Server side validators not working correctly with array form binding

[aspan]

Describe the bug

The error messages are not displayed on the field for server side validators when using the array data binding.

The parameterName is generated with bracket notation from the server side and it looks like this:

"parameterName":"pets[0].description"

The frontend code expects the parameterName to look like this:

"parameterName":"pets.0.description"

Expected-behavior

The server side validation message should be shown.

Reproduction

I modified the pet clinic project to demonstrate the issue available here: https://github.com/aspan/spring-petclinic-hilla/tree/develop

The Owner edit form has been modified to add a server side validator to the description of a pet in the list of pets requiring between 3 and 100 characters.

I added a small servlet filter to replace the server side response body with the correct parameterName in org.springframework.samples.petclinic.FixValidationResponseWithBrackets

The project currently works because of the servlet filter but as soon as it is removed the validation error message is not shown any more.

System Info

Hilla 24.6.0