Lab 3 - Exception in Application start method?

Question

We're getting this error:
Exception in Application start method
java.lang.reflect.InvocationTargetException
(at ...)
Caused by: java.lang.RuntimeException: Exception in Application start method
(at...)
Caused by: java.lang.UnsatisfiedLinkError: org.opencv.videoio.VideoCapture.VideoCapture_3()J
(at...)
at application.Main.start(Main.java:14)
(at...)
Exception running application application.Main

It happens when we press the run button on the main class. So we can't even get the gui to run because Main.java: 14 is literally the first line in the try block.

Answer 1

I'm wondering whether you have added the line System.loadLibrary(Core.NATIVE_LIBRARY_NAME); in the main method or not since it was one of the reasons why our very first example of openCV (the one that we did in class last week trying to load an image) didn't work.

Also, take a look at your "import" code because I think what should be included in Main.java, for example, is import org.opencv.core.Core; instead of org.opencv.videoio.VideoCapture.VideoCapture_3() like your error above...

Comments

We tried moving it and a couple of other things (like initializing the VideoCapture in the data field section) and it somehow worked.

Thanks!

Answer 2

Did you encounter this problem before during lab 3?
I've never encountered it but you may try to copy the original codes from gitHub and see if it still has the same problem...

Comments

No we hadn't gotten it before. Stonedahl ended up helping us and it probably came from what Tiffany said. Thanks though