[any] Excessive memory usage when generating examples

[tlxtellef]

Description

The json strings generated to populate the example list is done in an exhaustive manner, regardless of usage. If there are recursion or deep hierarchies of models the resulting JSON strings can get massive, leading to excessive memory usage.

With examples generated:

no examples generated:

Swagger-codegen version

Master branch at revision 955ec39

Swagger declaration url

https://tripletex.no/v2/swagger.json

Command line used for generation

generate -i https://tripletex.no/v2/swagger.json
--lang java
-c ./config.json
-o ./build/generated
-Dapis -DapiTests=false -DapiDocs=false
-Dmodels -DmodelTests=false -DmodelDocs=false
-DsupportingFiles

config.json being

{
  "library": "jersey2",
  "dateLibrary": "java8",
  "java8": true
}

Steps to reproduce

Generate the client and observe the memory usage.

Related issues/PRs

• Possibly OutOfMemoryError #6394

Suggest a fix/enhancement

Override DefaultCodegen#getExamples in all generatores that don't use examples at all.
Or make the example json generation be on demand instead of being generated upfront regardless of their usage.