maven打包多模块项目，打包出来的 jar 只有一个模块
本帖最后由 ing 于 2020-9-7 21:55 编辑执行 mvn clean package 打包多模块项目，打包出来的 jar 只有module-a模块
根目录multiple的pom.xml
```
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mutiple-project</groupId>
<artifactId>multiple</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>build</name>
<url>http://maven.apache.org</url>
<modules>
<module>parent</module>
<module>moudle-a</module>
<module>module-b</module>
</modules>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
```
parent 模块
```
<?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>
<parent>
<artifactId>multiple</artifactId>
<groupId>mutiple-project</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>parent</artifactId>
<groupId>mutiple-project</groupId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>parent</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>14</maven.compiler.source>
<maven.compiler.target>14</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
```
module-a 模块依赖于 module-b
```
<?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>
<parent>
<groupId>mutiple-project</groupId>
<artifactId>parent</artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../parent/pom.xml</relativePath>
</parent>
<artifactId>moudle-a</artifactId>
<version>1.0-SNAPSHOT</version>
<name>moudle-a</name>
<packaging>jar</packaging>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>14</maven.compiler.source>
<maven.compiler.target>14</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>mutiple-project</groupId>
<artifactId>module-b</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- 插件配置同 paretn 模块 -->
</pluginManagement>
</build>
</project>
```
module-b
```
<?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>
<parent>
<artifactId>parent</artifactId>
<groupId>mutiple-project</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../parent/pom.xml</relativePath>
</parent>
<artifactId>module-b</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>module-b</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>14</maven.compiler.source>
<maven.compiler.target>14</maven.compiler.target>
</properties>
<dependencies>
</dependencies>
<build>
<pluginManagement><!-- 插件配置同 paretn 模块 -->
</pluginManagement>
</build>
</project>
```
一般这种情况我是先clean父模块，然后install或者package，然后在对子模块clean，再进行install或者package。中间看日志是否报错。一般就这几步 把源码发上来帮你调试一下 父模块的父模块，不知道maven有没有这种多层继承机制。那个multiple没有什么可继承的，它应该是个聚合模块，聚合模块的特点是：子模块不知道它的存在。所以应该在parent模块中去掉对multiple的引用。还有一种常用的做法是去掉parent模块，直接把multiple配置为 聚合模块+父模块。另外你的包名和groupid不符，不知道会不会有问题，但是这样写有点反常规。
页:
[1]