How to solve the error: could not find or load main class againtest.hellocv?

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Java

OpenCV

I tested the following code of opencv3.0.0 with Java eclipse neon and run and I got the error in the above question.
Pls help me!

Thanks in advance,
Kathy.

package againtest;

import org.opencv.core.*;       
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;
 

public class VideoCap {
	
	public static void main(String[] args) {
 
		System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
		
		VideoCapture camera = new VideoCapture();
		camera.open(0);
		
    	if(!camera.isOpened()){
    		System.out.println("Error");
    	} else {
    		Mat frame = new Mat();
    	    while(true){
    	    	if (camera.read(frame)){
    	    		System.out.println("Frame Obtained");
    	    		System.out.println("Captured Frame Width " + 
    	    		frame.width() + " Height " + frame.height());
    	    		Imgcodecs.imwrite("image/camera.jpg", frame);
    	    		System.out.println("OK");
    	    		break;
    	    	}
    	    }	
    	}
    	camera.release();
	}
 
}

What I have tried:

I tried to test opencv3.0.0 with java eclipse neon.