Spring Improve nullability declarations for return types in [NamedParameter]JdbcOperations

JdbcOperations.query(String, ResultSetExtractor<T>) is currently declared as @Nullable. Tweaking the declaration to:

<T extends @Nullable Object> T query(String sql, ResultSetExtractor<T> rse) throws DataAccessException;

would allow the tooling to deduce the nullability of T from the RSE handed into the method.

Comment From: sbrannen

Although the proposed change is supported by JSpecify, it is not yet supported by NullAway.

We have therefore decided to postpone making such changes until the next 7.0 milestone or release candidate.