Protocol Buffers v28.0-rc3

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Introduce FieldDescriptor::cpp_string_type() API to replace direct ctype inspection which will be removed in the next breaking change (72b0b7a)

Java

• Binary compatibility shims for GeneratedMessageV3, SingleFieldBuilderV3, RepeatedFieldBuilderV3, and their nested classes to restore binary compatibility with <=v3.x.x generated code built against v3.x.x prior to v4.26.0 breaking release. (6bf01c5)

Objective-C

• [ObjC] Add api to add a field to another collection of unknown fields. (0790ab4)
• [ObjC] Fix GPBUnknownField/GPBUnknownFields copy. (b3b9888)
• [ObjC] Raise an exception for a nil message. (35bd2be)
• [ObjC] Deprecate GPBUnknownFieldSet and related apis. (9f6ee72)
• [ObjC] More tests around unknown to known failure cases. (e822dce)

Rust

• Add visibility for rust public aliases for '@protobuf//:protobuf_rust' (2cee142)

Python

• Raise warnings for deprecated python cpp extension GetDebugString(). (5fc5558)

Other

• Remove protobuf rust from BCR presubmits for now. (92552d3)

Protocol Buffers v28.0-rc2

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Java

• Remove unused pom.xml files. (aaf5f79)

Kotlin

• Remove unused pom.xml files. (aaf5f79)

Objective-C

• [ObjC] Support errors when merging unknown fields to a message. (c46340e)
• [ObjC] Add apis for removing things from GPBUnknownFields. (c5c9c89)
• [ObjC] Collect unknown fields as data (a6b3535)
• [ObjC] Internal helper for getting the unknown field data from a message (bf2d4e7)
• [ObjC] Update tests to use both unknown fields apis. (0832b52)
• [ObjC] Deprecate GPBTextFormatForUnknownFieldSet(). (d1b6f8c)
• [ObjC] Parsing helper and tests around unknown fields. (9b16ee4)
• [ObjC] Add test around enum unknown values. (fad7b78)
• [ObjC] Expose a helper for stream error. (cf7abf6)
• [ObjC] Support MessageSet with GPBUnknownFields. (ddf9b76)
• [ObjC] Update MessageSet Parsing. (5fa8cd9)
• [ObjC] Validate MessageSet expectations. (3aa491c)
• [ObjC] Improve parsing validations (ef4898f)

Python

• Remove service.py usages in builder (902a68a)
• Raise warnings for deprecated google/protobuf/reflection.py APIs. (38140ac)

Ruby

• [Ruby] Warn if assigning a "UTF-8" string with invalid UTF-8. (#17253) (fe9a53c)

Ruby C-Extension

• [Ruby] Warn if assigning a "UTF-8" string with invalid UTF-8. (#17253) (fe9a53c)

Other

• Set -ex in test_java.yml (6a7e215)
• Refactor java maven GHA test to use our generated jars. (671ef8b)
• Remove /utf-8 flag added in #14197 (440dc83)
• Downgrade CMake to 3.29 to workaround Abseil issue. (cd75dd5)

Protocol Buffers v27.3

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Revert workaround for std::mutex issues on github windows runners. (ba3e7d7)

C++

• Update staleness (b7ef2ca)
• Omit the _raw_default_instance_ declaration when using DLL linkage. (22d9a03)
• Refactor the way we turn on the optimization in StrongPointer. (a15c9c5)

Java

• Omit the _raw_default_instance_ declaration when using DLL linkage. (22d9a03)

PHP

PHP C-Extension

• Fix segmentation faults with enabled keep_descriptor_pool_after_request (#16993) (ca3b732)

Ruby

Ruby C-Extension

• [Ruby] Fix mismatched pointer type (#17240) (a1d4777)

Other

• Remove /utf-8 flag added in #14197 (e20cb7a)
• Downgrade CMake to 3.29 to workaround Abseil issue. (8a579c1)
• Upgrade macos-11 tests to macos-12 (aec8a76)
• Use explicit names of our large runners (4e3b4f0)
• Upgrade our C++ release tests to large runners. (fa2b2d6)

Protocol Buffers v25.4

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Java

• Check that size is non-negative when reading string or bytes in StreamDecoder. (165cf12)
• Add Automatic-Module-Name (#14562) (552ad31)

PHP

PHP C-Extension

• Regen stale files (367c7be)

Ruby

Ruby C-Extension

• Regen stale files (367c7be)

