How do I remove these four methods, I don't want to generate them

Description

How do I remove these three methods, I don't want to generate them

            Logger log = LoggerFactory.getLogger(UseropenidApi.class);

            default Optional<ObjectMapper> getObjectMapper() {
                return Optional.empty();
                }

            default Optional<HttpServletRequest> getRequest() {
            return Optional.empty();
            }

            default Optional<String> getAcceptHeader() {
            return getRequest().map(r -> r.getHeader("Accept"));
            }

Swagger-codegen version

            <groupId>io.swagger</groupId>
            <artifactId>swagger-codegen-maven-plugin</artifactId>
            <version>2.4.12</version>

Swagger declaration file content or url

Command line used for generation

<configuration>
                    <!-- specify the swagger yaml -->
                    <inputSpec>${project.basedir}/../xxx-xxx-spec/src/main/swagger-spec/api.yaml</inputSpec>
                    <output>${project.basedir}/../xxx-api/swagger-code-gen</output>
                    <!--<output>swagger-codegen-javascript</output>-->
                    <!-- target to generate -->
                    <language>spring</language>
                    <!--<language>javascript</language>-->
                    <!-- pass any necessary config options -->
                    <modelPackage>x.xx.xxx.model</modelPackage>
                    <templateDirectory>src/main/swagger-templates/spring</templateDirectory>
                    <configOptions>
                        <defaultInterfaces>false</defaultInterfaces>
                        <sourceFolder>src/main/java</sourceFolder>
                        <apiPackage>x.xx.xxx.api</apiPackage>
                        <basePackage>x.xx.xxx</basePackage>
                        <interfaceOnly>true</interfaceOnly>
                        <java8>true</java8>
                        <jdk8>true</jdk8>
                        <dateLibrary>java8</dateLibrary>
                        <additional-properties>
                            jackson=true
                        </additional-properties>
                        <hideGenerationTimestamp>true</hideGenerationTimestamp>
                    </configOptions>
                    <verbose>true</verbose>
                </configuration>

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start with the Spring templates under the configured templateDirectory, src/main/swagger-templates/spring, and inspect how the generated UseropenidApi interface includes these methods. Review the swagger-codegen Maven plugin configuration, including defaultInterfaces, interfaceOnly, java8, and jdk8, then regenerate the API. Done means the unwanted methods no longer appear in the generated Java interface.