Re: Request implementation couldn't be found.

To handle server-side errors I have defined an custom servlet extending the default RequestFactoryServlet and passed a custom exception handler in the constructor.. That has shown me a real causes of my problem located on the server side. 

Good tutorial to define a custom servlet can be found here . I hope it will also help others. My problem  was JPA and particularly @GeneratedValue annotation for Id because that uses a native generating policy and datanucleus is not supporting it. So i had to define another one . 

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