Other

• Drop 2.7 in linux test (#17524) (314fc8b)
• Fix targets (eb1fdd3)
• Update bazel to 6.3.2 (a5dadc3)
• Backport staleness changes to 25.x (c3b9b4f)
• Downgrade CMake to 3.29 to workaround Abseil issue. (bdb1f75)
• Upgrade macos-11 tests to macos-12 (27041af)
• Use explicit names of our large runners (c73d6c8)
• Upgrade our C++ release tests to large runners. (8ec9a43)
• Downgrade our sanitized builds to ubuntu-20. (892a2ce)
• Disable TSAN tests due to what appears to be a sanitizer bug (aa32865)
• Disable MacOS C++ Cmake test for now. (6b1c253)
• Update setup-php to 2.30.0 and re-enable macOS PHP 8.2 tests. (220a74b)
• Add back error message unconditionally (f60c624)
• Pin bazel 6 for 25.x (3b72455)
• Actually fail if staleness fail (8688825)

Protocol Buffers v28.0-rc1

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• UPB text encoder without using reflection for Rust (used for a message's Debug trait) that will print out field number to value entries instead of field name to value entries of a message like how it's expected for the usual text format using reflection. (f9dd9ce)
• Enable MessageLite::DebugString to use Message::DebugString where possible. (f810cc5)
• Always report plugin support errors from protoc. (986ef8d)
• Stop supporting EDITION_PROTO2 as an alias for EDITION_LEGACY. (35b3425)
• Rename DynamicCastToGenerated/DownCastToGenerated to (18da465)
• Mark deleted fields in descriptor.proto reserved (44c409d)
• Protoc: support inf, -inf, nan, and -nan in option values (#15017) (3c03e93)

C++

• Removed specific MSVC settings when installing (#17285) (770090e)
• Omit the _raw_default_instance_ declaration when using DLL linkage. (79c55cb)
• Enable MessageLite::DebugString to use Message::DebugString where possible. (f810cc5)
• Fix a bug in which proto code uses ctype instead of string_type internally. (dfbe987)
• Add an optimization that prevents an exponential number of comparisons on deeply (594a71f)
• Replace FindHelper() with BucketNumber() when only the bucket number is required. (8c7b1ec)
• Stop supporting EDITION_PROTO2 as an alias for EDITION_LEGACY. (35b3425)
• Rename DynamicCastToGenerated/DownCastToGenerated to (18da465)
• Prohibit using features in the same file they're defined in. (24b91a7)
• Implement new Debug API with redaction. (bb68eb2)
• Use bool HasHasbits(const FieldDescriptor*) instead of manual checks. (448e326)
• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c99cf4b)
• Put arena cleanup nodes on a separate chunked list instead of at the ends of arena blocks. (f70d90b)
• Fix validation checks of implicit presence. (d6c2833)
• Clarify map behaviors in editions. (0dbd99a)
• Protoc: support inf, -inf, nan, and -nan in option values (#15017) (3c03e93)

Java

• Add overload for LazyStringArrayList.add(String): boolean (761d49a)
• Hoist SmallSortedMap.getNumArrayEntries() outside loops over array entries (229c958)
• Omit the _raw_default_instance_ declaration when using DLL linkage. (79c55cb)
• Java: Deprecate newExtensionWriter. (7122ba1)
• Immutable java: Use new lower-allocation extension serialization APIs from gencode (4151486)
• Reserialize all unresolved features using java features from the generated pool in case of descriptors from the custom pool. (415a147)
• Fix delimited inheritance in all languages. (8beb970)
• Full java runtime: Avoid allocating ArrayList iterators when serializing UnknownFieldSet (fac847c)
• Move back deprecation of java utf8 feature to 2024. (bd7078d)
• Reparse unknown features using extension registry containing Java features. (68d9087)
• Remove field SmallSortedMap.maxArraySize (16e0a63)
• Delete unused method SmallSortedSet.getOverflowEntriesDescending (c05be32)
• Avoid allocating FieldSet iterator if FieldSet is empty (3ba7280)
• Lazily resolve features for proto2 and proto3 for compatibility with old open source gencode that does not invoke feature resolution from gencode static init. (11c27df)
• Implement new Debug API with redaction. (bb68eb2)
• Replace SmallSortedMap.EmptySet with equivalent Collections.emptySet() (c6e2778)
• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c99cf4b)
• Avoid allocating TreeMap in UnknownFieldSet.Builder.asMap (4b7c2d4)
• Avoid allocating iterator in TextFormat printing UnknownFieldSet (8c6e5b7)
• Add null to the list of reserved words. (510c143)
• Add UnknownFieldSet.isEmpty (c56bddd)
• Java full runtime: Avoid allocating when calling asMap on empty UnknownFieldSet (d0b016f)
• Return the default instance when parsing from an empty byte[]. (f597991)
• Deprecate building from source with Maven to be removed in 4.28.x. (4c8da99)
• Java full runtime: Avoid allocating iterator if UnknownFieldSet's TreeMap is empty (4f12891)
• Proto java full runtime: avoid allocating Integers accessing enum lists (cc79f77)
• Split bootstrapped java_features.proto to keep it from leaking out. (2257232)
• Java Proto lite: avoid boxing Integers accessing enum lists (fb054c8)
• In the Kotlin DSL, reference builder methods with property syntax. (e9c9970)
• Java Proto Lite: Serialize repeated enums without allocating (de6aba9)
• Avoid boxing when serializing primitive lists in CodedOutputStreamWriter (eaee04d)

