我已经开始学习OpenCV Java，并且这是我编写的用于测试OpenCV设置的程序：
```java
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class FirstProgram 
{
    public static void main(String args[]) 
    {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        Mat mat = Mat.eye(3, 3, CvType.CV_8UC1);
        System.out.println(mat.dump());
    }
}

<details>
<summary>英文:</summary>
I have started learning OpenCV Java and this is the program I have written to test the OpenCV setup:

But on running this, Eclipse shows the error: 
"*Error: Could not find or load main class FirstProgram
Caused by: java.lang.ClassNotFoundException: FirstProgram*"
I have already setup the [user libraries][1] and added the libraries to the [project folder][2]. (Screenshots linked)
How do I resolve this issue ?
- OpenCV version: 4.2.0 
- Eclipse: 2019-03 
- JDK: 13
  [1]: https://i.stack.imgur.com/TiwYu.jpg
  [2]: https://i.stack.imgur.com/kHTdg.jpg
</details>
# 答案1
**得分**: 1
Eclipse 2019-03（发布于2019年3月）对于Java 13（发布于2019年9月）来说过于陈旧。
请[升级][1]至当前版本（目前为Eclipse 2020-03）。
[1]: https://stackoverflow.com/a/46273081/6505250
<details>
<summary>英文:</summary>
Eclipse 2019-03 (released March 2019) is too old for Java 13 (released September 2019).
Please [upgrade][1] to the current version (currently, Eclipse 2020-03).
  [1]: https://stackoverflow.com/a/46273081/6505250
</details>