RX JAVA + Retrofit sdk generation using Swagger codegen

You can generate a Java Retrofit API client with RxJava enabled using the following command as an example:

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate \
-l java -i http://petstore.swagger.io/v2/swagger.json \
-c /var/tmp/retrofit2rx/java-petstore-retrofit2rx.json \
-o /var/tmp/retrofit2rx 

and the JSON config file (/var/tmp/retrofit2rx/java-petstore-retrofit2rx.json) defines the following:

{
  "library": "retrofit2",
  "artifactId": "swagger-petstore-retrofit2-rx",
  "useRxJava": true,
  "hideGenerationTimestamp": true
}

You can then find the auto-generated code under the /var/tmp/retrofit2rx folder.

Please use the latest stable version of Swagger Codegen instead: https://github.com/swagger-api/swagger-codegen/releases, or pull the latest master of swagger-codegen to enjoy the enhancements and bug fixes.

To get a list of options for customizing the Java API client, please run the following command:

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar config-help -l java

UPDATE: On May 2018, about 50 top contributors and template creators of Swagger Codegen decided to fork Swagger Codegen to maintain a community-driven version called OpenAPI Generator. Please refer to the Q&A for more information.

I would recommend Swagger Gradle Codegen, Generates Kotlin code and Retrofit interfaces, with RxJava2 for async calls, Moshi for serialization and ThreeTenABP for Data management