[JavaJaxRs-resteasy] Missing @Valid annotation for bean-validation ( jaxrs-resteasy-eap generator)

Swagger-codegen version

3.0.25 - swagger-codegen-maven-plugin - generator jaxrs-resteasy-eap

Description

I generate java components from swagger with the jaxrs-resteasy-eap generator using swagger-codegen-maven-plugin maven plugin.
I define my "components" objects with validation restrictions such as maxLength:, given in the following example :

components:
  schemas:
    MyObject:
      type: object
      properties:
        uuid:
          type: string
          maxLength: 36

The problem is that the Java Code generated for MyObjectApi does not contain @Valid annotations and thus, validation is not properly working at all.

Steps to reproduce

1. Define a component with restrictions (on size with maxLength=36 for example) and a create_myobject path endpoint
2. Generate the java code with swagger-codegen-maven-plugin plugin and jaxrs-resteasy-eap generator
3. You'll find @Size(max=36) on your model object, but no @Valid on your MyObjectApi
4. Launch the project, and call your endpoint with an attribute that exceed the restriction (in my example, the uuid.length > 36).

The endpoint will be working instead of returning a 400 Bad request and ValidationException as expected.

Related issues/PRs

Same issue but with Java generator : PR https://github.com/swagger-api/swagger-codegen/pull/5517

Suggest a fix/enhancement

We could add the @Valid annotation to mustache template for generator jaxrs-resteasy-eap similar to what can be found in this PR: https://github.com/swagger-api/swagger-codegen/pull/5517 but for JavaJaxRs.

Start with the mustache templates used by the jaxrs-resteasy-eap generator and compare their handling with the Java generator change in PR 5517. Reproduce the example through swagger-codegen-maven-plugin; done means the generated MyObjectApi includes @Valid and constrained input produces the expected validation failure.