Initializing AppEngine server

Hi,

When I create a new google web application by using eclipse, it cannot
implement the basic example (web application starter project).

I run this example by using 'debug as web application'. The error is
'URL.<init>(URL, String, URLStreamHandler) line: not available'. This
is weird because it worked before and i didn't change anything.
Does it mean it lacks some jar file?

Thanks

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