Dears,

 Please try to replace your code with following code and try.

   * @PrimaryKey*
* @Persistent*
* private Key contextKey;*
*
*
 And persist your object to store by following way.
  
        (User is an Pojo in my application)

    Key key=KeyFactory.createKey(User.class.getSimpleName(), user.getUid());
 user.setKey(key);  // you should provide a set mothod to set the Key to 
your filed.
 pm.makePersistent(user);


Bevis.

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