The files and directory structures output into generated-sources by swagger-codegen-maven-plugin are unusable

Similar code generator plugins for SOAP, Thrift, WADL, etc. output the sources directly into /target/generated-sources/wsimport/. The contents of this directory is source code and package directories only; nothing else.

When swagger-codegen-maven-plugin is executed, it outputs a complete Maven project directory structure and build files into /target/generated-sources/swagger/. When Maven gets to the compile phase, the source files are not found and the build fails.

What gets generated by swagger-codegen-maven-plugin:

\---target
    +---generated-sources
    |   \---swagger
    |       |   build.gradle
    |       |   gradle.properties
    |       |   pom.xml
    |       |   README.md
    |       |   settings.gradle
    |       |
    |       \---src
    |           \---main
    |               |   AndroidManifest.xml
    |               |
    |               \---java
    |                   \---io
    |                       \---swagger
    |                           \---client
    |                               |   ApiClient.java
    |                               |   ApiException.java
    |                               |   Configuration.java
    |                               |   JSON.java
    |                               |   Pair.java
    |                               |   StringUtil.java
    |                               |
    |                               +---api
    |                               |       PetApi.java
    |                               |       StoreApi.java
    |                               |       UserApi.java
    |                               |
    |                               +---auth
    |                               |       ApiKeyAuth.java
    |                               |       Authentication.java
    |                               |       HttpBasicAuth.java
    |                               |       OAuth.java
    |                               |       OAuthFlow.java
    |                               |
    |                               \---model
    |                                       ApiResponse.java
    |                                       Category.java
    |                                       Order.java
    |                                       Pet.java
    |                                       Tag.java
    |                                       User.java

What it should be generating to be usable:

\---target
    +---generated-sources
    |   \---swagger
    |       \---io
    |           \---swagger
    |               \---client
    |                   |   ApiClient.java
    |                   |   ApiException.java
    |                   |   Configuration.java
    |                   |   JSON.java
    |                   |   Pair.java
    |                   |   StringUtil.java
    |                   |
    |                   +---api
    |                   |       PetApi.java
    |                   |       StoreApi.java
    |                   |       UserApi.java
    |                   |
    |                   +---auth
    |                   |       ApiKeyAuth.java
    |                   |       Authentication.java
    |                   |       HttpBasicAuth.java
    |                   |       OAuth.java
    |                   |       OAuthFlow.java
    |                   |
    |                   \---model
    |                           ApiResponse.java
    |                           Category.java
    |                           Order.java
    |                           Pet.java
    |                           Tag.java
    |                           User.java

When I move and delete files by hand I can get it to compile, package and run successfully.

IMO the swagger-codegen-maven-plugin is unusable in its current form.