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Using the Java Native Interface

Integrate Java code with code written in other languages

Date: 17 Nov 2011 |Level: Intermediate |

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1. Learn what JNI does

Understand the JNI framework's high-level concepts before putting them to use.

Read: Overview of JNI Item marked not complete - Click to mark complete

2. Get started using JNI

Start performing the two most common applications of JNI — calling C/C++ code from Java programs, and calling Java code from C/C++ programs — and learn how to avoid common JNI programming mistakes.

Practice: Java programming with JNI Item marked not complete - Click to mark complete

Read: Best practices for using the Java Native Interface Item marked not complete - Click to mark complete

3. Use JNI on UNIX and Linux platforms

Find out how to leverage the JNI implementation in IBM's Java developer kit when you develop applications for AIX or Linux on POWER systems.

Download: IBM developer kits for Java(Free download; multiple versions and platforms available) Item marked not complete - Click to mark complete

Read: JNI programming on AIX: Recommendations and tips Item marked not complete - Click to mark complete

Practice: JNI programming examples for Linux on POWER Item marked not complete - Click to mark complete

4. Leverage JNI on IBM i

Although the IBM JDK is optimized for IBM i, native methods written in IBM i integrated language environment (ILE) languages can access system-specific functions and APIs that aren't directly available in Java. Learn how JNI facilitates interoperability between the JVM and native methods. Then discover the advantages of moving a native method from the ILE to the IBM i Portable Application Solutions Environment (PASE).

Read: Native methods and the Java Native Interface Item marked not complete - Click to mark complete

Read: Adapting JNI for IBM Technology for Java virtual machine on the System i platform Item marked not complete - Click to mark complete

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About this knowledge path

The Java language's main benefit is the portability of Java applications across hardware platforms and operating systems. But some applications can't be written entirely in Java: The standard Java class libraries might not support a required platform-specific feature or library; you might prefer to implement time-critical code in a lower-level, faster language, or you might want to leverage legacy code assets. The Java Native Interface (JNI) within the Java platform enables Java and "native" (non-Java) code to interoperate. Using JNI entails certain trade-offs, beyond loss of application portability. This knowledge path is designed to help all Java™ developers use JNI safely and efficiently.

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Using the Java Native Interface

1. Learn what JNI does

2. Get started using JNI

3. Use JNI on UNIX and Linux platforms

4. Leverage JNI on IBM i

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