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Database schema and custom Micronaut validators
We have dedicated migrations for defining the database schema.
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This ensures the validation routines are called on the model.
You should also get a validation exception should it fail.
Validating that a property is not null
@NonNull is a compiler and tooling suggestion whereas @NotNull is a validation directive for validated classes.
If you want to validate a property is not null make sure it also has the NotNull @NotNull variant.
I would say rule of thumb, is that you either want both or just NonNull.