[BUG] [Java] [JaxRS] readOnly/writeOnly not respected in "required" attribute bean validaion

[mickroll]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Currently, the attribute parameters readOnly and writeOnly are ignored when generating bean validation @NotNull annotation.

Spec says:

If a readOnly or writeOnly property is included in the required list, required affects just the relevant scope.
see https://swagger.io/docs/specification/data-models/data-types/#readonly-writeonly

Using @NotNull on these fields is wrong, because it fails validation in the other direction, where the attribute is intentionally not present.

openapi-generator version

5.1.1

OpenAPI declaration file content or url

      "Example": {
        "type": "object",
        "required": ["displayName_r", "displayName_w"],
        "properties": {
          "displayName_r": {
            "type": "string",
            "readOnly": true
          },
          "displayName_w": {
            "type": "string",
            "writeOnly": true
          }
        }
      },

Generation Details

                            <generatorName>jaxrs-spec</generatorName>
                            <configOptions>
                                <interfaceOnly>true</interfaceOnly>
                                <returnResponse>false</returnResponse>
                                <sourceFolder>java</sourceFolder>
                                <useSwaggerAnnotations>false</useSwaggerAnnotations>
                                <generatePom>false</generatePom>
                                <dateLibrary>java8</dateLibrary>
                            </configOptions>

Steps to reproduce

1. Generate Code
2. Check contents of generated Example.java -> getters of displayName_r/displayName_w define @NotNull

Related issues/PRs

#9222: "readOnly/writeOnly not respected in jackson annotation"

Suggest a fix

Update beanValidation.mustache to respect readOnly/writeOnly markers:

{{#required}}{{^isReadOnly}}{{^isWriteOnly}}
  @NotNull
{{/isWriteOnly}}{{/isReadOnly}}{{/required}}
{{>beanValidationCore}}

instead of

{{#required}}
  @NotNull
{{/required}}
{{>beanValidationCore}}