Kotlin

• In the Kotlin DSL, reference builder methods with property syntax. (e9c9970)

Csharp

• Fix delimited inheritance in all languages. (8beb970)
• Handle groups in C# JsonParser (#16970) (092cc15)
• Introduce MessageDescriptor.IsMapType in C# reflection to make it easier to tell whether a given message was generated by protoc for a map field. (047fc7673eb2a7373f7ad8f5b0...

Protocol Buffers v27.2

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Avoid calling absl::InitializeLog in protoc with MSVC (aa7fcb3)

C++

• Fix string_type bugs in edition 2023 (#17211) (4923b8d)
• Add simple conformance test that builds the old gencode against the current runtime. (9cfb59b)
• Make the underlying type of the enum by 8-bits instead of using bitfields for (316f493)

Java

• Cleanup imports and comments in V3 stubs. (270ca66)
• Add stubs for GeneratedMessageV3, RepeatedFieldBuilderV3, SingleFieldBuilderV3 for compatibility with older <4.26.x gencode. (1e360a4)
• Fix checking unknown field set empty which wasn't exposed yet in 27.x (c7a006a)
• Reserialize all unresolved features using java features from the generated pool in case of descriptors from the custom pool. (2426a02)
• Reparse unknown features using extension registry containing Java features. (e5ddc45)
• Fix data race in crosslink. (3d71e22)
• Fix delimited inheritance in all languages. (c4f359e)

Csharp

• Regenerate stale files (29f1b52)
• Fix delimited inheritance in all languages. (c4f359e)

Python

• Fix delimited inheritance in all languages. (c4f359e)

PHP

PHP C-Extension

• Regenerate stale files (29f1b52)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

Ruby C-Extension

• Regenerate stale files (29f1b52)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Fix delimited inheritance in all languages. (c4f359e)

Other

• Port windows bootstrapping fix (#17225) (19bd211)

Protocol Buffers v27.1

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Always report plugin support errors from protoc. (9a37881)

C++

• Fix a bug in edition defaults calculation. (887e95d)

Java

• Move back deprecation of java utf8 feature to 2024. (8ffc1d0)

Csharp

• Handle groups in C# JsonParser (#16970) (0e9dd4c)

Other

• Avoid ODR violations from bootstrapped protos (f61d89c)

Protocol Buffers v27.0

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Future-proof edition 2023 against feature value support windows. (fea6847)
• Mark deleted fields in descriptor.proto reserved (d2da463)
• Add extension declarations for known features. (f8d0a5b)
• Refactored the Java generator into separate packages and targets. (bd81fd9)
• Officially release Editions in 27.0. (baa83b6)
• Define lifetimes of edition 2023 features (77f62de)
• Implement feature lifetime validation in protoc and the C++ runtime. (b3b4497)
• Add edition lifetime options for feature specs. (b09b3e4)
• Enable editions support for Java Lite. (500c953)
• Release edition defaults CLI arguments. (7a0e10e)
• Update protoc release to include editions language features protos for Java and C++ (6483c47)

