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Eric Anderson eb391fd66c Bump to Gradle 7.6 and update plugins 
As normal, Android versions weren't touched as it tends to be special to
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The errorprone plugin handles errorproneJavac for us now, since it
hasn't changed in five years. VERSION_CATALOGS is already enabled by
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Fixes #9802
 		2023-01-11 08:17:17 -08:00
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BUILD.bazel bazel: Add compatibility for --incompatible_load_cc_rules_from_bzl 2019-10-16 13:29:19 -07:00
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README.md

gRPC Java Codegen Plugin for Protobuf Compiler

This generates the Java interfaces out of the service definition from a .proto file. It works with the Protobuf Compiler (protoc).

Normally you don't need to compile the codegen by yourself, since pre-compiled binaries for common platforms are available on Maven Central:

  1. Navigate to https://mvnrepository.com/artifact/io.grpc/protoc-gen-grpc-java
  2. Click into a version
  3. Click "Files"

However, if the pre-compiled binaries are not compatible with your system, you may want to build your own codegen.

Compiling and testing the codegen

Set up your system as described in COMPILING.md.

Then change to the compiler directory:

$ cd $GRPC_JAVA_ROOT/compiler

To compile the plugin:

$ ../gradlew java_pluginExecutable

To test the plugin with the compiler:

$ ../gradlew test

You will see a PASS if the test succeeds.

To compile a proto file and generate Java interfaces out of the service definitions:

$ protoc --plugin=protoc-gen-grpc-java=build/exe/java_plugin/protoc-gen-grpc-java \
  --grpc-java_out="$OUTPUT_FILE" --proto_path="$DIR_OF_PROTO_FILE" "$PROTO_FILE"

To generate Java interfaces with protobuf lite:

$ protoc --plugin=protoc-gen-grpc-java=build/exe/java_plugin/protoc-gen-grpc-java \
  --grpc-java_out=lite:"$OUTPUT_FILE" --proto_path="$DIR_OF_PROTO_FILE" "$PROTO_FILE"

Installing the codegen to Maven local repository

This will compile a codegen and put it under your ~/.m2/repository. This will make it available to any build tool that pulls codegens from Maven repositories.

$ ../gradlew publishToMavenLocal

Creating a release of gRPC Java

Please follow the instructions in RELEASING.md under the root directory for details on how to create a new release.