odules:ty:compileJavaWARNING

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modules:ty:compileJava WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by worker.org.gradle.internal.reflect.JavaMethod (file:/Users/---/.gradle/caches/3.0/workerMain/gradle-worker.jar) to method java.lang.ClassLoader.getPackages() WARNING: Please consider reporting this to the maintainers of worker.org.gradle.internal.reflect.JavaMethod WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release
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CascadeClassifier faceDetector

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OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale, file C:\builds\master_PackSlaveAddon-win32-vc12-static\opencv\modules\objdetect\src\cascadedetect.cpp, line 1634
Exception in thread "main" CvException [org.opencv.core.CvException: cv::Exception: C:\builds\master_PackSlaveAddon-win32-vc12-static\opencv\modules\objdetect\src\cascadedetect.cpp:1634: error: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale
]
at org.opencv.objdetect.CascadeClassifier.detectMultiScale_1(Native Method)
at org.opencv.objdetect.CascadeClassifier.detectMultiScale(CascadeClassifier.java:103)


solution :

make sure that you do this following steps :
- path absolute
- test if empty

 CascadeClassifier faceDetector = new CascadeClassifier("C:/opencv/sources/data/haarcascades/haarcascade_frontalface_alt.xml");
     
        Mat image = Imgcodecs.imread("D:/network/opencv/lena2.png");
     
    if (faceDetector.empty()){
    System.out.println("faceless");
    }
    if(image.empty()){
    System.out.println("imageless");
    }

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