Java: 0 Warnings for generated code

Description

Currently the generated Java files reference imports that are not used, resulting in compiler warnings.

e.g. for Java jaxrs-cxf Models:

import java.io.File; // Warning e.g. in Models
import io.swagger.model.HelloModel;

import java.io.InputStream; // Warning e.g. in Models
import java.io.OutputStream; // Warning e.g. in Models
import java.util.List; // Warning e.g. in Models
import java.util.Map; // Warning e.g. in Models
import javax.ws.rs.*;
import javax.ws.rs.core.Response; // Warning e.g. in Models

Swagger-codegen version

master

Suggest a fix/enhancement

The quick fix would be to use more generalized imports like :

import java.io.*;
import javax.ws.rs.*;
import javax.ws.rs.core.*;

Alternatively or supplementing this, we could use a routine to automatically cleanup the unused imports after generating the code?

Start by locating the Java jaxrs-cxf templates responsible for generated Models and inspecting how their imports are assembled. Compare the generated imports with the types each file uses, then determine how to verify the result through generation and Java compilation checks. Done means generated Java files no longer produce warnings for unused imports.