Calling Java from Python: Which Library is the Best Choice in 2023?

Calling Java from Python: A Comprehensive Guide

Calling Java code from Python opens up a world of possibilities, allowing developers to leverage the strengths of both languages in their projects. While jython and RPC are not viable options, there are several alternative methods to consider.

JCC: C Layer Manipulation

JCC is a C code generator that facilitates calling Java from C or Python. However, it requires compiling specific calls, which can be cumbersome.

JPype: Legacy Solution

JPype has been around for a while and is a popular solution for invoking Java code from Python. Despite being a well-documented solution, its last release in January 2009 raises concerns about its ongoing support.

Py4J: Promising Alternative

[Py4J](https://www.py4j.org/) is an emerging solution that offers a seamless way to call Java methods from Python code. Unlike Jython, Py4J has one part running in the Python VM, ensuring compatibility with modern Python versions and libraries.

Using Py4J is straightforward and intuitive. Simply instantiate a JavaGateway object, import the desired Java class, and invoke its methods as if they were Python methods.

from py4j.java_gateway import JavaGateway
gateway = JavaGateway()
java_object = gateway.jvm.mypackage.MyClass()
java_object.doThat()

Communication via Sockets

Py4J utilizes sockets for communication between Python and Java, bypassing the need for JNI and providing optimization capabilities. Its custom protocol helps manage memory and enhance performance.

Conclusion

Py4J stands out as a promising solution for calling Java code from Python due to its active support, compatibility with modern Python versions, and efficient communication protocol.

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