How can I add a hello world servlet to an existing Spring application, without Spring MVC or Boot?

My goal is to have a servlet that will return an index.html file when it is first called, then the user will enter a userId, and that userId will be stored in a session object, then each time the user makes a request to some REST services (already implemented by somebody else), it will include the userId. But before I get ahead of myself, I just need to see Hello World working first:

public class MyRequestHandler implements HttpRequestHandler {
@Override
public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().println("hello, world");
}

web.xml:

 <servlet-mapping>
  <servlet-name>MyServlet</servlet-name>
  <url-pattern>/index</url-pattern>
 </servlet-mapping>

<servlet>
 <servlet-name>MyServlet</servlet-name>
 <servlet-class>com.xyz.MyRequestHandler</servlet-class>
 <load-on-startup>1</load-on-startup>
</servlet>

When I start up jetty I get the following exception because the class file is not built and deployed in the com.xyz folder under target/classes:

java.lang.ClassNotFoundException: com.xyz.MyRequestHandler  at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)  at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)  at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)  at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:450)     at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403)     at org.eclipse.jetty.util.Loader.loadClass(Loader.java:86)  at org.eclipse.jetty.servlet.BaseHolder.doStart(BaseHolder.java:95)     at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:338)  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)  at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:870)     at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:298)     at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)  at org.eclipse.jetty.maven.plugin.JettyWebAppContext.startWebapp(JettyWebAppContext.java:296)   at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)   at org.eclipse.jetty.maven.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:365)   at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)  at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)   at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:163)     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)  at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)   at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)  at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)   at org.eclipse.jetty.server.Server.start(Server.java:387)   at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)    at org.eclipse.jetty.server.Server.doStart(Server.java:354)     at org.eclipse.jetty.maven.plugin.JettyServer.doStart(JettyServer.java:73)  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)  at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:534)  at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:357)     at org.eclipse.jetty.maven.plugin.JettyRunMojo.execute(JettyRunMojo.java:167)   at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)  at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)  at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)  at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)  at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)  at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:355)   at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)     at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)     at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:216)  at org.apache.maven.cli.MavenCli.main(MavenCli.java:160)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:483)     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)  at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)  at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

Would really appreciate some help with this.