Hi Robert. Bravo. This approach solved problem.

We are using objectify and for quick test reason I have used this to set 
this internal 'connection' entity group:

try {
     dao.ofy().getDatastore().get(KeyFactory.createKey("Random", new 
Random().nextLong()));
} catch (EntityNotFoundException e) {
      // Ignore
}

Deferred implementation that we use doesn't have access to request headers 
(but on Monday or Tuesday maybe it will have ;)). There is no reason to use 
costly random class when task name is unique. 

Now question is how to set their internal transaction entity group so that I 
don't need to use one get datastore operation with throwing exception?

Tnx, MATijA.

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