| tag | 390856efa9cbb1fba9e577624f8f3e272cadc111 | |
|---|---|---|
| tagger | Protobuf Team Bot <protobuf-team-bot@google.com> | Tue Sep 30 19:22:58 2025 -0700 |
| object | 3ce5838cff50734e28b51f880cfa5472539e6a8d |
Tag commit the v33-dev branch was cut at
| commit | 3ce5838cff50734e28b51f880cfa5472539e6a8d | [log] [tgz] |
|---|---|---|
| author | Protobuf Team Bot <protobuf-github-bot@google.com> | Tue Sep 30 14:39:48 2025 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Tue Sep 30 14:42:35 2025 -0700 |
| tree | b7fe08fa04ff1cffa72294771161bc563b7f2143 | |
| parent | 3d94d839b9117ad67eb57c949b37f824c91ac451 [diff] |
Change back to using String instead of Class as the argument on the Poison Pill. The reason to change this back is that one purpose of this method to provide a good message when e.g. someone tries to use 4.33.0 gencode against 4.30 runtime. The 4.30 runtime only has the `String` argument method, so by having new gencode try to call the `Class` one it will result in ABI behavior of a NoSuchMethodError instead of getting the clean message when that 'bad direction skew' happens. This partial-rollback tries to retain the benefit of avoiding the small cost of the .class.getName() call by having new gencode simply emit the name as a string literal like `"MyMessageProto"` instead of `MyMessageProto.class.getName()` when calling the poison pill. Because we didn't do any open source releases with this change quite yet, we can remove the `Class` overload here instead of it having to linger forever. PiperOrigin-RevId: 813433985
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Protocol Buffers (a.k.a., protobuf) are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data. You can learn more about it in protobuf's documentation.
This README file contains protobuf installation instructions. To install protobuf, you need to install the protocol compiler (used to compile .proto files) and the protobuf runtime for your chosen programming language.
Most users will find working from supported releases to be the easiest path.
If you choose to work from the head revision of the main branch your build will occasionally be broken by source-incompatible changes and insufficiently-tested (and therefore broken) behavior.
If you are using C++ or otherwise need to build protobuf from source as a part of your project, you should pin to a release commit on a release branch.
This is because even release branches can experience some instability in between release commits.
Protobuf supports Bzlmod with Bazel 7 +. Users should specify a dependency on protobuf in their MODULE.bazel file as follows.
bazel_dep(name = "protobuf", version = <VERSION>)
Users can optionally override the repo name, such as for compatibility with WORKSPACE.
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Note that with the release of 30.x there are a few more load statements to properly set up rules_java and rules_python.
http_archive(
name = "com_google_protobuf",
strip_prefix = "protobuf-VERSION",
sha256 = ...,
url = ...,
)
load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
protobuf_deps()
load("@rules_java//java:rules_java_deps.bzl", "rules_java_dependencies")
rules_java_dependencies()
load("@rules_java//java:repositories.bzl", "rules_java_toolchains")
rules_java_toolchains()
load("@rules_python//python:repositories.bzl", "py_repositories")
py_repositories()
The protobuf compiler is written in C++. If you are using C++, please follow the C++ Installation Instructions to install protoc along with the C++ runtime.
For non-C++ users, the simplest way to install the protocol compiler is to download a pre-built binary from our GitHub release page.
In the downloads section of each release, you can find pre-built binaries in zip packages: protoc-$VERSION-$PLATFORM.zip. It contains the protoc binary as well as a set of standard .proto files distributed along with protobuf.
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If you would like to build protoc binary from source, see the C++ Installation Instructions.
Protobuf supports several different programming languages. For each programming language, you can find instructions in the corresponding source directory about how to install protobuf runtime for that specific language:
| Language | Source |
|---|---|
| C++ (include C++ runtime and protoc) | src |
| Java | java |
| Python | python |
| Objective-C | objectivec |
| C# | csharp |
| Ruby | ruby |
| Go | protocolbuffers/protobuf-go |
| PHP | php |
| Dart | dart-lang/protobuf |
| JavaScript | protocolbuffers/protobuf-javascript |
The best way to learn how to use protobuf is to follow the tutorials in our developer guide.
If you want to learn from code examples, take a look at the examples in the examples directory.
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