Update Projection section in reference documentation. #3449
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For the time being we at least now document the current behaviour and how to cope with it. See: #3286
schauder
requested changes
Apr 26, 2024
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| [NOTE] | ||
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| Some JPA providers may require additional hints when working with <<projections.dtos,Class-based projections>> especially when using those directly with method derived queries. |
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That confuses me. @PersistenceCreator is a Spring Data annotation, I'm sure that JPA providers don't care about that.
I would expect that the situation is more: We need either a constructor taking all the properties as arguments and if it isn't the only constructor we need it to be marked with @PersistenceCreator.
| [NOTE] | ||
| ==== | ||
| Some JPA providers may require additional hints when working with <<projections.dtos,Class-based projections>> especially when using those directly with method derived queries. | ||
| If you are facing errors like `JpaSystemException: Specified result type did not match Query selection type` make sure to provide a constructor hint via `@PersistenceCreator` to be passed on, as outlined below: |
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It isn't so much outlined below but demonstrated, isn't it?
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Related to: #3286