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Distribute Opencv java project?

asked 2016-01-06 11:35:33 -0500

updated 2016-01-13 14:25:01 -0500

Forgive the newbie question - Eclipse 3.8 Ubuntu 14.04 - java project runs under Eclipse a-ok. I would like to export to production and distribute .jar to other linux users. However, what I am reading so far indicates the users must install Opencv on their own systems before they can use my program. Is that correct? If not - what steps can I take to make this as painless as possible on the users who are unlikely to be very computer literate.

* please see my update below and post assistance if you can

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answered 2016-01-07 01:39:35 -0500

RolandC gravatar image

You need to distribute only the jar file and the libraries for the given operating system. There's no need for the users to have OpenCV "installed".

A possibility would be that you distribute a compressed / extractable package (tar, zip, jar, etc) with all the classes and libraries, including a shell command to start the application.

You can read about how to start the application here.

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I was able to run the .jar file successfully on the machine where opencv is installed using the -Djava.library.path="/my/path" command linking the opencv_java310.so to the .jar.

However, when I run on a different machine where opencv is not installed I have encounted: "java.lang.unstatisfiedlinkerror: libopencv_java310.so: libopencv_core.so.3.1 cannot open shared object file.: No such file or directory" I have brought over the opencv_core.so.3.1.0 file over and built a link file libopencv_core.so.3.1 that it references the libopencv_ core.so.3.1.0 but no success. Same error.

Softwar gravatar imageSoftwar ( 2016-01-10 18:30:10 -0500 )edit
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answered 2016-01-13 09:15:54 -0500

updated 2016-01-16 18:37:47 -0500

The answer is the Opencv libraries need to be stored on the installation machine in exactly the same directories as the production machine. In my case, I may have not used the right directories during my initial installation on the production machine - storing the opencv libraries in my workspace.

First, I created the same directories on the installation PC /home/me/OpenCV/opencv-3.1.0/build/lib and copied all the opencv libraries from the production machine into that directory.

Second, I used ldd /home/me/opencv_java310.so to find the libraries with missing links.

Third, I used ln -s library.file library.link name to create each link as named in the ldd output.

Fourth, I had to copy over and create links for some libraries stored in the system area /usr/lib and /usr/lib/x86_64-linux-gnu that were also highlighted as missing in the ldd output from opencv_java310.so

Finally, I was able to execute the program java -Djava.library.path="/home/me/OpenCv/opencv-3.1.0/build/lib" -jar program.jar

My next step will be to automate this process with either a shell or some other utility and zip files to contain all the data. I suspect that I should carry ALL the library files from the ldd opencv_java310.so output and create the links just in case the installation machine does not have any of them.

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Asked: 2016-01-06 11:35:33 -0500

Seen: 803 times

Last updated: Jan 16 '16