maven-jetty-plugin not configured correctly

Following instructions from the reference documentation (Chapter 6.5. Deploying to Jetty) I get the following error after running "mvn war:inplace jetty:run -Pjetty"

[ERROR] Failed to execute goal org.mortbay.jetty:maven-jetty-plugin:6.1.21:run (default-cli) on project weld-jsf-numberguess: jetty-env.xml file does not exist at location /home/jharting/jboss/testing/Weld-1.1.0.Beta1/weld-1.1.0.Beta1/examples/jsf/numberguess/src/main/resources/jetty-env.xml -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.mortbay.jetty:maven-jetty-plugin:6.1.21:run (default-cli) on project weld-jsf-numberguess: jetty-env.xml file does not exist at location /home/jharting/jboss/testing/Weld-1.1.0.Beta1/weld-1.1.0.Beta1/examples/jsf/numberguess/src/main/resources/jetty-env.xml
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:141)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:77)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:69)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:82)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:54)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.singleThreadedBuild(DefaultLifecycleExecutor.java:218)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:190)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:246)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:95)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:430)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:160)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: jetty-env.xml file does not exist at location /home/jharting/jboss/testing/Weld-1.1.0.Beta1/weld-1.1.0.Beta1/examples/jsf/numberguess/src/main/resources/jetty-env.xml
at org.mortbay.jetty.plugin.AbstractJettyRunMojo.checkPomConfiguration(AbstractJettyRunMojo.java:258)
at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:382)
at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:210)
at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:105)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:133)
... 19 more

The jetty-env.xml file is present in src/main/webapp-jetty/WEB-INF/jetty-env.xml.