This PR makes it possible to build the Nomulus code base using Java 17.
Building with Java 11 continue to be possible and the resulting bytecodes are
still at Java 8 level. Also upgraded Gradle to 8.5.
There are several necessary changes to make this happen:
1. Some Gradle plugins need to be upgraded to support Java 17, notably
errorprone. As a result, a lot more "errors" were caught and corrected.
2. All test code are now built and run at Java 8 level. Previously it was left
undefined (which defaults to the version of the compiler) and had led to
situations where we inadvertently called Java 8+ features in production that
are not caught by tests. The change also made the java8compatibility subproject
obsolete, which is therefore removed.
3. Removed the docs subproject. Its main use is to generate flows.md, but it
relies heavily on Java internal APIs that have changed significant with each
version. Upgrading to Java 11 required extensive refactoring of the code there,
and Java 17 again removed many APIs that were used. I don't think it is worth
the maintenance effort just to have a tool to generate flows.md which no one
actually reads.
4. Capped a few GCP dependencies because the latest version depends on
grpc-java >= 1.59.0, which includes a runtime incompatibility
(https://github.com/grpc/grpc-java/releases/tag/v1.59.0).
This PR turns out to be more massive than I would have liked but it
deals with all billing event related stuff, which are more or link all
intertwined:
* Remove all billing events as Ofy entities.
* Add a temporary annotation to allow BillingEvent's ID to be
auto-allocated by ofy while not lacking the Ofy @Id annotation.
* Remove Modification, which is only used in ofy.
* Remove BillingVKey, as we do not need to store the ofy key parent
information anymore. The VKey for a billing event now just contain
its primary key, and can be converted by VKeyConverter.
* Remove BigQuery related code in the billing pipeline.
Note that after BillingVKey is removed, several columns in
BillingCancellation are no longer needed. The change to database schema
will be handled in https://github.com/google/nomulus/pull/1721 after
this PR is deployed to production.
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* Resurrect symmetric vkeys when possible.
AbstractVKeyConverter had never been updated to generate symmetric VKeys for
simple (i.e. non-composite) VKey types. Update it to default to generating a
VKey with a simple Ofy key.
With this change, composite VKeys must specify the "compositeKey = true" field
in the With*VKey annotations. Doing so creates an asymmetric (SQL only) VKey
that can triggers higher-level logic to generate a corrected VKey containing
the composite Key.
