问题描述：

maven架构的Java项目构建了多个module，然后module A依赖module B。由于maven A依赖的是module B 的jar，所以当module B 源码更新之后存在module A不能及时更新最新版module B的jar包的问题

解决思路：

maven整个生命周期的作用域都是针对自身pom所在的module，无法更新pom中的某个jar，所以只能依靠其它方式实现。这时想到当持续集成时可以通过设置多个打包步骤，先打包module B，然后打包module A，这样就能保证module A使用的B的jar包一直是最新的。同理，本地开发环境可以通过设置IDEA Run Configurations中的Before Launch来控制启动类执行前的操作，在这里先编译B，再编译A，可以使得每次运行的A都依赖了最新版的B。

一、项目结构

cbam-mobile
├── cbam-mobile-service -- 业务模块
└── cbam-mobile-web -- web模块

二、项目pom文件

cbam-mobile

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.cuai.cbam</groupId>
        <artifactId>cbam-parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <groupId>com.cuai.cbam</groupId>
    <artifactId>cbam-mobile</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>cbam-mobile</name>
    <description>Demo project for cbam mobile</description>
    <modules>
        <module>cbam-mobile-service</module>
        <module>cbam-mobile-web</module>
    </modules>
    <properties>
        <java.version>1.8</java.version>
    </properties>
      <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.cuai.cbam</groupId>
            <artifactId>cbam-common</artifactId>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!-- 指定jdk -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

cbam-mobile-service

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.cuai.cbam</groupId>
        <artifactId>cbam-mobile</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>com.cuai.cbam</groupId>
    <artifactId>cbam-mobile-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>cbam-mobile-service</name>
    <description>mobile service project for cbam parent</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.cuai.cbam</groupId>
            <artifactId>cbam-common</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--upms fegin 调用相关工具类-->
        <dependency>
            <groupId>com.cbam</groupId>
            <artifactId>cbam-upms-api</artifactId>
        </dependency>
    </dependencies>    
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.cuai.cbam.mobile.CbamMobileServiceApplication</mainClass>
                    <skip>true</skip>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

cbam-mobile-web

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.cuai.cbam</groupId>
        <artifactId>cbam-mobile</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>com.cuai.cbam</groupId>
    <artifactId>cbam-mobile-web</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cbam-mobile-web</name>
    <description>Demo project for cbam mobile web</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.cuai.cbam</groupId>
            <artifactId>cbam-common</artifactId>
        </dependency>
        <dependency>
            <groupId>com.cuai.cbam</groupId>
            <artifactId>cbam-mobile-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

三、IDEA配置

如下图，这里我配置了父project cbam-mobile 的install，这样就能保证每次cbam-mobile-web启动时能依赖到最新的cbam-mobile-service