler based on javax.tools is provided (QoreJavaCompiler docs) as well as runtime dynamic code generation support for wrapper APIs in a custom class loader (QoreURLClassLoader - more info with some code examples here: https://qoretechnologies.com/manual/qorus//gitlab-docs/develop/jni/html/index.html).

This is all accomplished using a third language called Qore that provides the functionality of a "language bridge" and also manages the references to data in each separate runtime. Because Qore has a deterministic garbage collector, strong references to Python and Java data are managed in Qore and released when there are no more valid references to the data (in Qore - therefore various tricks are used to manage references transparently including sing thread-local data; there is also the possibility of using custom reference handlers to maintain the validity of objects using different language runtimes and garbage collection implementations). A high level description of the approach is here: https://drive.google.com/file/d/1QfzoXKoqgm6s1wTTykB0VdnIo4j5p0oK/view?usp=sharing

While support for importing Java into Python has been released, importing Python into Java will be released in April 2021 but is currently working and stable.

The idea is to facilitate the mixed use of enterprise technologies (Java) and AI / data science technologies (Python).

All of the source code required has been released under permissive open source licenses (MIT).

I hope it could be interesting and useful for someone - happy to provide more information if there's interest.

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What are the differences to Py4J ? (except magic imports)

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Notmyidea

blog.notmyidea.org › using-jpype-to-bridge-python-and-java.html

Using JPype to bridge python and Java - Alexis Métaireau

This means you need to start a VM from your python script, but it does the job and stay fully compatible with Cpython and its C extensions. Once JPype installed (you’ll have to hack a bit some files to integrate seamlessly with your system) you can access java classes by doing something like that: import jpype jpype.startJVM(jpype.getDefaultJVMPath()) # you can then access to the basic java functions jpype.java.lang.System.out.println("hello world") # and you have to shutdown the VM at the end jpype.shutdownJVM()

pytz

pythonhosted.org › javabridge › java2python.html

Calling Python from Java — python-javabridge 1.0.12 documentation

The Javabridge loads a Java class, org.cellprofiler.javabridge.CPython, that can be used to execute Python code.

en.proft.me

en.proft.me › 2017 › 01 › 7 › bridge-design-pattern-java-and-python

Bridge design pattern in Java and Python | en.proft.me

We are demonstrating use of Bridge pattern via following example in which a circle can be drawn in different colors using same abstract class method but different bridge implementer classes.

PyPI

pypi.org › project › jpy

jpy · PyPI

jpy is a bi-directional Python-Java bridge which you can use to embed Java code in Python programs or the other way round. It has been designed particularly with regard to maximum data transfer speed between the two languages.

      » pip install jpy

Published Jun 04, 2026

Version 2.1.0

Homepage https://github.com/jpy-consortium/jpy

Awesomeopensource

awesomeopensource.com › projects › bridge › java › python

The Top 7 Bridge Java Python Open Source Projects

JPype is cross language bridge to allow Python programs full access to Java class libraries.