JPype documentation

JPype is a Python module to provide full access to Java from within Python. It allows Python to make use of Java specific libraries, explore and visualize Java structures, develop and test Java libraries, make use of scientific computing, and much more. By enabling the use of Python for rapid prototyping and Java for strong typed production code, JPype provides a powerful environment for engineering and code development.

Unlike Jython, JPype does not achieve this by re-implementing Python, but instead by interfacing both virtual machines at the native level. This shared memory based approach achieves good computing performance, while providing the access to the entirety of CPython and Java libraries.

Parts of the documentation

• Installation
  • Binary Install
  • Source Install
  • Path requirements
  • macOS: JVM DLL not found on Apple Silicon
  • Known Bugs/Limitations
• JPype User Guide
  • Introduction
  • JPype Types
  • Controlling the JVM
  • Customization
  • Collections
  • Serialization with JPickler
  • Working with NumPy
  • Calling Python Code from Java
  • AWT/Swing
  • Concurrent Processing
  • Managing Cross-Platform GUI Environments
  • Miscellaneous topics
• Java QuickStart Guide
  • Starting JPype
  • Classes/Objects
  • Exceptions
  • Primitives
  • Strings
  • Arrays
  • Collections
  • Reflection
  • Implements and Extension
• API Reference
  • JVM Functions
  • Class importing
  • Class Factories
  • Java Types
  • Threading
  • Decorators
  • Proxies
  • Customized Classes
  • Modules
• JPype DBAPI2 Guide
  • Introduction
  • Module Interface
  • Type Access
  • Connection Objects
  • Cursor Objects
  • SQL Type Constructors
  • JDBC Types
  • Working with pandas
  • Working with Polars
  • Connection pooling with DBUtils
  • Concurrency
  • Working with Apache Drill
  • Conclusion
• JImport
  • Setup
  • Import Styles
  • 1) Import of the package path
  • 2) Import of the package path as a module
  • 3) Import a class from an object
  • Import caveats
• JPype for Android
  • Supported Functions
  • Functional differences
  • Removed JPype Services
  • Unsupported Java libraries
  • Behavior differences
• Android Build/Test Harness
  • Background: why buildozer/python-for-android
  • What’s in project/android/
  • Changes to core native/ and jpype/
  • Setup
  • Build, deploy, run, verify
  • Understood, not chased further: a trailing SIGABRT after every run
  • numpy
  • Stale rebuilds: when editing the jpype1 recipe or native/ itself
  • Reproducing a new Android bug report
  • Follow-up: porting test/jpypetest onto this harness
• Changelog
• Developer Guide
  • Overview
  • jpype module
  • _jpype CPython module
  • Java Slots
  • CPython API layer
  • C++ JNI layer
  • Java native code
  • Tracing
  • Coverage
  • Debugging issues
  • Deliberate Crash for Debugging
  • Future directions

Indices and tables

• Index

• Module Index

• Search Page