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

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

Reproduce the issue with nowork.yaml using swagger-codegen generate --lang jaxrs --library jersey2 -i nowork.yaml, then inspect src/gen/java/io/swagger/api/GoApi.java. Trace the generated nested-list type handling that produces List<Double>.class; done means the generated Java is valid for the nested list schema.