NO opencv_java300 in java.library.path [duplicate]

问题

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.

回答1:

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");

回答2:

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" ....

回答3:

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

回答4:

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.

回答5:

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>

来源：https://stackoverflow.com/questions/31286453/no-opencv-java300-in-java-library-path

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java

OpenCV

jar