I am condsidering implementing a webApp using GWT for the frontend, and Play framework for the backend (according to this other question). I am considering that since the Play framework has a good reputation for simplicity (akin to Ruby on Rails to which the Play Framwork attributes its inspiration), and with GWT I can have my frontend coded in Java [compiling to JS] also.
I'd like to know what I can expect in the Play Framework backend to be simpler/easier compared to a pure GWT backend? What things does the Play Framework backend make simpler/easier that would take more time/complexity with a GWT backend? My interest includes the specific objective features or steps that the Play Framework takes care of for you, that a GWT backend would have to explicitly implement instead; so this is not just a subjective languageX vs languageY question.
Thanks in advance!