Morphia is a great ORM framework that maps your Java objects to mongo documents.
A general advice would be to refrain from using primitive types like int, long, double in the DO and instead substitute them with their wrapper class counterparts. This is because Morphia defaults values for the fields with primitive types in case no value has been entered for them. This is an undesirable behavior most of the times especially when the default values have other meaning in your domain context.
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