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

Created by: 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?
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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

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

Related issues/PRs

#9222 (closed): "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}}