java.lang.UnsatisfiedLinkError: no opencv_java300 in java.library.path only while testing

Question

I am currently try to develop Java application which will use OpenCV library. I was trying to test my openCV configuration using testNg framework like this:

@Test
public void openCVTest(){
    System.out.println("OpenCV configuration simple test:");
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    Mat m = Mat.eye(3,3, CvType.CV_8UC1);
    System.out.println("OpenCV matrix = " + m.dump());
}

However that produced an error:

java.lang.UnsatisfiedLinkError: no opencv_java300 in java.library.path

I have found multiple answers(even on stackoverflow) and they all suggested bad configuration with some solutions which i tried. In the end I tried to run same code but this time in app like this:

public class App {
    public static void main( String[] args ){
        System.out.println("OpenCV configuration simple test:");
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        Mat m = Mat.eye(3,3, CvType.CV_8UC1);
        System.out.println("OpenCV matrix = " + m.dump());
    }
}

And it is working like it suposed to. So my question is, why isn't this working with testing framework? Perhaps somehow i must also configure openCV library for tests?

It appears like your top test doesn't have its java.library.path configured correctly to find it's native lib, where it is configured in correctly in your second example. Do a system.out() on the java.library.path property from your second example and see what the value is. — medloh, Oct 27 '15 at 18:28
Thanks for your interest. I am gonna try it when I return from the job. — pokemzok, Oct 28 '15 at 11:47

score 2 · Accepted Answer · answered Oct 29 '15 at 08:01

In the end I solved it using absolute path in my tests like this:

@BeforeClass
public void setUp(){
    System.loadLibrary("lib/x64/opencv_java300");
}

@Test
public void openCVTest(){
    System.out.println("OpenCV configuration simple test:");
    Mat m = Mat.eye(3,3, CvType.CV_8UC1);
    System.out.println("OpenCV matrix = " + m.dump());
}

And in my application I am loading it normally:

 public class App {

    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main( String[] args ){
        System.out.println("OpenCV configuration simple test:");
        Mat m = Mat.eye(3,3, CvType.CV_8UC1);
        System.out.println("OpenCV matrix = " + m.dump());
    }

 }

java.lang.UnsatisfiedLinkError: no opencv_java300 in java.library.path only while testing

1 Answers1