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Java Native Access (JNA) is a community-developed library that provides Java programs easy access to native shared libraries without using the Java Native Interface (JNI). JNA's design aims to provide native access in a natural way with a minimum of effort. Unlike JNI, no boilerplate or generated glue code is required.




Architecture


The JNA library uses a small native library called foreign function interface library (libffi) to dynamically invoke native code. The JNA library uses native functions allowing code to load a library by name and retrieve a pointer to a function within that library, and uses libffi library to invoke it, all without static bindings, header files, or any compile phase. The developer uses a Java interface to describe functions and structures in the target native library. This makes it quite easy to take advantage of native platform features without incurring the high development overhead of configuring and building JNI code.
JNA is built and tested on macOS, Microsoft Windows, FreeBSD / OpenBSD, Solaris, Linux, AIX, Windows Mobile, and Android. It is also possible to tweak and recompile the native build configurations to make it work on most other platforms that run Java.




Mapping types


The following table shows an overview of types mapping between Java and native code and supported by the JNA library.

Note: The meaning of TCHAR changes between char and wchar_t according to some preprocessor definitions. LPCTSTR follows.




Memory byte alignment for data structures


Native libraries have no standardized memory byte alignment flavor. JNA defaults to an OS platform specific setting, that can be overridden by a library specific custom alignment. If the alignment details are not given in the documentation of the native library, the correct alignment must be determined by trial and error during implementation of the Java wrapper.




Example


The following program loads the local C standard library implementation and uses it to call the printf function.
Note: The following code is portable and works the same on Windows and POSIX (Linux / Unix / macOS) platforms.

The following program loads the C POSIX library and uses it to call the standard mkdir function.
Note: The following code is portable and works the same on POSIX standards platforms.

The program below loads the Kernel32.dll and uses it to call the Beep and Sleep functions.
Note: The following code works only on Windows platforms.




See also



JNAerator
P/Invoke
SWIG




References






External links


Java Native Access Web Page
Java Native Access - Download page
Java Native Access - User Mailing List
Friesen, Jeff (5 February 2008). "Open source Java projects: Java Native Access". Open Source Java Tutorials. JavaWorld. Retrieved 2020-07-27.
Morris, Stephen B. (20 May 2009). "Protect Your Legacy Code Investment with JNA". today.java.net. Archived from the original on 2015-01-13.
Dasgupta, Sanjay (11 November 2009). "Simplify Native Code Access with JNA". today.java.net. Archived from the original on 2009-11-15.
Doubrovkine, Daniel (20 June 2011). "JNA is now a Githubber". code.dblock.org. Retrieved 2020-07-27.
Kiaer, Jesper (21 March 2010). "Calling the Lotus Domino C-API with JNA". Nevermind.dk. Retrieved 2020-07-27.

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Daftar Isi

• Java Native Access (JNA) - GitHub
• jna/www/GettingStarted.md at master · java-native-access/jna
• Java Native Access - GitHub
• dongshin/JNA: Java Native Access - GitHub
• java-native-access · GitHub Topics · GitHub
• iterate-ch/jna: Java Native Access - GitHub
• jna/www/PlatformLibrary.md at master · java-native-access/jna
• GitHub - netjunki/jna-android: Java Native Access
• GitHub - JetBrains/intellij-deps-jna: Version of Java Native Access ...
• jna/dist/jna.jar at master · java-native-access/jna - GitHub

Java Native Access (JNA) - GitHub

JNA provides Java programs easy access to native shared libraries without writing anything but Java code - no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes.

jna/www/GettingStarted.md at master · java-native-access/jna

Java Native Access (JNA) has a single component, jna.jar; the supporting native library (jnidispatch) is included in the jar file. JNA is capable of extracting and loading the native library on its own, so you don't need additional configuration.

Java Native Access - GitHub

Java Native Access. Java Native Access has one repository available. Follow their code on GitHub.

dongshin/JNA: Java Native Access - GitHub

JNA provides Java programs easy access to native shared libraries without writing anything but Java code - no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes.

java-native-access · GitHub Topics · GitHub

Nov 17, 2024 · Structured logging to systemd journal using native systemd libraries and JNA (Java Native Access)

iterate-ch/jna: Java Native Access - GitHub

JNA provides Java programs easy access to native shared libraries without writing anything but Java code - no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes.

jna/www/PlatformLibrary.md at master · java-native-access/jna

JNA contains two different approaches to binding COM object for access from java. Both mainly focus on late-time-binding/invoke usage. The first and older variant is found in the com.sun.jna.platform.win32.COM package.

GitHub - netjunki/jna-android: Java Native Access

JNA provides Java programs easy access to native shared libraries (DLLs on Windows) without writing anything but Java code—no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes. …

GitHub - JetBrains/intellij-deps-jna: Version of Java Native Access ...

JNA provides Java programs easy access to native shared libraries without writing anything but Java code - no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes.

jna/dist/jna.jar at master · java-native-access/jna - GitHub

Java Native Access. Contribute to java-native-access/jna development by creating an account on GitHub.