Protocol Buffers Version 25.0 is Released!

[Josh Haberman]

This version includes the following non-breaking changes:

Compiler

• Implement proto2/proto3 with editions (3813b66)
• Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
• Add utf8_validation feature back to the global feature set. (153028d)
• Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
• Merge the protobuf and upb Bazel repos (7286ffc)
• Editions: Introduce functionality to protoc for generating edition feature set defaults. (4019e25)
• Editions: Migrate edition strings to enum in C++ code. (f083ebf)
• Create a reflection helper for ExtensionIdentifier. (4d5ab73)
• Editions: Provide an API for C++ generators to specify their features. (e897bcf)
• Editions: Refactor feature resolution to use an intermediate message. (57d8049)
• Publish extension declarations with declaration verifications. (e72b0e1)
• Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
• Editions: Migrate string_field_validation to a C++ feature (1f95830)
• Editions: Include defaults for any features in the generated pool. (15863ff)
• Protoc: parser rejects explicit use of map_entry option (#13479) (8f59292)
• Protoc: validate that reserved range start is before end (#13474) (3be00f7)
• Protoc: support identifiers as reserved names in addition to string literals (only in editions) (#13471) (e701f4f)
• Drop support for Bazel 5. (a80daa2)
• Allow code generators to specify whether or not they support editions. (2176a14)

C++

• Set PROTOBUF_EXPORT on InternalOutOfLineDeleteMessageLite() (#14434) (db89a51)
• Update stale checked-in files (#14431) (ada0be8)
• Apply PROTOBUF_NOINLINE to declarations of some functions that want it. (6e848b0)
• Implement proto2/proto3 with editions (3813b66)
• Make JSON UTF-8 boundary check inclusive of the largest possible UTF-8 character. (e80b8ec)
• Reduce Map::size_type to 32-bits. Protobuf containers can't have more than (95d2b2e)
• Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
• Fix bug in reflection based Swap of map fields. (bef5b75)
• Add utf8_validation feature back to the global feature set. (153028d)
• Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
• Add prefetching to arena allocations. (fbdeb5a)
• Merge the protobuf and upb Bazel repos (7286ffc)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated repeated and map field accessors. (9a0a3cf)
• Editions: Migrate edition strings to enum in C++ code. (f083ebf)
• Workaround ICE on gcc 7.5 by not having one overload call the other one with a (0522054)
• Create a reflection helper for ExtensionIdentifier. (4d5ab73)
• Editions: Provide an API for C++ generators to specify their features. (e897bcf)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated string field accessors. (18c338a)
• Editions: Refactor feature resolution to use an intermediate message. (57d8049)
• Fixes for 32-bit MSVC. (66cf6b1)
• Publish extension declarations with declaration verifications. (e72b0e1)
• Export the constants in protobuf's any.h to support DLL builds. (fd24b1b)
• Implement AbslStringify for the Descriptor family of types. (230232a)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated message field accessors. (064035c)
• Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
• Editions: Migrate string_field_validation to a C++ feature (1f95830)
• Editions: Include defaults for any features in the generated pool. (15863ff)
• Introduce C++ feature for UTF8 validation. (c7119e6)
• Protoc: validate that reserved range start is before end (#13474) (3be00f7)
• Remove option to disable the table-driven parser in protoc. (6d03f9b)
• Lock down ctype=CORD in proto file. (b359e50)
• Support split repeated fields. (5b5e5bf)
• In OSS mode omit some extern template specializations. We have seen reports of (ab96824)
• Automated rollback of commit adb2c4b. (0ea0052)
• Allow code generators to specify whether or not they support editions. (2176a14)
• Handle conflicting macros for FreeBSD (#13303) (2a95295)

Java

• Implement proto2/proto3 with editions (3813b66)
• Remove synthetic oneofs from Java gencode field accessor tables. (9ad2268)
• Timestamps.parse: Add error handling for invalid hours/minutes in the timezone offset. (8f85138)
• Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
• Automated rollback of commit 2a55706. (30b6251)
• Add missing debugging version info to Protobuf Java gencode when multiple files are generated. (301dfc5)
• Fix a bad cast in putBuilderIfAbsent when already present due to using the result of put() directly (which is null if it currently has no value) (785c82d)
• Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
• Fix a NPE in putBuilderIfAbsent due to using the result of put() directly (which is null if it currently has no value) (47cec39)
• Update Kotlin compiler to escape package names (#13310) (437ec35)
• Add MapFieldBuilder and change codegen to generate it and the put{field}BuilderIfAbsent method. (955d4ab)
• Introduce recursion limit in Java text format parsing (bca3bed)
• Consider the protobuf.Any invalid if typeUrl.split("/") returns an empty array. (004f54a)
• Mark FieldDescriptor.hasOptionalKeyword() as deprecated. (d6157f7)

