swagger-api/swagger-codegen

[java][jaxrs] codegen fails on nested lists trys to put generic in class name

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#5,327 opened on Apr 4, 2017

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Issue: BugServer: Javahelp wanted

Description

Description

output code for list of list of double includes invalid java List<Double>.class Note that a list of doubles is generated correctly but a list of list of doubles is not.

Swagger-codegen version

2.2.2

Swagger declaration file content or url
swagger: '2.0'

info:
  title: example
  version: "0"

paths:
  /go:
    get:
      responses:
        200:
          description: "success"
          schema:
            type: array
            items: 
              type: array
              items:
                type: number
                format: double

this outputs invalid java to src/gen/java/io/swagger/api/GoApi.java

Command line used for generation

swagger-codegen generate --lang jaxrs --library jersey2 -i nowork.yaml

Steps to reproduce

create a file called nowork.yaml with the text given. run the command swagger-codegen generate --lang jaxrs --library jersey2 -i nowork.yaml from the directory containing nowork.yaml observe the generated file src/gen/java/io/swagger/api/GoApi.java it contains the bad java code List<Double>.class

Contributor guide

Tech stack
java
Domain
backendapi
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaJAX RSswagger codegen
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue is in swagger codegen's Java code generation for JAX RS with Jersey2 library. The bug occurs when generating code for nested arrays (array of arrays) of primitive types, producing invalid Java like `List<Double>.class`. Look at the template files for Java/JAX RS, likely in modules/swagger codegen/src/main/resources/JavaJaxRS/ or similar. The fix should handle nested generics correctly, perhaps by using a different type resolution for nested lists. The issue has no linked PRs, so investigation of the code generation logic for response types is needed.