In my project, I need to store chinese characters to datastore, but I
tried using the following code to do it:

PersistenceManager pm = PMF.get().getPersistenceManager();
                Greeting e = new Greeting("许凌志","大家好",new Date
(System.currentTimeMillis()));
try {
       pm.makePersistent(e);
} finally {
       pm.close();
}

But when I read it out,  the chinese characters turns to be "???".
Does anybody knows how to solve this problems?
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