A Note on Data Transfer Objects (DTO)s

  1. Data Transfer Objects (DTOs) are introduced to decouple (JPA) entities from the UI
  2. DTOs are also motivated by their typesafe nature
  3. Lacking typesafety, JSON-P JsonObjects are not used as DTOs
  4. Most DTOs are exposed as HTTP/JSON
  5. Often 3rd party libraries are used to map a DTO into a JSON
  6. Sometimes DTOs are called Value Objects
  7. The vast majority of DTOs remains identical to entities over the entire lifecycle of a project
  8. Copying data between DTOs and entities requires series of getter-setter invocations
  9. DTOs are growing, the mapping logic is extracted into dedicated "mappers"
  10. DTOs and mappers introduce a significant amount of untested code, which disturbs the code coverage statistics
  11. Getters and setters, constructor tests are written to increase the code coverage
  12. Now: structural JPA entity code changes, affect DTOs, mappers and the corresponding unit tests
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