Can't figure out how to set java.library.path

Question

I've looked at several other similar questions here, but none of them have been helping. I am able to run my program in eclipse, but once I try to export it as a jar, it can't find the opencv library:

C:\Users\Cory\Desktop>java -jar MazeBot.jar
Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java249 in
java.library.path
    at java.lang.ClassLoader.loadLibrary(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at MazeBot.main(MazeBot.java:38)

By looking at the responses for other questions, I tried setting my PATH variable to C:\\OpenCV (I put a copy of opencv_java249.dll in there), which didn't work at all. Then, I tried adding System.setProperty("java.library.path", "C:\\\\OpenCV") as the first line of my code, but this also did nothing.

I'm not sure what I'm doing wrong...

Answer 1

Try using: java -jar MazeBot.jar -Ljava.library.path="C:\\\\OpenCV"

This has cannot be in the application itself because you are importing OpenCV before the System.setProperty(...) line gets executed.