Error "Failed to get field handle to set library path" when using Java 12 about opencv HOT 7 CLOSED

I have some changes in the works that will hopefully solve this problem permanently. I am looking at changing how the library is loaded to the same method that JNA uses, and this should remain compatible across JDK updates.

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Hi @martinschneider, no, this isn't a known problem. This library tends to be a little bit fragile when it comes to new Java versions, so there is probably some tweaks that need to be made. If you are able to come up with a compatible fix that would be very welcome! Otherwise, I will look at this as soon as I have some time.

Thanks,
Jason

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The same error for me. When I'm testing with OpenJDK 10 it is loading but I get the following warning:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by nu.pattern.OpenCV$SharedLoader (file:/home/maurice/.gradle/caches/modules-2/files-2.1/org.openpnp/opencv/3.4.2-1/fbd8f36fd1ce4e2bf0dcb12befd7d4cfc74d8d35/opencv-3.4.2-1.jar) to field java.lang.ClassLoader.usr_paths
WARNING: Please consider reporting this to the maintainers of nu.pattern.OpenCV$SharedLoader
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
OpenJDK 64-Bit Server VM warning: You have loaded library /tmp/opencv_openpnp2599240055310010051/nu/pattern/opencv/linux/x86_64/libopencv_java342.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

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Instead of OpenCV.loadShared(); you can use OpenCV.loadLocally(); if it's appropriate for your project. In JDK10+ they restricted the reflective access so it won't work anymore.

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I get the same error on Java 11.0.3. Problem is I need to use Java 11, so any ideas on how to fix this?

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Thanks a lot for fixing this!

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