[BUG][JAVA] jaxrs-cxf producing xml annotations with enum (instead of json)

Description

Java enums are produced with annotations of javax.xml.bind.annotation.* whereas it should be com.fasterxml.jackson.annotation.* only. But those JSON annotations are missing, though it’s jax-rs!

File which contains the bug

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/JavaJaxRS/cxf/enumClass.mustache

This is our current workaround, instead of type: string / enum: [a,b,c] we are putting a reference to a schema.

Only with this workaround annotations are produced correctly.

in pom.xml

    <plugin>
        <groupId>org.openapitools</groupId>
        <artifactId>openapi-generator-maven-plugin</artifactId>
        <version>4.2.2</version>
        <executions>
            <execution>
                <id>myid</id>
                <goals>
                    <goal>generate</goal>
                </goals>
                <configuration>
                    <inputSpec>${project.basedir}/../api/example.yaml</inputSpec>
                    <generatorName>jaxrs-cxf</generatorName>
                    <generateApis>false</generateApis>
                    <generateApiTests>false</generateApiTests>
                    <generateApiDocumentation>false</generateApiDocumentation>
                    <generateModels>true</generateModels>
                    <generateModelTests>false</generateModelTests>
                    <generateModelDocumentation>false</generateModelDocumentation>
                    <invokerPackage>mypackage.invoker</invokerPackage>
                    <apiPackage>mypackage.api</apiPackage>
                    <modelPackage>mypackage.model</modelPackage>
                    <output>${project.basedir}</output>
                    <withXml>false</withXml>
                    <configOptions>
                        <java8>true</java8>
                        <dateLibrary>java8</dateLibrary>
                        <generateNonSpringApplication>true</generateNonSpringApplication>
                        <useBeanValidationFeature>true</useBeanValidationFeature>
                        <useBeanValidation>false</useBeanValidation>
                        <useAnnotatedBasePath>true</useAnnotatedBasePath>
                    </configOptions>
                </configuration>
            </execution>
        </executions>
    </plugin>

Related issues/PRs

Maybe the bug has been mentioned here
https://github.com/swagger-api/swagger-codegen/issues/4160
But that’s been Nov 8, 2016 and that time it was for swagger-codegen.

Start with modules/openapi-generator/src/main/resources/JavaJaxRS/cxf/enumClass.mustache and inspect how enum annotations are selected for the jaxrs-cxf generator. Reproduce generation using the enum schema described in the issue, then verify the generated enum uses the expected Jackson annotations without the unintended JAXB XML annotations.