How to Package Native and JNI Libraries Within a JAR?

Packaging Native and JNI Libraries Within a JAR

Bundling native and JNI libraries into a single JAR allows for seamless redistribution. Below is a practical solution to achieve this:

Procedure:

1. Create Native Library Bundle:

   • Include all native JNI libraries within the JAR at a platform-specific location, such as NATIVE/${os.arch}/${os.name}/libname.lib.

2. Initialize Library Loading:

   • In a static initializer of the main class:

     • Determine os.arch and os.name.
     • Search for the library in the JAR using Class.getResource(String).
     • If found, extract it to a temporary file.
     • Load the library using System.load(File).

Example Code:

The jzmq code provides an implementation of this solution. It includes a hybrid approach to load embedded libraries if possible, but falls back to searching the system path if necessary. Refer to this code for a practical example.

Considerations:

• Portability may be affected, as not all platforms may be supported by the included libraries.
• While simplified redistribution, this approach may introduce additional initialization overhead compared to traditional system path searching.

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