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Please keep the questions Java EE-stic. Means: as short and as concise as only possible. Feel free to ask several, shorter questions.
@qnoid: Blaze-Persistence Entity Views might be of interest to you for your JSON serialization use case. You can create your JSON-DTOs as java classes i.e. entity views and provide the mapping back to the entity model based on JPQL. Behind the scenes, it will fetch only the data that you actually need.
Spring Data Projections is a similar but more limited technology of the Spring ecosystem.