[Java] swagger-codegen-cli generates non-compiling Java files for enum in array

Description

When generating Java code from a Swagger file, the resulting Java code cannot be compiled before some (simple) hand editing. This is due to an enum being created using Integer, but the enum constructor being called with String.

The compiler error message is
java.lang.String cannot be converted to java.lang.Integer

Swagger-codegen version

I have tried 2.3.1, a snapshot of 2.4.0 from 2018-05-22 and master commit a4d6d7ba316232308e32ed4949e46f1bb3982d4a

Swagger declaration file content or url

JSON example at https://gist.github.com/JensCarlbergLiU/3bd3a37cb67c96f135ce1f30313f0fb0

Command line used for generation

java -jar swagger-codegen-cli.jar -i bug-swagger.json -l java

Steps to reproduce

java -jar swagger-codegen-cli.jar -i bug-swagger.json -l java
mvn compile

Related issues/PRs

I have searched for part of the error message: java.lang.String cannot be converted to java.lang.Integer

No hits, though.

Suggest a fix/enhancement

No sggestion beyond the obvious, sorry.

Start with the Swagger JSON example linked in the issue and reproduce generation using swagger-codegen-cli with the Java language, then run mvn compile on the generated project. Inspect the generated enum for the array case and compare its declared value type with the constructor argument. Done means the generated Java files compile without hand editing.