Hello Liu, 

The error may have various origins. You should try including the app engine 
dependency in your pom.xml. 

This discussion group is oriented more towards general opinions, trends, 
and issues of general nature touching App Engine. For coding in Java, and 
software architecture, as well as registering dependencies, you may be 
better served in dedicated forums such as stackoverflow, where experienced 
programmers are within reach and ready to help. If you think this a Cloud 
Platform related problem, you are encouraged to open a private issue in the 
Public Issue Tracker, where private information, such as project names, can 
be securely exchanged. 

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