How to make the simplest HelloWorld servlet with maven without web.xml

Question

As a green hand, I created a HelloWorld servlet:

package com.rx.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/helloworld")
public class HelloWorld extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    PrintWriter writer = response.getWriter();
    writer.write("<html><body>Hello World</body</html>");
  }
}

Then there is the following configuration in my pom.xml:

<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>rx.helloworld</groupId>
<artifactId>simpleservlet</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>simpleservlet Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<war.name>simpleservlet</war.name>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<servlet.version>4.0.1</servlet.version>
</properties>
<dependencies>
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>${servlet.version}</version>
  <scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>${war.name}</finalName><!-- name of the bundled project when it is finally built -->
<plugins>
    <plugin>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-maven-plugin</artifactId>
      <version>9.3.9.v20160517</version>
      <configuration>
        <httpConnector>
          <!--host>localhost</host-->
        </httpConnector>
      </configuration>
    </plugin>
</plugins>
</build>
</project>

I read from servlet specification document, where told that

A web application is NOT required to contain a web.xml if it does NOT contain any Servlet, Filter, or Listener components or is using annotations to declare the same. In other words an application containing only static files or JSP pages does not require a web.xml to be present.

I indeed used the @WebServlet, so did not include the web.xml.

The full code base is here

Question: But when I try to run it with jetty with command mvn jetty:run, I can't find my servlet at all. How to resolve this problem?

Jetty will support servlet 4.0 at [version 10](https://github.com/eclipse/jetty.project/issues/1799). However, the web.xml is optional in servlet 3.1.0, too. Your servlet is not responding at `http://localhost:8080/helloworld`? — seb.wired, Mar 08 '19 at 15:58

score 1 · Answer 1 · answered Mar 08 '19 at 19:46

Eventually figured out by myself, say it missed a configuration in the maven-war-plugin:

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
            <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
</plugin>

The failOnMissingWebXml should be configured false, which is not the default value

How to make the simplest HelloWorld servlet with maven without web.xml

1 Answers1