Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: java.lang.ClassNotFoundException: com.mysql.cj.jdbc.driver

以下是处理异常的示例代码：

public class BUtil {
    private static final String DRIVER = "com.mysql.jdbc.Driver";
    private static final String URL = "jdbc:mysql://localhost:3306/library_db?useUnicode=true&characterEncoding=UTF-8";
    private static final String USER = "root";
    private static final String PWD = "666918";

    static {
        try {
            Class.forName(DRIVER);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("java.lang.ClassNotFoundException: " + e.getMessage());
        }
    }
}