OpenCV. SpringBoot. Illegal reflective access by nu.pattern.OpenCV$SharedLoader - spring-boot

Question

I've similar problem like described here, but do not see an answer up there how to clean it. As advised added in dependencies maven-compiler-plugin and maven-war-plugin. It did not help.
my pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com</groupId>
<artifactId>opencv2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>opencv2</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.openpnp/opencv -->
<dependency>
<groupId>org.openpnp</groupId>
<artifactId>opencv</artifactId>
<version>4.5.1-2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-war-plugin -->
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
an error:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by nu.pattern.OpenCV$SharedLoader (file:/C:/Users/Roman/.m2/repository/org/openpnp/opencv/4.5.1-2/opencv-4.5.1-2.jar) to field java.lang.ClassLoader.usr_paths
WARNING: Please consider reporting this to the maintainers of nu.pattern.OpenCV$SharedLoader
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
For testing I've copied the code:
#SpringBootApplication
public class Opencv2Application {
public static void main(String[] args) {
SpringApplication.run(Opencv2Application.class, args);
nu.pattern.OpenCV.loadShared();
System.loadLibrary(org.opencv.core.Core.NATIVE_LIBRARY_NAME);
Mat mat = new Mat(4,3,1);
System.out.println(mat.dump());
}
}
and this prints the matrix. But if I take example from here, it does not provide any result except of similar error. How to fix it? It is my first steps in OpenCV, may be I do generally smth wrong and I need to start from smth else?