C++

• Future-proof edition 2023 against feature value support windows. (fea6847)
• Prohibit using features in the same file they're defined in. (8c5f3a7)
• Fix validation checks of implicit presence. (bdf6b10)
• Clarify map behaviors in editions. (61c9187)
• Ensure we allocate overaligned types with aligned operator new. (11ef0ff)
• Fix text-format delimited field handling.(29c69ff)
• In debug mode, after clearing oneof messages on arenas, poison them if ASAN. (8826baf)
• Allow string_type for Edition 2023. (d8251eb)
• Breaking change: Ensure we allocate overaligned types with aligned operator new. (11ef0ff)
• Python JSON parser: Ignore invalid enum string values if ignore_unknown_fields is set (#15887) (86abf35)
• Move java_features.proto to java/core/srce/main/resources (274bc7f)
• Add an RAII namespace printer helper for C++ codegen. (8599ab5)
• Enable editions support for Java Lite. (500c953)
• Add an RAII ifndef helper for C++ codegen. (1087274)
• Clear oneof message fields even on arena on non-OPT builds. (5c183bd)
• Implement edition 2023 support in all Ruby runtimes. (bca8fb6)
• Release edition defaults CLI arguments. (7a0e10e)
• Deprecate Arena::CreateMessage for OSS. (d4bfe52)
• Open sourcing reflection_visit_fieds. (cfc07df)
• Fixed the use of c++ keywords within namespace names (#15954) (988194a)
• Fix pkg-config metadata for shared abseil on windows (#15888) (fe6edca)
• Add GetStringView() and GetRepeatedStringView() with scratch. (a3f5af0)
• Avoid a 'may be used uninitialized' warning when built with '-c opt'. (#15846) (eb70b34)
• Add software prefetch to ByteSizeLong (948ca2e)
• Add prefetching in arena blocks. (9e57b8e)
• Rename the includingDefaultValueWithoutPresenceFields and always_print_without_presence_fields to alwaysPrintFieldsWithNoPresence in the C++, Py and Java JSON serializers for consistency. (7d43131)
• Remove tags for arena cleanup nodes now that we have dedicated string cleanup blocks. (202b106)
• Avoid unused-parameter warning in field accessor listeners. (f4d5c2c)
• Add new always_print_without_presence_fields option to the C++ JSON serializer. (671b61b)
• Fail to build descriptor if ctype is specified for non string/bytes fields (8b4c7a1)
• Check ctype() in DescriptorBuilder for edition 2023 and beyond. (307aeac)
• Fail building descriptors if ctype is used for fields other than string or bytes. (403e207)
• Fix generation of HasExtension and ExtensionSize functions to restrict to the (9f5be07)
• Add the privacy manifest to the C++ CocoaPod. (982ea24)

Java

• Lazily resolve features for proto2 and proto3 for compatibility with old open source gencode that does not invoke feature resolution from gencode static init. (#16907) (4483c6b)
• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c18cb95)
• Deprecate building from source with Maven to be removed in 4.28.x. (51b48a4)
• Split bootstrapped java_features.proto to keep it from leaking out. (d56cb7d)
• Refactored the Java generator into separate packages and targets. (bd81fd9)
• Define lifetimes of edition 2023 features (77f62de)
• Check that size is non-negative when reading string or bytes in StreamDecoder. (a94f57b)
• Fix text-format delimited field handling (29c69ff)
• Move java_features.proto to java/core/srce/main/resources (274bc7f)
• Add java_features.proto to kotlin_mvn release (369732a)
• Enable editions support for Java Lite. (500c953)
• Fix descriptor to access type via getType() s.t. messages using delimited encoding are consistently treated as groups for Java lite. (9f001a9)
• Make UnsafeByteOperations stable; removing experimental annotation. (0070ac1)
• Fix features inheritance of oneof fields and extensions and fix/move unit tests to actually run. (eb10ebd)
• Add software prefetch to ByteSizeLong (948ca2e)
• Rename the includingDefaultValueWithoutPresenceFields and `always_print_wi...

Protocol Buffers v27.0-rc3

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Add extension declarations for known features. (f8d0a5b)

Java

• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c18cb95)

Python

• Add temporary alias for system_python.bzl at previous location . (#16787) (ffd753f)

Other

• Work around windows path length limitations by moving immutable -> full in open source (new generator paths) and shortening long file names. (#16825) (615e704)

Protocol Buffers v27.0-rc2

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• Refactored the Java generator into separate packages and targets. (bd81fd9)

C++

• Fix validation checks of implicit presence. (bdf6b10)
• Clarify map behaviors in editions. (61c9187)

Java

• Deprecate building from source with Maven to be removed in 4.28.x. (51b48a4)
• Split bootstrapped java_features.proto to keep it from leaking out. (d56cb7d)
• Refactored the Java generator into separate packages and targets. (bd81fd9)

Other

• Move the windows path length workarounds out of protobuf-ci (9d715cb)
• Update src/file_lists.cmake for staleness (cd337dd)
• Add system_python to protobuf_deps.bzl. (65ee123)
• Migrate bazel tests to protobuf-ci. (1ee203b)
• Fix bazel cache issues in 7.0.0 (16acf7e)