[google-appengine] did you forget to inherit a required module? about JDO

[lily]

Compiling module com.Demo3
   Refreshing module from source
      Validating newly compiled units
         Removing units with errors
            [ERROR] Errors in 'file:/D:/eclipasejava/demo3/src/com/
client/PMF.java'
               [ERROR] Line 7: No source code is available for type
javax.jdo.PersistenceManagerFactory; did you forget to inherit a
required module?
               [ERROR] Line 8: No source code is available for type
javax.jdo.JDOHelper; did you forget to inherit a required module?
            [ERROR] Errors in 'file:/D:/eclipasejava/demo3/src/com/
client/neww.java'
               [ERROR] Line 30: No source code is available for type
javax.jdo.PersistenceManagerFactory; did you forget to inherit a
required module?
               [ERROR] Line 31: No source code is available for type
javax.jdo.JDOHelper; did you forget to inherit a required module?
         Removing invalidated units
            [WARN] Compilation unit 'file:/D:/eclipasejava/demo3/src/
com/client/Demo3.java' is removed due to invalid reference(s):
               [WARN] file:/D:/eclipasejava/demo3/src/com/client/
neww.java
   Computing all possible rebind results for
'com.example.cal.client.CalendarApp'
      Rebinding com.example.cal.client.CalendarApp
         Checking rule <generate-with
class='com.google.gwt.user.rebind.ui.ImageBundleGenerator'/>
            [ERROR] Unable to find type
'com.example.cal.client.CalendarApp'
               [ERROR] Hint: Check that the type name
'com.example.cal.client.CalendarApp' is really what you meant
               [ERROR] Hint: Check that your classpath includes all
required source roots

I don't know what's wrong with me?
if i  use gwt without jdo ,it's fine.
if i  use jdo without gwt,it's fine,too.
but when i want to use it,it will be fails.

GreetingService.java
GreetingServiceAsync.java
GreetingServiceAsync.java
Demo3.java
User.java
PMF.java     in client
and
GreetingServiceImpl.java in server

i also have
Demo3.gwt.xml
and web.xml
please help me.

我不知道為什麼會失敗
都有照著google 給的範例去執行
jdo在沒有gwt的輔助下是能運行的
主程式是Demo3檔
謝謝

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