UnsatisfiedLinkError

[rosenjcb]

I get this error when running my OpenCV project:

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /tmp/opencv_openpnp6038665475955000750/nu/pattern/opencv/linux/x86_64/libopencv_java320.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'.
Exception in thread "main" java.lang.UnsatisfiedLinkError: /tmp/opencv_openpnp6038665475955000750/nu/pattern/opencv/linux/x86_64/libopencv_java320.so: /tmp/opencv_openpnp6038665475955000750/nu/pattern/opencv/linux/x86_64/libopencv_java320.so: cannot enable executable stack as shared object requires: Invalid argument
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
        at java.lang.Runtime.loadLibrary0(Runtime.java:870)
        at java.lang.System.loadLibrary(System.java:1122)
        at nu.pattern.OpenCV$SharedLoader.<init>(OpenCV.java:204)
        at nu.pattern.OpenCV$SharedLoader.<init>(OpenCV.java:185)
        at nu.pattern.OpenCV$SharedLoader$Holder.<clinit>(OpenCV.java:225)
        at nu.pattern.OpenCV$SharedLoader.getInstance(OpenCV.java:229)
        at nu.pattern.OpenCV.loadShared(OpenCV.java:179)
        at com.pdfextract.common.App.<clinit>(App.java:14)

I also have this at the top of my App.java (main class):

static { 
	nu.pattern.OpenCV.loadShared();
	System.loadLibrary(org.opencv.core.Core.NATIVE_LIBRARY_NAME);
}	

I have not downloaded and installed opencv, but I am under the impression that this should work without having to manually install and link the lib. What should I do?

[rosenjcb]

This seems to be an WSL issue. I might close this post unless someone else has other input to give.

[vonnieda]

This is likely a duplicate of #38. Try using version 2.4.11-2 and see if it works. That version is known to be stable on all platforms.

[rosenjcb]

@vonnieda Imagecodecs is not a usable import if I use version 2.4.11-2

[vonnieda]

This is now fixed as part of #33.