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Avoid generating uncompilable response body in Spring's API template

Merged Administrator requested to merge github/fork/smasset/long-example-string into master

Created by: smasset

PR checklist

  • Read the contribution guidelines.
  • Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\. If contributing template-only or documentation-only changes which will change sample output, be sure to build the project first.
  • Filed the PR against the correct branch: master, 4.1.x, 5.0.x. Default: master.
  • Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

If definitions start to get complicated, example response bodies can exceed Java compiler's limit for constant strings.

This PR addresses this issue by introducing and using two new lambdas to remove any unnecessary whitespace and (if still needed) to split the constant string into smaller compilable parts using a StringBuilder to merge them back again.

Fixes #2186 (closed)