[BUG] documented library configOption is not available.

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
  3.3.4
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
  Actual: Jackson annotations.
  Expected: Jsonp / Jsonb / Liberty
• [Optional] Bounty to sponsor the fix

Description

The documentation at https://openapi-generator.tech/docs/generators/jaxrs-spec describes the configOption "library". However, it does not work:

java.lang.RuntimeException: Unknown library: openliberty
Available libraries:
  NONE

openapi-generator version

3.3.4

OpenAPI declaration file content or url

The other way round… I am Posting the maven part instead.

      <plugin>
        <groupId>org.openapitools</groupId>
        <artifactId>openapi-generator-maven-plugin</artifactId>
        <executions>
          <execution>
            <phase>generate-sources</phase>
            <goals>
              <goal>generate</goal>
            </goals>
            <configuration>
              <inputSpec>${project.basedir}/src/main/resources/pipeline.yaml</inputSpec>
              <generatorName>jaxrs-spec</generatorName>
              <configOptions>
                <sourceFolder>src/main/java</sourceFolder>
                <interfaceOnly>true</interfaceOnly>
                <useSwaggerAnnotations>false</useSwaggerAnnotations>
                <library>openliberty</library>
                <java8>true</java8>
                <dateLibrary>java8</dateLibrary>
              </configOptions>
            </configuration>
          </execution>
        </executions>
      </plugin>

Command line used for generation

mvn clean verify

Steps to reproduce

mvn clean verify

With above configuration, it is 100% reproducible

Related issues/PRs

none found

Suggest a fix

1. make sure the library option works

2. document what library=openliberty actually does (I do not know of a OpenLiberty specific API)

3. Implement jsonp or jsonb instead (<library>jsonb</library>). The current default is Jackson, which is not even an API and forces the application to ship Jackson :(
   More information: https://javaee.github.io/jsonb-spec/

Start with the jaxrs-spec generator documentation and the Maven plugin configuration shown in the report, then run mvn clean verify with library=openliberty to confirm the failure. Compare the documented library values with the generator's accepted options; done means the configured library is recognized and its behavior is documented, or the unsupported option is removed from the documentation.