Response status code 500 on JAX-RS 3.0 application deployed to Tomcat 10

Question

I have a JAX-RS 3.0 application that is run in Tomcat 10.

The pom.xml:

<properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>

    <dependencies>

        <!-- the REST API -->
        <dependency>
            <groupId>jakarta.ws.rs</groupId>
            <artifactId>jakarta.ws.rs-api</artifactId>
            <version>3.0.0</version>
        </dependency>

        <!-- These next two are needed because we are using Tomcat, which  -->
        <!-- is not a full JEE server - it's just a servlet container.     -->

        <!-- the Jersey implementation -->
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>3.0.2</version>
        </dependency>

        <!-- also needed for dependency injection -->
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
            <version>3.0.2</version>
        </dependency>

        <!-- support for using Jackson (JSON) with Jersey -->
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>3.0.2</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>15</source>
                    <target>15</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.3.1</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>3.1.2</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

and the config class for application path:

import jakarta.ws.rs.ApplicationPath;
import jakarta.ws.rs.core.Application;

@ApplicationPath("api")
public class App extends Application {
    // the entry class - deliberately empty in this basic demo
}

and DemoResource:

import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.PathParam;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;

//
// Pingable at:
// http://localhost:8080/JaxRsDemo/api/demo/ping
//
@Path("/demo")
public class DemoResource {

    @GET
    @Path("/ping")
    public String ping() {
        System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%");
        return "Service online";//Response.ok("Service online", MediaType.APPLICATION_JSON).build();
    }
}

So I make it as .war file and put it in webapp of tomcat 10 and it is deployed successfully.

I request such http://localhost:8080/JaxRsDemo-1.0-SNAPSHOT/api/demo/ping, the ping() method of DemoResource is fired and System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"); is shown in console of tomcat but there is no response-body in client side like browser and the status of response in browser is 500.

Where is wrong and something is missed in my sample application?