Kotlin

• Add ByteString.isNotEmpty Kotlin extension function. (961779e)

Csharp

• Add C# deterministic serialization (#13160) (96100bf)
• Add .NET debugging attributes (#14097) (67b9c76)
• Improve .NET debugging of Protobuf messages (#13838) (e519c62)
• Lock down ctype=CORD in proto file. (b359e50)

Objective-C

• Merge the protobuf and upb Bazel repos (7286ffc)
• [ObjC] Flip the default for two generation options. (08bbb57)
• [ObjC] Enable generation of .proto files using editions. (55ab831)
• [ObjC] add "generate_minimal_imports" generation option (0b817d4)
• [ObjC] Add generation control for descriptor custom options. (bd9d689)
• Lock down ctype=CORD in proto file. (b359e50)

Rust

• Merge the protobuf and upb Bazel repos (7286ffc)

Python

• Fixed Python memory leak in map lookup. (1711ebd)
• Loosen upb for json name conflict check in proto2 between json name and field (41af1d5)
• Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
• Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
• Ensure Timestamp.ToDatetime(tz) has correct offset (f0c56f9)
• Do not check required field for upb python MergeFrom (1e0bc56)
• Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
• Merge the protobuf and upb Bazel repos (7286ffc)
• Comparing a proto message with an object of unknown returns NotImplemented (12d4f41)
• Emit slots in pyi output as a tuple rather than a list for --pyi_out. (4a4f615)
• Fix a bug that strips options from descriptor.proto in Python. (27d42c5)
• Raise warings for message.UnknownFields() usages and navigate to the new add (c988759)
• Add protobuf python keyword support in path for stub generator. Also added tests for (4cc258a)
• Add tuple support to set Struct (533fbbb)

Python C-Extension (Default)

• Comparing a proto message with an object of unknown returns NotImplemented (protocolbuffers/upb@243add4)
• See also UPB changes below, which may affect Python C-Extension (Default).

PHP

• Merge the protobuf and upb Bazel repos (7286ffc)

PHP C-Extension

• Bump minimum PHP to 8.0 (b4abcef)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

• Check that ffi-compiler loads before using it to define tasks. (#14538) (#14560) (0a5d6d4)
• Ruby FFI implementation (#13343) (c52d80c)

Ruby C-Extension

• Merge the protobuf and upb Bazel repos (7286ffc)
• Ruby: Fix object cache lookups on 32-bit platforms (#13494) (055c378)
• Ruby FFI implementation (#13343) (c52d80c)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Include .inc files directly instead of through a filegroup (#14575) (8defef5)
• Loosen upb for json name conflict check in proto2 between json name and field (41af1d5)
• Add utf8_validation feature back to the global feature set. (153028d)
• Do not check required field for upb python MergeFrom (1e0bc56)
• Merge the protobuf and upb Bazel repos (7286ffc)
• Cherry-pick recent changes from the upb repo (#13908) (b2e39c1)
• Added malloc_trim() calls to Python allocator so RSS will decrease when memory is freed (56e9f2b)
• Upb: fix a Python memory leak in ByteSize() (e45a6d5)
• Support ASAN detection on clang (#1424) (protocolbuffers/upb@1b0011d)
• Upb: bugfix for importing a proto3 enum from within a proto2 file (protocolbuffers/upb@b19edc5)
• Expose methods needed by Ruby FFI using UPB_API (#1391) (protocolbuffers/upb@01fed1c)
• Fix PyUpb_Message_MergeInternal segfault (#1338) (protocolbuffers/upb@cefa206)

Other

• Expose alias to protobuf_nowkt runtime (5b6c245)
• Update absl submodule and dep to latest 20230802.0 LTS (#13515) (e7bb34d)

You can view the release on GitHub.

If you experience any issues with the release, please file a bug or post on the Protocol Buffers forum.