Gradle protobuf 任务未从依赖项中获取定义答案

【问题标题】：Gradle protobuf task not picking up definitions from dependenciesGradle protobuf 任务未从依赖项中获取定义
【发布时间】：2020-03-06 20:40:30
【问题描述】：

我有两个 Gradle 子项目，它们基本上是哑 protobuf 容器。一个子项目需要从另一个导入定义，但我似乎无法弄清楚如何让 protobuf Gradle 插件正常工作（我对 Gradle 还很陌生）。

这是一个例子。

目录布局：

build.gradle
settings.gradle
gradle.properties
dependency/
|
 - build.gradle
 - src/main/proto/dependency.proto
 main/
|
 - build.gradle
 - src/main/proto/main.proto

build.gradle（顶级）

plugins {
  id "com.google.protobuf" version "0.8.12"
  id "java"
}

configure (allprojects) {
    apply plugin: 'java'
    apply plugin: 'com.google.protobuf'
}

settings.gradle

rootProject.name = 'sample'

include 'main'
include 'dependency'

gradle.properties

group=sample
version=0.1.0

依赖/build.gradle

protobuf {
    protoc {
        artifact = "com.google.protobuf:protoc:3.11.0"
    }
}

dependencies {
    compile 'com.google.protobuf:protobuf-java:3.11.4'
    compile 'com.google.protobuf:protobuf-java-util:3.11.4'
}

dependency/src/main/proto/dependency.proto

syntax = "proto3";

package dependency;

option java_package = "dependency";

message DependencyRequest {
        string foo = 1;
}

message DependencyResponse {
        string bar = 1;
}

main/build.gradle

protobuf {
    protoc {
        artifact = "com.google.protobuf:protoc:3.11.0"
    }
    plugins {
        grpc {
            artifact = 'io.grpc:protoc-gen-grpc-java:1.27.2'
        }
    }
    generateProtoTasks {
        all()*.plugins {
            grpc {}
        }
    }
}

dependencies {
    compile 'com.google.protobuf:protobuf-java:3.11.4'
    compile 'com.google.protobuf:protobuf-java-util:3.11.4'

    protobuf project(':dependency')
}

main/src/main/proto/main.proto

syntax = "proto3";

package main;

option java_package = "main";

import "dependency/dependency.proto";

service MainService {

    rpc CallDependency(DependencyRequest) returns (DependencyResponse) {}

}

当我尝试构建时，我收到此错误：

$ ./gradlew :main:compileJava
> Task :main:generateProto FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':main:generateProto'.
> protoc: stdout: . stderr: dependency/dependency.proto: File not found.
  main.proto:7:1: Import "dependency/dependency.proto" was not found or had errors.
  main.proto:11:24: "DependencyRequest" is not defined.
  main.proto:11:52: "DependencyResponse" is not defined.

我阅读了documentation for the plugin 和this answer，但我无法让它工作。知道为什么 protobuf 任务没有获取 dependency.proto 吗？

【问题讨论】：

标签： gradle protocol-buffers grpc grpc-java protobuf-java

【解决方案1】：

显然 protobuf 文件设置正确，但包名称不匹配导致 main.proto 无法找到 dependency.proto。我可以通过删除 protobuf 定义中的包名来完成这项工作。

如果以后有人遇到这个问题，请检查你的包名和导入以确保它们是正确的。

【讨论】：