I am experiencing a similar problem attempting to use the OpenSource code: https://code.google.com/p/20thingsilearned/
Every change in JRE and Java SDK changes the error received, but the application still doesn't operate. With JRE 7 and App Engine 1.7.4, the following two errors prevent the application from successfully running: -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
