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no opencv_java244 in java.library.path

asked 2013-02-23 04:52:04 -0500

goodspeed gravatar image

Hi i try use OpenCV like in "introduction in java development", but i dont know what i must edit in image description. When i change my folder with extracted OpenCV, Eclipse write no opencv_java244 in java.library.path. What i do wrong?

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Same problem here..i done everything the vm options in my netbeans project then i get a new error saying : cant find dependent libraries..can anyone help me..Thanks

Salamatah gravatar imageSalamatah ( 2018-02-28 04:26:05 -0500 )edit

Don't post a question as an answer. Don't hope any answer : this post is too old. Post your question as a new one. gives opencv version and platform and full error message

LBerger gravatar imageLBerger ( 2018-02-28 04:29:31 -0500 )edit

"cant find dependent libraries" -- make sure, your opencv dlls are on the PATH env var

berak gravatar imageberak ( 2018-02-28 04:30:23 -0500 )edit

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answered 2013-02-23 13:20:16 -0500

Dangthrimble gravatar image

After much trial and error(!), assuming OpenCV is installed on a Windows machine at <opencv-dir>:

  • The JAR is in <opencv-dir>\build\java.
  • On a 32-bit Windows machine, the Native Library Location is <opencv-dir>\build\java\x86.
  • On a 64-bit Windows machine, the Native Library Location is <opencv-dir>\build\java\x64.

Therefore, on my 64-bit Windows 7 PC with OpenCV installed at D:\opencv:

  • The JAR is in D:\opencv\build\java.
  • The Native Library Location is D:\opencv\build\java\x64.
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it works for me with native library located in D:\opencv\build\java\x32. Thanks!

goodspeed gravatar imagegoodspeed ( 2013-02-24 05:32:11 -0500 )edit

thanks a lot! :D

sharpsh007er gravatar imagesharpsh007er ( 2013-03-12 06:21:24 -0500 )edit

Thanks. This works !!!

Tharindu Rusira gravatar imageTharindu Rusira ( 2013-06-12 10:43:12 -0500 )edit
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answered 2014-02-02 03:24:48 -0500

Flynn gravatar image

updated 2014-02-02 03:30:28 -0500

Answer for mac users:

It seems no one has posted the location of the OpenCV Java native directory/files for mac users!

After a great deal of searching, I finally found it:

On Mac OSX Mavericks, having done a Cmake build of 2.4.8, I found that setting the "Native Library Location" to the directory "build/lib" did the trick!

It seems that "build/lib" contains a file named "libopencv_java248.dylib", which is apparently exactly what the Mac version of OpenCV wants as its native file!

As an example, for my project, the full location was:

/Users/Flynn/Documents/Eclipse Main Workspace/_Libraries/opencv-2.4.8/build/lib

Where "opencv-2.4.8" was the copy of 2.4.8 that I downloaded, and where "/build" is the build folder that I was instructed to make by this tutorial.

Hope this helps any fellow mac users!

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I have been dealing with this same issue. I pointed my Native Library to the build/lib folder, but I still am getting compile time errors:

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

NATIVE_LIBRARY_NAME cannot be resolved or is not a field

kommi10 gravatar imagekommi10 ( 2014-03-23 23:46:10 -0500 )edit
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answered 2013-02-23 06:09:05 -0500

Java API is only wrapper for native C++ library. Your java machine must find it in run time. Specify path to the native OpenCV libraries in project settings: select project, right click->properties, "java build path", "libraries" tab, select the OpenCV jar, expand it, select "Native library location", click "edit...", folder chooser dialog will appear.

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So, for a 64-bit Windows machine, that would be ...\opencv\build\x64\mingw\bin or ...\opencv\build\x64\mingw\lib?

Dangthrimble gravatar imageDangthrimble ( 2013-02-23 11:51:09 -0500 )edit

Have tried D:\opencv\build\x64\mingw\bin, D:\opencv\build\x64\mingw\lib and D:\opencv\build\x64\mingw and I still get the same "no opencv_java244 in java.library.path" error as goodspeed. A bit more information would be a real help. What identifies the native library's location?

Dangthrimble gravatar imageDangthrimble ( 2013-02-23 12:21:29 -0500 )edit

D:\opencv\build\java\x64

Andrey Pavlenko gravatar imageAndrey Pavlenko ( 2013-02-25 02:52:34 -0500 )edit
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Asked: 2013-02-23 04:52:04 -0500

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Last updated: Feb 28 '18