About Book-Example-Vaadin7 source code demo

Dear Sir

When I download book-example-vaadin7 source code,and implement the project.

Always get error message.Have someone can reply this problem ??

Thank you so much.

Use

Vaadin 7.5.10
Java 1.6
TomEE 1.7.2
eclipse Juno

Why can not find 'com.vaadin.book.MyCustomServlet' ??

I didn't change default web.xml.

================ TomEE Console Error =======================

Unable to deploy collapsed ear in war StandardEngine[Catalina].StandardHost[localhost].StandardContext[/book-examples-vaadin7]
org.apache.openejb.OpenEJBException: Unable to load servlet class: com.vaadin.book.MyCustomServlet: com.vaadin.book.MyCustomServlet
    at org.apache.openejb.config.AnnotationDeployer$ProcessAnnotatedBeans.deploy(AnnotationDeployer.java:2113)
    at org.apache.openejb.config.AnnotationDeployer$ProcessAnnotatedBeans.deploy(AnnotationDeployer.java:1843)
    at org.apache.openejb.config.AnnotationDeployer.deploy(AnnotationDeployer.java:360)
    at org.apache.openejb.config.ConfigurationFactory$Chain.deploy(ConfigurationFactory.java:403)
    at org.apache.openejb.config.ConfigurationFactory.configureApplication(ConfigurationFactory.java:971)
    at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1227)
    at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1100)
    at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:130)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5416)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: com.vaadin.book.MyCustomServlet
    at org.apache.openejb.core.TempClassLoader.loadClass(TempClassLoader.java:176)
    at org.apache.openejb.core.TempClassLoader.loadClass(TempClassLoader.java:80)
    at org.apache.openejb.config.AnnotationDeployer$ProcessAnnotatedBeans.deploy(AnnotationDeployer.java:2106)
    ... 18 more

Please see here for detailed instructions:
https://github.com/vaadin/book-examples 

I tried myself without any error.