HTTP ERROR 404 | Maven: Build do zero a web

Seguindo o passo-a-passo da aula não é possível abrir a url

porque tive problemas de:

Description Resource Path Location Type Dynamic Web Module 3.1 requires Java 1.7 or newer. lojaweb line 1 Maven Java EE Configuration Problem

Então pesquisei no fórum e atualizei meu pom.xml (utilizar o java 8) para:

<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>br.com.alura.maven</groupId>
    <artifactId>lojaweb</artifactId>
    <packaging>war</packaging>
    <version>1.0.0-SNAPSHOT</version>
    <name>lojaweb Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>


    </dependencies>
    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.eclipse.jetty</groupId>
                    <artifactId>jetty-maven-plugin</artifactId>
                    <version>9.4.6.v20170531</version>
                    <configuration>
                        <scanIntervalSeconds>10</scanIntervalSeconds>
                        <webApp>
                            <contextPath>/test</contextPath>
                        </webApp>
                    </configuration>
                </plugin>

                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.1</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>

            </plugins>
        </pluginManagement>

        <finalName>lojaweb</finalName>
    </build>
</project>

Ajustei o compiler level, build path e project facets todos para utilizar o java 1.8 e servlet 3.1.

Atualizei o web.xml:

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
</web-app>

meu servlet:

package br.com.alura.maven.lojaweb;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns="/contato")
public class ContatoServlet extends HttpServlet{
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();
        writer.println("<html><h2>Entre em Contato</h2></html>");
        writer.close();
    }

}

compilei: mvn copile executei o jetty: mvn jetty:run abri a url: http://localhost:8080/contato

resultado:

HTTP ERROR 404

Problem accessing /contato. Reason:

Not Found

adicionei o contexto (na aula não tem isso):

http://localhost:8080/lojaweb/contato

resultado:

HTTP ERROR 404

Problem accessing /lojaweb/contato. Reason:

Not Found

Editando:

após rever meu pom.xml vi que o contexto está test. Abri a url:

http://localhost:8080/test/contato

e funcionou.