Sourced from protobuf-java's releases.

Protobuf Release v3.16.3

Java

• Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
• Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
• Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
• Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
• Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
• This release addresses a Security Advisory for Java users

Protocol Buffers v3.16.1

Java

• Improve performance characteristics of UnknownFieldSet parsing (#9371)

Protocol Buffers v3.16.0

C++

• Fix compiler warnings issue found in conformance_test_runner #8189 (#8190)
• Fix MinGW-w64 build issues. (#8286)
• [Protoc] C++ Resolved an issue where NO_DESTROY and CONSTINIT are in incorrect order (#8296)
• Fix PROTOBUF_CONSTINIT macro redefinition (#8323)
• Delete StringPiecePod (#8353)
• Fix gcc error: comparison of unsigned expression in '>= 0' is always … (#8309)
• Fix cmake install on iOS (#8301)
• Create a CMake option to control whether or not RTTI is enabled (#8347)
• Fix endian.h location on FreeBSD (#8351)
• Refactor util::Status (#8354)
• Make util::Status more similar to absl::Status (#8405)
• Fix -Wsuggest-destructor-override for generated C++ proto classes. (#8408)
• Refactor StatusOr and StringPiece (#8406)
• Refactor uint128 (#8416)
• The ::pb namespace is no longer exposed due to conflicts.
• Allow MessageDifferencer::TreatAsSet() (and friends) to override previous calls instead of crashing.
• Reduce the size of generated proto headers for protos with string or bytes fields.
• Move arena() operation on uncommon path to out-of-line routine
• For iterator-pair function parameter types, take both iterators by value.
• Code-space savings and perhaps some modest performance improvements in RepeatedPtrField.
• Eliminate nullptr check from every tag parse.
• Remove unused _$name$cached_byte_size fields.
• Serialize extension ranges together when not broken by a proto field in the middle.
• Do out-of-line allocation and deallocation of string object in ArenaString.

... (truncated)

• b8c2488 Updating version.json and repo version numbers to: 16.3
• 42e47e5 Refactoring Java parsing (3.16.x) (#10668)
• 98884a8 Merge pull request #10556 from deannagarcia/3.16.x
• 450b648 Cherrypick ruby fixes for monterey
• b17bb39 Merge pull request #10548 from protocolbuffers/3.16.x-202209131829
• c18f5e7 Updating changelog
• 6f4e817 Updating version.json and repo version numbers to: 16.2
• a7d4e94 Merge pull request #10547 from deannagarcia/3.16.x
• 55815e4 Apply patch
• 152d7bf Update version.json with "lts": true (#10535)
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