You need a Locator for the POIEntity. When sending an entity from client to server, you actually just send its ID and the modified properties. On the server side, the object is first retrieved from your datastore using its ID (using its static findPOIEntity method, or the Locator's find method), then setters are called for each modified property (and then the entity is passed to your service method, and only then the ServiceLocator will be used, if needed)
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