How Can I Package DLL Dependencies with My Java Code into a Single JAR File?

Packaging JAR Files with DLL Dependencies

The task at hand involves creating a single JAR file that contains your code, third-party JAR files, and their accompanying DLL dependencies. This question has garnered attention, particularly with the SWT library as an example.

The solution lies in packaging everything together within the JAR file. However, an important caveat exists: before utilizing the DLLs, you must extract them from the JAR and store them on the hard disk. Failure to do so will prevent you from accessing them.

To clarify further, when packaging DLLs or other files into a JAR, the process is analogous to creating a ZIP archive. Simply include the necessary files within the JAR structure.

As an illustration, consider the following Java code snippet:

// ...
static {
    logger.info("Loading DLL");
    try {
        System.loadLibrary(ACWRAPPER);
        logger.info("DLL is loaded from memory");
    } catch (UnsatisfiedLinkError e) {
        loadFromJar();
    }
}

private static void loadFromJar() {
    // we need to put both DLLs to temp dir
    String path = "AC_" + new Date().getTime();
    loadLib(path, ACWRAPPER);
    loadLib(path, AAMAPI);
    loadLib(path, LIBEAU);
}

private static void loadLib(String path, String name) {
    // ...
}
// ...

This code demonstrates the extraction of DLLs from a JAR, placement in a temporary directory, and subsequent loading into memory. By understanding this process, you can effectively create JAR files that encompass all the necessary components, including DLL dependencies.

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