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add a CAUTION about misuse of auto-apply converters to doc #10913

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Sep 11, 2025
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add a CAUTION about misuse of auto-apply converters to doc #10913

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8 changes: 8 additions & 0 deletions documentation/src/main/asciidoc/introduction/Entities.adoc
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Expand Up @@ -778,6 +778,14 @@ On the other hand, if we _don't_ set `autoapply=true`, then we must explicitly a
EnumSet<DayOfWeek> daysOfWeek;
----

[CAUTION]
====
Converters are supposed to be used for type conversion.
Some enterprising members of the community have noticed that they can be (mis)used to perform other tasks: trimming whitespace, normalizing case, assigning a default value in place of `null`, and so on.
Hibernate _tolerates_ but does not encourage such (mis)use.
In particular, we strongly recommend against defining an `autoApply` converter acting on a <<basic-type-list,basic type>>.
====

All this is nice, but it probably won't surprise you that Hibernate goes beyond what is required by JPA.

[[compositional-basic-types]]
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