Getting 404 while trying to access endpoints using Jersey 3 and Tomcat 10 - jersey

Question

Been trying for days to fix this problem. Just trying to recreate a simple "Hello World" REST api with Jersey 3 and Tomcat 10 in maven. After creating the WAR file of the project I can access the index.jsp (created by default when I created the project) but when I try to access the "/helloworld" endpoint I get error 404.
Here's my code:
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>web-app</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-jdk-http</artifactId>
<version>3.0.2</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>3.0.2</version>
</dependency>
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>5.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jakarta.servlet.jsp</groupId>
<artifactId>jakarta.servlet.jsp-api</artifactId>
<version>3.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jakarta.el</groupId>
<artifactId>jakarta.el-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jakarta.websocket</groupId>
<artifactId>jakarta.websocket-api</artifactId>
<version>2.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jakarta.security.enterprise</groupId>
<artifactId>jakarta.security.enterprise-api</artifactId>
<version>2.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jakarta.platform</groupId>
<artifactId>jakarta.jakartaee-web-api</artifactId>
<version>9.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>web-app</finalName>
</build>
</project>
HelloWorldResource
/*
* Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package jersey;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
/**
*
* #author Jakub Podlesak
*/
#Path("helloworld")
public class HelloWorldResource {
public static final String CLICHED_MESSAGE = "Hello World!";
#GET
#Produces(MediaType.TEXT_PLAIN)
public String getHello() {
return CLICHED_MESSAGE;
}
}
JaxRsApplication
/*
* Copyright (c) 2012, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package jersey;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import jakarta.ws.rs.ApplicationPath;
import jakarta.ws.rs.core.Application;
/**
* JAX-RS Application class for this example.
*
* #author Martin Matula
*/
#ApplicationPath("/api")
public class JaxRsApplication extends Application {
private final Set<Class<?>> classes;
public JaxRsApplication() {
HashSet<Class<?>> c = new HashSet<Class<?>>();
c.add(HelloWorldResource.class);
classes = Collections.unmodifiableSet(c);
}
#Override
public Set<Class<?>> getClasses() {
return classes;
}
}
The error
Picture
Using jdk 11, and I've tried deploying both in a Docker with Tomcat 10 and locally directly downloading the Tomcat Server into my PC.
Suggestions?

Answer 1

Jersey requires an appropriate container module to deploy the REST application. You added jersey-container-jdk-http, which works with a JDK Http Server (cf. documentation).
What you need instead is the jersey-container-servlet module (cf. documentation), which works in every Servlet 3.x environment. Therefore you need to add this dependency:
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>3.0.2</version>
</dependency>
Remark: Tomcat 10 is not a complete Jakarta EE 9 server, so you should also remove the jakarta.jakartaee-web-api dependency.