OpenCV dll loading order seems wrong, resulting in UnsatisifedLinkError

[dkgof]

When loading the dll files for opencv the loader tries to load:

concrt140.dll
msvcp140.dll
vcruntime140.dll

before all the api-ms-win dlls, which does not work, as the former 3 depend on the later.

This results in UnsatisfiedLinkError when loading the first 3 dlls, and then later when trying to load the opencv dlls, because the former failed.

Manually installing vc runtime 2015 fixes this, but kinda defeats the purpose of having the dll's included in the first place.

Test app just tries to do the following to load the lib:

opencv_core.Point2d point = new opencv_core.Point2d(0, 0);
System.out.println(""+point);

From console:

Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\concrt140.dll
Failed to load C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\concrt140.dll: java.lang.UnsatisfiedLinkError: C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\concrt140.dll: Can't find dependent libraries
Loading library concrt140
Failed to load for concrt140: java.lang.UnsatisfiedLinkError: C:\Program Files\Java\jre1.8.0_181\bin\concrt140.dll: Can't find dependent libraries
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\msvcp140.dll
Failed to load C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\msvcp140.dll: java.lang.UnsatisfiedLinkError: C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\msvcp140.dll: Can't find dependent libraries
Loading library msvcp140
Failed to load for msvcp140: java.lang.UnsatisfiedLinkError: C:\Program Files\Java\jre1.8.0_181\bin\msvcp140.dll: Can't find dependent libraries
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\vcruntime140.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-locale-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-string-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-stdio-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-math-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-heap-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-runtime-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-convert-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-environment-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-time-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-filesystem-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-utility-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\api-ms-win-crt-multibyte-l1-1-0.dll
Loading C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\opencv_core342.dll
Failed to load C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\opencv_core342.dll: java.lang.UnsatisfiedLinkError: C:\Users\rolf\.javacpp\cache\opencv-3.4.2-1.4.2-windows-x86_64.jar\org\bytedeco\javacpp\windows-x86_64\opencv_core342.dll: Can't find dependent libraries
Loading library opencv_core342
Failed to load for opencv_core342: java.lang.UnsatisfiedLinkError: no opencv_core342 in java.library.path

[dkgof]

From further inspection it seems vcruntime140.dll does not require the api-ms dlls, and loads correctly, so its only the other 2 that needs to be loaded after.

[dkgof]

Looking through the source code inside javacpp-presets/opencv/src/main/java/org/bytedeco/javacpp/presets/opencv_core.java:

@Platform(value = "windows", define = "_WIN32_WINNT 0x0502", link =  {"opencv_core342", "opencv_imgproc342"}, preload = {"concrt140", "msvcp140", "vcruntime140",
        "api-ms-win-crt-locale-l1-1-0", "api-ms-win-crt-string-l1-1-0", "api-ms-win-crt-stdio-l1-1-0", "api-ms-win-crt-math-l1-1-0",
        "api-ms-win-crt-heap-l1-1-0", "api-ms-win-crt-runtime-l1-1-0", "api-ms-win-crt-convert-l1-1-0", "api-ms-win-crt-environment-l1-1-0",
        "api-ms-win-crt-time-l1-1-0", "api-ms-win-crt-filesystem-l1-1-0", "api-ms-win-crt-utility-l1-1-0", "api-ms-win-crt-multibyte-l1-1-0", "opencv_cudev342"})

Should probabely be changed to:

@Platform(value = "windows", define = "_WIN32_WINNT 0x0502", link =  {"opencv_core342", "opencv_imgproc342"}, preload = {
        "api-ms-win-crt-locale-l1-1-0", "api-ms-win-crt-string-l1-1-0", "api-ms-win-crt-stdio-l1-1-0", "api-ms-win-crt-math-l1-1-0",
        "api-ms-win-crt-heap-l1-1-0", "api-ms-win-crt-runtime-l1-1-0", "api-ms-win-crt-convert-l1-1-0", "api-ms-win-crt-environment-l1-1-0",
        "api-ms-win-crt-time-l1-1-0", "api-ms-win-crt-filesystem-l1-1-0", "api-ms-win-crt-utility-l1-1-0", "api-ms-win-crt-multibyte-l1-1-0", "concrt140", "msvcp140", "vcruntime140", "opencv_cudev342"})

Moving the problem dlls to the end of the preload list, instead of at the beginning.

[saudet]

Should be fixed now, please try it with the snapshots:
http://bytedeco.org/builds/
Thanks for reporting!

[dkgof]

Latest snapshot, fixes this problem :)

Thanks for the quick response!

[saudet]

Fix included in version 1.4.3! Thanks again for reporting.