Java programming with JNI 2025

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This document is a tutorial on the Java Native Interface (JNI), aimed at introductory-level programmers. It explains how to call C or C++ code from Java and vice versa, detailing the essential steps involved in using JNI, including writing and compiling Java code, creating header files, implementing native methods in C/C++, and running applications. The tutorial also covers advanced topics such as exception handling, multithreading, and the differences between Java and C/C++ data types. It emphasizes the importance of understanding both programming environments to effectively utilize JNI.

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What is the difference between JNI and JNA?

JNI requires compiling native code and setting up header files and libraries, which can be cumbersome, while JNA only requires loading native libraries, making it simpler to set up.

What is the difference between JNI and NDK?

NDK is used in application developed for multiple platforms like iOS, Windows. Apps like Whatsapp, Instagram were developed using NDK. Java code use JNI(Java Native Interface)to call functions from native library, like accessing the objects, methods, etc. Also the native code can access the java environment.

What are the disadvantages of JNI?

Security Concerns: JNI can expose Java applications to security vulnerabilities, such as buffer overflows or accessing restricted memory areas. Since native code runs with the same privileges as the Java application, mistakes can lead to serious security risks.

What replaced JNI in Java 17?

JDK 17 introduces a much easier way to integrate with code and data outside of the Java runtime the Foreign Function Memory (FFM) API. As described in the JEP, it replaces the Java Native Interface (JNI) with a superior, pure Java development model. Heres an example from the OpenJDK website. More details here.

Is JNI deprecated?

It is not a goal to deprecate JNI or to remove JNI from the Java Platform. It is not a goal to restrict the behavior of native code called via JNI. For example, all of the native JNI functions will remain usable by native code.

How to call Java method from JNI?

You can call an instance method by following these three steps: Your native method calls the JNI function GetObjectClass , which returns the Java class object that is the type of the Java object. Your native method then calls the JNI function GetMethodID , which performs a lookup for the Java method in a given class.

How to compile JNI code?

Dont worry if youre new to this well break it down step by step. Step 1: Create a Native Method in Java. Step 2: Compile the Java Class and Generate a Header File. Step 3: Create a C File. Step 4: Compile the C Code into a Dynamic Library. Step 5: Run the Java Program.

Java programming with JNI 2025

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