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I try to learn use JDO in GWT from https://developers.google.com/appengine/docs/java/datastore/jdo/creatinggettinganddeletingdata
In the first sample code, there is a line:
PersistenceManager pm = PMF.get().getPersistenceManager();
In this line, what is PMF? There is no answer in the tutorial, and I can not figured out.
PMF is a java class (Persistance Manager Factory)
You can find more information about it here : Information PMF
You can find Source Code here : PMF Source Code