問題背景

在使用GRPC插件protobuf的時(shí)候屁奏，complie編譯時(shí)出現(xiàn)以下錯(cuò)誤：
Could not find artifact com.google.protobuf:protoc:exe:${os.detected.classifier}:3.12.0 in central (https://repo.maven.apache.org/maven2)

解決方案

1 在pom文件的build標(biāo)簽添加，少了這個(gè)排除就會(huì)出現(xiàn)這樣的錯(cuò)誤

<extensions>
    <extension>
        <groupId>kr.motd.maven</groupId>
        <artifactId>os-maven-plugin</artifactId>
        <version>1.6.2</version>
    </extension>
</extensions>

2 GRPC整個(gè)pom文件，不要少了依賴，全部使用這個(gè)應(yīng)該是沒有問題的

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>a.b.c</groupId>
    <artifactId>grpc-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <grpc.version>1.34.1</grpc.version><!-- CURRENT_GRPC_VERSION -->
        <protobuf.version>3.12.0</protobuf.version>
        <protoc.version>3.12.0</protoc.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>io.grpc</groupId>
                <artifactId>grpc-bom</artifactId>
                <version>${grpc.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!--grpc和protobuf依賴-->
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty-shaded</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-protobuf</artifactId>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-stub</artifactId>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java-util</artifactId>
            <version>${protobuf.version}</version>
        </dependency>
    </dependencies>

    <build>
        <extensions>
            <extension>
                <groupId>kr.motd.maven</groupId>
                <artifactId>os-maven-plugin</artifactId>
                <version>1.6.2</version>
            </extension>
        </extensions>

        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
            <plugin>
                <!--protobuf插件-->
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <version>0.6.1</version>
                <configuration>
                    <protocArtifact>com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}</protocArtifact>
                    <pluginId>grpc-java</pluginId>
                    <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
                    <!--proto文件存放的位置诱建，使用protobuf才能找到-->
                    <protoSourceRoot>src/main/resources/proto</protoSourceRoot>
                    <!--通過插件生成的協(xié)議代碼存放地址-->
                    <outputDirectory>${basedir}/src/main/java</outputDirectory>
                    <!--如果放在src下面寒亥，一定要false，不然你的代碼都沒了蝴韭，輸出放在resources就沒關(guān)系-->
                    <clearOutputDirectory>false</clearOutputDirectory>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>compile-custom</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

總結(jié)

• 依賴兼容是一個(gè)大問題，同樣的jar包熙侍，但是版本號(hào)不同榄鉴，里面的一些類和注解也有變化，導(dǎo)致不兼容

作為程序員第 33 篇文章蛉抓，每次寫一句歌詞記錄一下庆尘，看看人生有幾首歌的時(shí)間，wahahaha ...