OpenAPI Swagger not showing examples - swagger

Question

We are using OpenAPI and openapi-generator-maven-plugin with Spring Boot. We're trying to create an example object in our response. We've followed the suggestions of a number of different web pages, especially this one:
https://swagger.io/docs/specification/adding-examples/
But no matter what we try, we either can't get the example data to show up, or it gives us a compile error.
For instance, this seems to be what we should be using, from the doc we've seen:
patch:
tags:
- Color
operationId: testing
description: test
responses:
'200':
description: Return existing colors in a season
content:
application/json:
schema:
type: object
properties:
testName:
type: string
example:
testname: amy
But this is causing compile errors in the generated code for the API:
ApiUtil.setExampleResponse(request, "application/json", "\"{\\"testname\\":\\"amy\\"}\"");
There are too many escape characters in the code above, there should not be double escapes.
Here is the plugin config from our POM:
<plugin>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-maven-plugin</artifactId>
<version>4.0.0</version>
<executions>
<execution>
<id>FlexPLM-ACL</id>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<inputSpec>${project.basedir}/apis/flexplm-acl.yml</inputSpec>
<generatorName>spring</generatorName>
<apiPackage>com.dcsg.pdcomm.flexplmacl.api</apiPackage>
<!-- Both of these APIs use the exact same DTOs, so we have put them into the same package -->
<modelPackage>com.dcsg.pdcomm.flexplm.dto</modelPackage>
<modelNameSuffix>DTO</modelNameSuffix>
<supportingFilesToGenerate>ApiUtil.java</supportingFilesToGenerate>
<configOptions>
<library>spring-boot</library>
<dateLibrary>java8</dateLibrary>
<java8>true</java8>
<interfaceOnly>true</interfaceOnly>
</configOptions>
<output>${project.build.directory}/generated-sources</output>
</configuration>
</execution>
</executions>
</plugin>
We've tried all different combinations of quoting and indentation, but to no avail. Please help us!