How to package opencv +java in a jar

Question

I\'ve been using Opencv 2.4.5 with Java for a while building an application and would now like to distribute the app. The library is loaded using the following:

Answer 1

As Steven C said, it was as in Extract and load DLL from JAR and also in a bug report. I was slightly ignorant of how to use dylibs and was trying to be consistent with an OpenCV tutorial which used a "user library" to add a jar, and then add the native dylib. Also, for some reason loading resources even when using "/" was loading from the src directory, not my project's root directory (which was the case in a test project I made).

For those trying to do the same thing, here's some code to help:

private static void loadLibrary() {
    try {
        InputStream in = null;
        File fileOut = null;
        String osName = System.getProperty("os.name");
        Utils.out.println(Main.class, osName);
        if(osName.startsWith("Windows")){
            int bitness = Integer.parseInt(System.getProperty("sun.arch.data.model"));
            if(bitness == 32){
                Utils.out.println(Main.class, "32 bit detected");
                in = Main.class.getResourceAsStream("/opencv/x86/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
            else if (bitness == 64){
                Utils.out.println(Main.class, "64 bit detected");
                in = Main.class.getResourceAsStream("/opencv/x64/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
            else{
                Utils.out.println(Main.class, "Unknown bit detected - trying with 32 bit");
                in = Main.class.getResourceAsStream("/opencv/x86/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
        }
        else if(osName.equals("Mac OS X")){
            in = Main.class.getResourceAsStream("/opencv/mac/libopencv_java245.dylib");
            fileOut = File.createTempFile("lib", ".dylib");
        }


        OutputStream out = FileUtils.openOutputStream(fileOut);
        IOUtils.copy(in, out);
        in.close();
        out.close();
        System.load(fileOut.toString());
    } catch (Exception e) {
        throw new RuntimeException("Failed to load opencv native library", e);
    }