bytedeco/javacv

Cannot open local webcam on NetBeans JavaFX 8 Project

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#1,618 opened on Apr 3, 2021

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Description

I use new version 1.5.5 with example code JavaFxPlayVideo.java on JavaFX 8

For grabbing local webcam I use FrameGrabber grabber = new OpenCVFrameGrabber(1); because FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(1); is no more possible (yes 1 is correct).

In normal Java-Project I can run this example, but when I create it with NetBeans as a JavaFX project, I get an exception:

Exception in thread "Thread-5" java.lang.ExceptionInInitializerError at org.bytedeco.javacv.OpenCVFrameGrabber.(OpenCVFrameGrabber.java:95) at camtest.JavaFxPlayVideo.lambda$start$1(JavaFxPlayVideo.java:55) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724) at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531) at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355) at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286) at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120) at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72) at java.lang.Class.createAnnotationData(Class.java:3521) at java.lang.Class.annotationData(Class.java:3510) at java.lang.Class.createAnnotationData(Class.java:3526) at java.lang.Class.annotationData(Class.java:3510) at java.lang.Class.createAnnotationData(Class.java:3526) at java.lang.Class.annotationData(Class.java:3510) at java.lang.Class.getAnnotation(Class.java:3415) at java.lang.reflect.AnnotatedElement.isAnnotationPresent(AnnotatedElement.java:258) at java.lang.Class.isAnnotationPresent(Class.java:3425) at org.bytedeco.javacpp.Loader.checkPlatform(Loader.java:994) at org.bytedeco.javacpp.Loader.load(Loader.java:1171) at org.bytedeco.javacpp.Loader.load(Loader.java:1148) at org.bytedeco.javacv.OpenCVFrameConverter.(OpenCVFrameConverter.java:43) ... 3 more

Contributor guide

Research direction
Inspect the NetBeans classpath and ensure all required javacv, javacpp, and native library dependencies are correctly added. Verify that the JavaFX project structure includes the necessary jars and that the OpenCV native libraries are loaded properly.
Tech stack
java
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
JavaNetBeansMaven/Gradle basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50