LenoMinkus commented on issue #15365:
URL: https://github.com/apache/dubbo/issues/15365#issuecomment-3074196944
Title: Generated protobuf sources not picked up by Maven build
Body (English):
> **Summary**
> When using the current `dubbo-maven-plugin` to compile `.proto` files, the
generated Java sources are placed under
> `target/generated-sources/protobuf/java`, but Maven only scans the
standard `src/main/java` directory during `package`.
> As a result, the generated classes are not included in the final JAR
unless an extra step is taken.
> **Suggestion**
> 1. Extract `.proto` files into a dedicated Maven module.
> 2. Let the `dubbo-maven-plugin` generate sources in that module.
> 3. Consume the generated stubs from other modules via a normal Maven
dependency.
> **Fix**
> Add the following dependency and plugin so Maven automatically adds the
generated folder to the compile classpath:
```xml
<dependencies>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-rpc-triple</artifactId>
<version>${dubbo.version}</version>
</dependency>
<!-- protobuf core -->
<dependency>
<groupId>com.google.protobuf</groupId>
<artifactId>protobuf-java</artifactId>
<version>${protobuf.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-maven-plugin</artifactId>
<version>${dubbo.version}</version> <!-- 3.3.0及以上版本 -->
<configuration>
<!-- 参考下文可配置参数 -->
<outputDir>${project.build.directory}/generated-sources/protobuf/java</outputDir>
<protoSourceDir>${basedir}/src/main/proto</protoSourceDir>
<!--proto编译器组件-->
<!--protobuf-java的版本-->
<protocVersion>${protobuf.version}</protocVersion>
<!--代码生成类型 可填tri或者tri_reactor 服务定义-->
<dubboGenerateType>tri</dubboGenerateType>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<!-- 添加os-maven-plugin用于自动检测系统类型 -->
<dependencies>
<dependency>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.7.0</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.5.0</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals><goal>add-source</goal></goals>
<configuration>
<sources>
<!-- 与 dubbo-maven-plugin 的 outputDir 保持一致
-->
<source>${project.build.directory}/generated-sources/protobuf/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<!-- <plugin>-->
<!-- <groupId>org.xolstice.maven.plugins</groupId>-->
<!-- <artifactId>protobuf-maven-plugin</artifactId>-->
<!-- <version>0.6.1</version>-->
<!-- <configuration>-->
<!--
<protocArtifact>com.google.protobuf:protoc:3.19.4:exe:${os.detected.classifier}</protocArtifact>-->
<!-- <protocPlugins>-->
<!-- <protocPlugin>-->
<!-- <id>dubbo</id>-->
<!-- <groupId>org.apache.dubbo</groupId>-->
<!-- <artifactId>dubbo-compiler</artifactId>-->
<!-- <version>0.0.4.1-SNAPSHOT</version>-->
<!--
<mainClass>org.apache.dubbo.gen.tri.Dubbo3TripleGenerator</mainClass>-->
<!-- </protocPlugin>-->
<!-- </protocPlugins>-->
<!-- </configuration>-->
<!-- <executions>-->
<!-- <execution>-->
<!-- <goals>-->
<!-- <goal>compile</goal>-->
<!-- </goals>-->
<!-- </execution>-->
<!-- </executions>-->
<!-- </plugin>-->
</plugins>
</build>
> **Environment**
> - Dubbo version: 3.3.0
> - Maven: 3.9.x
> - JDK: 17
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