Introduce general purpose Optional JSON serializer for GSON

In the current version GSON has no dedicated implementation for Optional
(more context given in [1]) type and uses reflection in order to
(de)serialize it. The problem is that newer versions of JDK (for
instance 17) no longer allow for JDK internal classes reflection access.
One option to solve it is to pass arg to VM ('--add-opens
java.base/java.util=ALL-UNNAMED') but that gets flaky as more tests are
written and option keeps getting propagated to more packages and what
is more it is not a solution for long term.

This change solves it by adding a general purpose Optional
(de)serializer that gets registered prior to the specific ones and
doesn't rely on reflection.

The (de)serialization of this adapter is exactly the same as the
reflective (de)serialization.

[1] https://github.com/google/gson/pull/2022

Release-Notes: Introduce non-reflection based Optional Type Adapter
Bug: Issue 15504
Change-Id: I64b553f2a8c14ce1c83fbac8edfeeb3e6aa2c2cf
3 files changed
tree: a93ca3ebbf5c3b3b7b5c9e17e6135595bfee89cf
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. WORKSPACE
  40. yarn.lock
README.md

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