how to avoid default method implementation in swagger codegen interface?

Question

I would like to avoid "default" implementation in interface generate by the maven plugin swagger codegen. For example, with petstore swagger : http://petstore.swagger.io/v2/swagger.json

I generate interface with maven plugin :

            <plugin>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-codegen-maven-plugin</artifactId>
            <version>2.2.3</version>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                    <configuration>
                        <inputSpec>./src/main/resources/swagger/api.yml</inputSpec>
                        <language>spring</language>
                        <generateSupportingFiles>false</generateSupportingFiles>
                        <configOptions>
                            <interfaceOnly>true</interfaceOnly>
                            <java8>true</java8>
                        </configOptions>
                    </configuration>
                </execution>
            </executions>
        </plugin>

I generate interface like PetApi.java with default implementation of methods :

    default ResponseEntity<Void> addPet(@ApiParam(value = "Pet object that needs to be added to the store" ,required=true )  @Valid @RequestBody Pet body) {
    // do some magic!
    return new ResponseEntity<Void>(HttpStatus.OK);
    }

I would like to avoid it like

    ResponseEntity<Void> addPet(@ApiParam(value = "Pet object that needs to be added to the store" ,required=true )  @Valid @RequestBody Pet body);

Is it possible to do it ?

Update March 2020:

According to new OpenAPI Tool openapi-generator
There is an option with spring (language is DEPRECATED, use generatorName)

skipDefaultInterface

https://github.com/OpenAPITools/openapi-generator/blob/master/docs/generators/spring.md

Answer 1

As per documentation the following should solve it:

<configOptions>
     <skipDefaultInterface>true</skipDefaultInterface>
</configOptions>