#23560 Correct imports for RxJava2 and RxJava3. Add support for Vert.x 5.

[sjw2547]

The mustache template for rxApiImpl, when working with Rx Java 2 and 3, imports rx.Single. This class is relocated with Rx Java 2 and 3, import has been corrected for those versions, along with using SingleHelper instead of Single.create()

For Vert.x 5 the generated ApiClient does not compile because the deprecated methods in Vert.x 4 that take a handler as a final parameter have been removed, returning a furutre instead. Added a new command line option called useVertx5 to call the replacement methods instead.

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Summary by cubic

Fixes incorrect RxJava imports in generated Vert.x Rx clients and adds Vert.x 5 support via a new useVertx5 option, so Java clients compile against Vert.x 5 while keeping Vert.x 4 compatibility. Adds a Vert.x 5 sample and minor whitespace cleanup.

• New Features

  • Added useVertx5 (--additional-properties useVertx5=true) to generate Vert.x 5 syntax in ApiClient (Future-based send, sendForm, file I/O, and sendBody); updated docs and added bin/configs/java-vertx5.yaml plus a new sample at samples/client/petstore/java/vertx5.
  • Default remains Vert.x 4: handler-based paths are used when useVertx5 is false.

• Bug Fixes

  • Corrected RxJava imports in rxApiImpl.mustache: use io.reactivex.Single/io.reactivex.rxjava3.core.Single and io.vertx.reactivex.SingleHelper/io.vertx.rxjava3.SingleHelper; replaced Single.create with SingleHelper.toSingle for RxJava2/3.
  • Removed unnecessary whitespace in generated ApiClient samples.

^{Written for commit 1a674d6. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

[wing328]

please follow step 3 to update samples and docs.

[sjw2547]

please follow step 3 to update samples and docs.

Done