使用webcam-capture Java库时遇WebcamException错误求助

你的核心错误是java.lang.UnsatisfiedLinkError，这说明webcam-capture依赖的原生本地库没有正确加载，下面是具体解决步骤：

1. 升级webcam-capture版本 #

你使用的0.3.12版本过于老旧，存在大量兼容性问题，尤其是对高版本Java的支持不足。建议直接升级到最新稳定版，修改pom.xml配置：

<dependency>
    <groupId>com.github.sarxos</groupId>
    <artifactId>webcam-capture</artifactId>
    <version>0.3.16</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.36</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.7.36</version>
</dependency>

2. 检查Java版本兼容性 #

0.3.12版本仅支持Java 8及以下版本，如果你的项目运行在Java 11+环境，升级库版本是必须的——新版本已修复高版本Java的兼容性问题。若必须使用老版本，需切换到Java 8运行项目。

3. 配置摄像头权限 #

• Windows：打开系统设置-隐私和安全性-摄像头，确保当前程序被允许访问摄像头。
• macOS：进入系统偏好设置-安全性与隐私-隐私-摄像头，勾选你的IDE或运行程序。
• Linux：将当前用户加入video组，执行命令后重新登录生效：

sudo usermod -aG video $USER

4. 尝试更换摄像头驱动 #

如果升级库后仍有问题，可以强制指定其他驱动，比如Linux环境下的V4L驱动：

Webcam.setDriver(new WebcamV4lDriver());
Webcam webcam = Webcam.getDefault();
webcam.open();
ImageIO.write(webcam.getImage(), "PNG", new File("file_path"));

问题详情 #

尝试使用webcam-capture Java库，但始终出现WebcamException错误。

pom.xml配置

<dependency>
    <groupId>com.github.sarxos</groupId>
    <artifactId>webcam-capture</artifactId>
    <version>0.3.12</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.36</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.7.36</version>
</dependency>

运行代码

Webcam webcam = Webcam.getDefault();
webcam.open();
ImageIO.write(webcam.getImage(), "PNG", new File("file_path"));

报错信息

[main] INFO com.github.sarxos.webcam.Webcam - WebcamDefaultDriver capture driver will be used
Exception in thread "main" com.github.sarxos.webcam.WebcamException: java.util.concurrent.ExecutionException: com.github.sarxos.webcam.WebcamException: Cannot execute task
    at com.github.sarxos.webcam.WebcamDiscoveryService.getWebcams(WebcamDiscoveryService.java:124)
    at com.github.sarxos.webcam.Webcam.getWebcams(Webcam.java:893)
    at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:956)
    at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:933)
    at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:911)
    at com.datacollection.Main.main(Main.java:47)
Caused by: java.util.concurrent.ExecutionException: com.github.sarxos.webcam.WebcamException: Cannot execute task
    at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
    at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
    at com.github.sarxos.webcam.WebcamDiscoveryService.getWebcams(WebcamDiscoveryService.java:116)
    ... 5 more
Caused by: com.github.sarxos.webcam.WebcamException: Cannot execute task
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.process(WebcamProcessor.java:72)
    at com.github.sarxos.webcam.WebcamProcessor.process(WebcamProcessor.java:140)
    at com.github.sarxos.webcam.WebcamTask.process(WebcamTask.java:46)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver$GetDevicesTask.getDevices(WebcamDefaultDriver.java:79)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver.getDevices(WebcamDefaultDriver.java:124)
    at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:36)
    at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:26)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.UnsatisfiedLinkError: com.github.sarxos.webcam.ds.buildin.natives.OpenIMAJGrabber.getVideoDevices()Lorg/bridj/Pointer;
    at com.github.sarxos.webcam.ds.buildin.natives.OpenIMAJGrabber.getVideoDevices(Native Method)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver$GetDevicesTask.handle(WebcamDefaultDriver.java:93)
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.run(WebcamProcessor.java:81)
    ... 3 more

Process finished with exit code 1

内容的提问来源于stack exchange，提问作者fallingriptide