引用地址https://www.cnblogs.com/geekdc/p/10744903.html

一、問題描述：

　　項目分多個模塊，open-eureka注冊中心、open-provider服務提供者、open-common公共部分，provider依賴common。父pom使用spring-boot-maver-plugin插件，項目直接運行Main主類沒問題，但是install報common中的類找不到符號.

二、查找問題：

　　spring-boot-maven-plugin 打包跟普通的apache-maven-plugin打包不一致，前者打的jar 包是可以直接用java -jar  name.jar 來執行的，但是common模塊只是作為一個其他模塊的依賴來使用，並不需要有啟動類，也不需要執行。

三、解決辦法：

　3.1、刪除父pom中的spring-boot-maven-plugin插件依賴，父pom不需要<build>

parent.pom

<?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>com.starfast.open</groupId>
    <artifactId>starfast-open</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <modules>
        <module>open-eureka</module>
        <module>open-provider</module>
        <module>open-feign</module>
        <module>open-common</module>
    </modules>
    <packaging>pom</packaging>

    <name>starfast-open</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
        <witown.open.version>1.0-SNAPSHOT</witown.open.version>
        <open.common.version>0.0.1-SNAPSHOT</open.common.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>
    </dependencies>


    <dependencyManagement>
        <!--引入spring-cloud依賴-->
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>com.witown.app</groupId>
                <artifactId>open-sdk</artifactId>
                <version>${witown.open.version}</version>
            </dependency>

            <dependency>
                <groupId>com.starfast.open</groupId>
                <artifactId>open-common</artifactId>
                <version>${open.common.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>


</project>

　3.2、只在需要獨立運行的模塊，如provider模塊中加載spring-boot-maven-plugin插件依賴  

provider.pom

<?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">
    <parent>
        <artifactId>starfast-open</artifactId>
        <groupId>com.starfast.open</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>open-provider</artifactId>
    <name>open-provider</name>

    <dependencies>
        <!--common模塊-->
        <dependency>
            <groupId>com.starfast.open</groupId>
            <artifactId>open-common</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3.3、刪除不需要獨立運行的模塊中的spring-boot-maven-plugin插件依賴

common.pom

<?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">
    <parent>
        <artifactId>starfast-open</artifactId>
        <groupId>com.starfast.open</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>open-common</artifactId>
    <packaging>jar</packaging>
    <name>open-common</name>

    <dependencies>
        <!--web-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--redis-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!--開放平台-->
        <dependency>
            <groupId>com.witown.app</groupId>
            <artifactId>open-sdk</artifactId>
        </dependency>
        <!--監控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--單元測試-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

</project>

install結果：

順便吐槽，網上的垃圾文章真多，還好發現了該篇文章，

https://blog.csdn.net/SnailMann/article/details/81710461

多謝作者。

ps：實際操作中，我原來項目就是在parent中定義了build，並且在所依賴的本項目中的jar包中使用了build

1.去掉parent中的build

2.去掉所依賴的本項目中的模塊pom中的build部分（也解決了不需要發布的jar包，而只是被別的項目依賴的jar包，還需要寫main入口程序的無用代碼）

3.在需要發布的項目模塊中，添加build，並且格式為

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--fork : 如果沒有該項配置devtools不會起作用，即應用不會restart -->
                    <fork>true</fork>
                    <addResources>true</addResources><!--支持靜態文件熱部署 -->
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-deploy-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/webapp</directory>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>

    </build>

 

4.注意要把資源文件也用build打包