NO opencv_java300 in java.library.path [duplicate]

Question

Thanks in advance..

I have a project that uses opencv-300.jar as external library. I have tried this in eclipse and in natBeans. In both it is working successfully when I am running my project from IDE itself. I want my project to export it as a runnable (or executable) jar. I placed my opencv_java300.dll file in source folder with main java file and given its name in

 System.loadLibrary("opencv_java300");

I placed opencv-300.jar in external jar libraries and all other files which are needed in Main program. it is working successfully when running from IDE but when I am creating executable jar, it shows an error

   Exception in thread "main" java.lang.UnsatisfiedLinkError: no     
   opencv_java300 in
   java.library.path
   at java.lang.ClassLoader.loadLibrary(Unknown Source)
   at java.lang.Runtime.loadLibrary0(Unknown Source)
   at java.lang.System.loadLibrary(Unknown Source)
   at CropFaceImage.main(CropFaceImage.java:27)

Please tell me Is there any way to give java.library.path in program itself. My project is working sucsessfully even when I have removed path for opencv_java300.dll file in external library.

In my case I used github.com/openpnp/opencv and had to put nu.pattern.OpenCV.loadShared(); at the beginning of my code to use the native libraries and avoid this error message. — asmaier
– asmaier, Commented Jan 12, 2018 at 13:44

Anuj · Accepted Answer · 2015-07-15 13:20:45Z

12

I tried to pass the command which contains path for opencv but I found no other way. Somehow i tried something which created my jar and it is properly running. I copied the opencv_java300.dll file and put it in the directory which is next to the my jar file and did same for all supporting files. I used following code to do so.

String opencvpath = System.getProperty("user.dir") + "\\files\\";
String libPath = System.getProperty("java.library.path");
System.load(opencvpath + Core.NATIVE_LIBRARY_NAME + ".dll");

answered Jul 15, 2015 at 13:20

Anuj

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1 Comment

Ahmed Gad Over a year ago

This was not working correctly for me. I used load() rather than loadLibrary() and prepended the Core.NATIVE_LIBRARY_NAME by the path of the DLL file. Finally, the .dll extension is added at the end to form the absolute path of the DLL file. The line I used is "System.load("D:\\OpenCV\\opencv-3.0.0\\opencv\\build\\java\\x64\\"+Core.NATIVE_LIBRARY_NAME+".dll");" Remember to use x64 or x86 depending on your system. I did not copied the DLL file.

Kalyan Chavali · Accepted Answer · 2015-07-08 07:48:16Z

5

You can use a command line argument as below and call your class which has the main

java -Djava.library.path="Folder which contains your dll" ....

answered Jul 8, 2015 at 7:48

Kalyan Chavali

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7 Comments

Anuj Over a year ago

Does this work when creating jar file command prompt...Please tell how can i create jar file including external library ( such as other jar file..opencv-300.jar) with this command.

Kalyan Chavali Over a year ago

This works when executing your class from the prepared jar file. Whenever you are invoking the class in the jar file, you would need to pass above argument.

Anuj Over a year ago

I want to create a runnable jar file which does not take any argument ..Is there any way to give this command in program itself or when creating jar file from command prompt.

Kalyan Chavali Over a year ago

I am not sure if it is possible . You can however, write a bat file which inturn calls the runnable jar with the above argument . You can use the bat file instead of the runnable jar.

Anuj Over a year ago

It is showing an error could not find or load main class CrooppingTool2.jar

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nik_kobe · Accepted Answer · 2015-11-23 14:34:46Z

1

I had the same problem, solved it by switching the JRE System library. It seems like the problem occurs only if using jre1.8.0_65. Everything worked well by me with jre1.8.0_25, jre1.8.0.45 and jre1.8.0.66

edited Nov 23, 2015 at 14:34

answered Nov 23, 2015 at 10:08

nik_kobe

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Comments

Community · Accepted Answer · 2017-05-23 12:09:07Z

0

I solved my problem when I've configured native library in eclipse. You need choose a library reference your OS platform.

Look at here: adding openCV to java buildpath in eclipse.

edited May 23, 2017 at 12:09

CommunityBot

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answered Sep 4, 2015 at 4:52

Jackson William

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1 Comment

Ivan Ursul Over a year ago

It's not about eclipse, it's about running executable jar

AldaronLau · Accepted Answer · 2016-01-24 04:39:37Z

0

I was able to fix the error by removing my System.loadLibrary("opencv_java300"); From the code and adding the jar file to the classpath in my build.xml:

<jar destfile="program.jar" basedir="build/classes">
    <manifest>
        <attribute name="Main-Class" value="com.src.program"/>
        <attribute name="Class-path" value="opencv-300.jar"/>
    </manifest>
</jar>

answered Jan 24, 2016 at 4:39

AldaronLau

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