[BUG] `example:` - List<String> and Map<String, XXX> doesn't create correct annotations (`spring`)

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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

I'm trying to generate examples for the array and additionalProperties. However, the @Schema(example="...") is incorrect.

  allSchemaIds:
    type: array
    items:
      type: string
    description: list of all the supported schemas in this system
    example:
        - iso19115-3.2018
        - iso19139

When using the spring generator, I get this annotation:

@Schema(name = "allSchemaIds", example = "[iso19115-3.2018, iso19139]", description = "list of all the supported schemas in this system", requiredMode = Schema.RequiredMode.NOT_REQUIRED)

When I request the openapi document from spring, I get this:

"allSchemaIds": {
            "type": "array",
            "description": "list of all the supported schemas in this system",
            "example": "[iso19115-3.2018, iso19139]",
            "items": {
              "type": "string",
              "description": "list of all the supported schemas in this system",
              "example": "[iso19115-3.2018, iso19139]",
              "xml": {
                "name": "allSchemaIds"
              }
            }
 },

I believe this should be "example": "[\"iso19115-3.2018\", \"iso19139\"]", or something similar.

For the map example:

  recordsPerSchema:
    type: object
    additionalProperties:
      type: integer
    description: map from the schemaId (schema name) to the number of records of that schema type in this system
    example:
      iso19115-3.2018: 4
      iso19139: 39

When using the spring generator, I get this annotation:

@Schema(name = "recordsPerSchema", example = "{iso19115-3.2018=4, iso19139=39}", description = "map from the schemaId (schema name) to the number of records of that schema type in this system", requiredMode = Schema.RequiredMode.NOT_REQUIRED)

This is incorrect. I think the key's need to be quoted and the = changed to a :

example = "{\"iso19115-3.2018\":4, \"iso19139\":39}"

I took a quick look at the moustache (https://github.com/OpenAPITools/openapi-generator/blob/d318752478b620b3b697b973f86a1a90dbc1acb1/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache#L240) and I think its, probably, in the parsing or in how its going from the internal java object to string.

openapi-generator version

7.16.0

OpenAPI declaration file content or url

openapi-schema.zip

Generation Details

<build>
    <sourceDirectory>src/main/java</sourceDirectory>
    <plugins>
      <plugin>
        <groupId>org.openapitools</groupId>
        <artifactId>openapi-generator-maven-plugin</artifactId>
        <version>7.16.0</version>
        <executions>
          <execution>
            <goals>
              <goal>generate</goal>
            </goals>
            <configuration>
              <inputSpec>${project.basedir}/src/openapi-schema/workshop2-openapi.yaml</inputSpec>
              <generatorName>spring</generatorName>
              <generateAliasAsModel>true</generateAliasAsModel>
              <modelNamePrefix>Workshop2</modelNamePrefix>
              <modelNameSuffix>Dto</modelNameSuffix>
              <generateApiTests>false</generateApiTests>
              <generateModelTests>false</generateModelTests>
              <typeMappings></typeMappings>
              <configOptions>
                <sourceFolder>src/gen/java/main</sourceFolder>

                <interfaceOnly>true</interfaceOnly>

                <useJakartaEe>true</useJakartaEe>
                <useSpringBoot3>true</useSpringBoot3>
                <library>spring-boot</library>
                <useSpringfox>false</useSpringfox>

                <annotationLibrary>swagger2</annotationLibrary>
                <generateBuilders>true</generateBuilders>
                <withXml>true</withXml>
                <useOptional>false</useOptional>
                <!--                <openApiNullable>true</openApiNullable>-->

                <apiPackage>org.geonetwork.workshop2</apiPackage>
                <modelPackage>org.geonetwork.workshop2.model</modelPackage>
                <!--                <generateGenericResponseEntity>true</generateGenericResponseEntity>-->
                <!--                <useResponseEntity>false</useResponseEntity>-->

              </configOptions>
              <additionalProperties>
                <!--                <generateGenericResponseEntity>true</generateGenericResponseEntity>-->
                <!--                <useResponseEntity>false</useResponseEntity>-->

              </additionalProperties>
            </configuration>
          </execution>
        </executions>
      </plugin>

Steps to reproduce

Related issues/PRs

I tried doing a search, but every issue has the word "example" in it...

Suggest a fix

see description

Reproduce the issue with the attached OpenAPI schema using the spring generator and inspect the generated annotation in JavaSpring/pojo.mustache around the referenced line. Trace how array and additionalProperties examples become annotation strings, then verify the generated annotations and returned OpenAPI document use valid JSON-style array and map examples.