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Problem with JDO on google app engine

 
Greenhorn
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First post here I am having trouble saving an object on google app engine. Here is my POJO class:



Here is my JDO Code.:


Things go wrong when making the call to makePersistent. The exception is:

I have tried google and nothing. Does anybody know what Im doing wrong? Thanks.
 
Consider Paul's rocket mass heater.
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