cannot run javacv example, ClassNotFoundException (Mac OS X) about javacv HOT 13 CLOSED

Hum, looks like MacPorts does not add its libraries in the path by default. We 
can work around this by setting the DYLD_FALLBACK_LIBRARY_PATH environment 
variable, e.g.:
    export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib/
This directory will be hardcoded next time I recompile JavaCV with MacPorts, 
well unless OpenCV 2.3.2 or something comes out and MacPorts takes another few 
months to follow...

Well, oddly enough now I can run the javacv example just fine in Eclipse, 
though still having some issue with the classpath on the command line.

What changed is I rebuilt libpng in Mac Ports.  I can link to the thread 
discussing it there if you wish.

[deleted comment]

I got it. Thanks anyway.

Mind sharing your solution?

Typing the export command above in a Terminal window does not work?

If you are running it in Eclipse simply add the environment variable 
DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib  in the debug/run configuration and 
that should work.  Otherwise if you run from the command line having it set in 
your env should also work.

export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib/

also worked for me.
(OSX)

Fixed in latest release!

hello we met the same problem,
My environment is : java 7, open cv 2.4.8, javacv 0.7

The problem below:

SEVERE: Servlet.service() for servlet [UploadServlet] in context with path 
[/ImgWeb] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: com.googlecode.javacv.cpp.opencv_core$CvArr
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1666)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1511)
    at com.matrix.servlet.UploadServlet.doPost(UploadServlet.java:43)
    at com.matrix.servlet.UploadServlet.doGet(UploadServlet.java:30)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:163)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:401)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)


I write a function:
public static double getSimilarity(String src, String template){
        double similarity = 0.0d;
        IplImage img, tpl, res;
        CvPoint minloc = new CvPoint();
        CvPoint maxloc = new CvPoint();
        double minval[] = new double[5];
        double maxval[] = new double[5];

        int img_width, img_height;
        int tpl_width, tpl_height;
        int res_width, res_height;

        img = cvLoadImage(src, CV_LOAD_IMAGE_COLOR);//CV_LOAD_IMAGE_COLOR
        tpl = cvLoadImage(template, CV_LOAD_IMAGE_COLOR);//CV_LOAD_IMAGE_COLOR

        img_width = img.width();
        img_height = img.height();
        tpl_width = tpl.width();
        tpl_height = tpl.height();

        if (img_height < tpl_height || img_width < tpl_width) {

            System.out.println("inter");
            IplImage tempImg = img.clone();
            img = tpl.clone();
            tpl = tempImg.clone();
            cvReleaseImage(tempImg);

            res_width = tpl_width-img_width +1;
            res_height = tpl_height - img_height +1;

            System.out.println("res_width: " + res_width + "res_height: " + res_height);

        } else {
            res_width = img_width - tpl_width + 1;
            res_height = img_height - tpl_height + 1;

        }

        System.out.println("res_width: " + res_width + "res_height: " + res_height);

        res = cvCreateImage(cvSize(res_width, res_height), IPL_DEPTH_32F, 1);
        cvMatchTemplate(img, tpl, res, CV_TM_CCORR_NORMED );
        cvMinMaxLoc(res, minval, maxval, minloc, maxloc, null);

        System.out.println("min: " + minval[0]);

        CvPoint pt1;
        CvPoint pt2;
        CvRect rect;
        rect = cvRect(maxloc.x(), maxloc.y(), tpl.width(), tpl.height());// 最佳的匹配区域
        pt1 = cvPoint(rect.x(), rect.y());
        pt2 = cvPoint(rect.x() + rect.width(), rect.y() + rect.height());
        cvRectangle(img, pt1, pt2, cvScalar(0, 0, 0, 0), 1, 8, 0);

        cvNamedWindow("reference", CV_WINDOW_AUTOSIZE);
        cvShowImage("reference", img);

        cvWaitKey(0);

        similarity = maxval[0];

        /* free memory*/
        cvReleaseImage(img);
        cvReleaseImage(tpl);
        cvReleaseImage(res);

        return similarity;
    }
when I run it in the main function there is no problem, but when I invok the 
function 
in at servlet or rest service there cause a class not found exception, How can 
I solve the problem

hello we met the same problem,
My environment is : java 7, open cv 2.4.8, javacv 0.7

The problem below:

SEVERE: Servlet.service() for servlet [UploadServlet] in context with path 
[/ImgWeb] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: com.googlecode.javacv.cpp.opencv_core$CvArr
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1666)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1511)
    at com.matrix.servlet.UploadServlet.doPost(UploadServlet.java:43)
    at com.matrix.servlet.UploadServlet.doGet(UploadServlet.java:30)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:163)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:401)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)


I write a function:
public static double getSimilarity(String src, String template){
        double similarity = 0.0d;
        IplImage img, tpl, res;
        CvPoint minloc = new CvPoint();
        CvPoint maxloc = new CvPoint();
        double minval[] = new double[5];
        double maxval[] = new double[5];

        int img_width, img_height;
        int tpl_width, tpl_height;
        int res_width, res_height;

        img = cvLoadImage(src, CV_LOAD_IMAGE_COLOR);//CV_LOAD_IMAGE_COLOR
        tpl = cvLoadImage(template, CV_LOAD_IMAGE_COLOR);//CV_LOAD_IMAGE_COLOR

        img_width = img.width();
        img_height = img.height();
        tpl_width = tpl.width();
        tpl_height = tpl.height();

        if (img_height < tpl_height || img_width < tpl_width) {

            System.out.println("inter");
            IplImage tempImg = img.clone();
            img = tpl.clone();
            tpl = tempImg.clone();
            cvReleaseImage(tempImg);

            res_width = tpl_width-img_width +1;
            res_height = tpl_height - img_height +1;

            System.out.println("res_width: " + res_width + "res_height: " + res_height);

        } else {
            res_width = img_width - tpl_width + 1;
            res_height = img_height - tpl_height + 1;

        }

        System.out.println("res_width: " + res_width + "res_height: " + res_height);

        res = cvCreateImage(cvSize(res_width, res_height), IPL_DEPTH_32F, 1);
        cvMatchTemplate(img, tpl, res, CV_TM_CCORR_NORMED );
        cvMinMaxLoc(res, minval, maxval, minloc, maxloc, null);

        System.out.println("min: " + minval[0]);

        CvPoint pt1;
        CvPoint pt2;
        CvRect rect;
        rect = cvRect(maxloc.x(), maxloc.y(), tpl.width(), tpl.height());// 最佳的匹配区域
        pt1 = cvPoint(rect.x(), rect.y());
        pt2 = cvPoint(rect.x() + rect.width(), rect.y() + rect.height());
        cvRectangle(img, pt1, pt2, cvScalar(0, 0, 0, 0), 1, 8, 0);

        cvNamedWindow("reference", CV_WINDOW_AUTOSIZE);
        cvShowImage("reference", img);

        cvWaitKey(0);

        similarity = maxval[0];

        /* free memory*/
        cvReleaseImage(img);
        cvReleaseImage(tpl);
        cvReleaseImage(res);

        return similarity;
    }
when I run it in the main function there is no problem, but when I invok the 
function 
in at servlet or rest service there cause a class not found exception, How can 
I solve the problem.

hey  [email protected]

I am having the same situation with struts2, with main it runs fine but when 
itegrating with struts2 it gives the exception....hoping someone will give us 
the solution..quickly.

We usually need to do something special for JNI and containers like Struts. 
Please read their documentation and follow what they say we should do in the 
case of JNI.