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

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?