[Java, Maven] swagger-codegen-maven-plugin, how invoke build without cleaning existing folders Issue: Bug

Description

I have the following swagger-codegen-maven-plugin.

How do I run this plugin so it DOES NOT blow away existing output in this folder (i.e. implement flag cleanOutputDir in org.codehaus.mojo jaxb2-maven-plugin)

<plugin>
				<groupId>io.swagger</groupId>
				<artifactId>swagger-codegen-maven-plugin</artifactId>
				<version>2.2.2</version>
				<executions>
					<execution>
						<goals>
							<goal>generate</goal>
						</goals>
						<id>generate-sources</id>
						<phase>generate-sources</phase>
						<configuration>
							<output>${project.build.directory}</output>
							specify the swagger yaml
							<inputSpec>src/main/resources/swagger/swagger.yaml</inputSpec>
							target to generate java client code
							<language>jaxrs-cxf</language> 
							<configOptions>
						 	 <sourceFolder>generated</sourceFolder>   
								<dateLibrary>joda</dateLibrary> 
								<apiPackage>com.api</apiPackage>
								<modelPackage>com.api.model</modelPackage>
							</configOptions> 
						</configuration>
					</execution>
				</executions>
			</plugin>   

Swagger-codegen version

2.2.2

Swagger declaration file content or url

N/A

Command line used for generation

N/A

Steps to reproduce

N/A

Related issues

N/A

Suggest a Fix

Start with the swagger-codegen-maven-plugin generate goal and its output configuration in version 2.2.2. Reproduce the behavior with the provided Maven configuration, then determine the current handling of existing output and define completion as preserving existing folders or documenting the supported configuration; no source file, test, or command is named.