Spring-boot bean validation custom message for generated bean

Question

I'm trying to add validation to a bean so I can verify its state before persisting it. The class for the bean that requires validation is generated by the openapi-generator-maven-plugin plugin from an OpenAPI contract. As the contract contains restrictions, they Jakarta constraint annotations are present on the generated bean as well. It looks like this (simplified):

public class User {

    @NotNull
    private String name;
}

I added a messages.properties file in the src/main/resources folder with the following content:

jakarta.validation.constraints.NotNull.message=global not null error message

If I then execute the jakarta.validation.Validator.validate(user), the interpolated message matches the configured one. But this configuration applies to all properties that are null, while I only want to apply this to this specific property.

Is there a way I can configure the bean validator to return a specific message through configuration, without having to modify the bean (as it is generated)? I tried to add the following to the messages.properties (suggested by AI):

org.company.User.name.NotNull=Username cannot be null

But the validation framework just seems to ignore this?

All help is appreciated.

Roberto Foglia · Accepted Answer · 2024-11-12 21:03:48Z

0

You should set up the message field of the annotation.

@NotNull(message = "{org.company.User.name.NotNull}")
private String name;

answered Nov 12, 2024 at 21:03

Roberto Foglia

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2 Comments

Arno Turelinckx Over a year ago

I'm sure this would work, but since the class is generated, I'm not able to modify it (directly)

Roberto Foglia Over a year ago

You could use openapi-generator.tech/docs/file-post-processing or create a custom generator extending that one.

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