Ikai, let confirm you hypothesis ;) I faced the same problem with parameter 
having "new" prefix - renaming the parameter fixed the problem. My code 
before fix:
                        Query 
query=pm.newQuery(GaeQuestionAnswerBean.class);
query.setFilter("growKey == newGrowKey && ownerId == userId");
query.declareParameters("String newGrowKey, String userId");
oldQuestions = (List<GaeQuestionAnswerBean>)query.execute(newGrowKey, 
userId);
... and Exception:
  org.datanucleus.exceptions.NucleusUserException: CreatorExpression defined 
with class of GrowKey yet this class is not found

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