Java 如何从多模块 maven 项目构建一个可执行的 jar？
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How to build an executable jar from multi module maven project?
提问by Moses
I'm beginner with maven and do not understand many things. I can build simple executable jar, but how to build multimodule maven project into executable jar is magic for me. So, I have three projects. Parent:
我是 maven 的初学者，很多东西都不懂。我可以构建简单的可执行 jar，但是如何将多模块 Maven 项目构建为可执行 jar 对我来说很神奇。所以，我有三个项目。家长：
<?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>org.example</groupId>
<artifactId>Test</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>Main</module>
<module>Dep</module>
</modules>
</project>
And two child projects:
还有两个子项目：
<?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>Test</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Main</artifactId>
<dependencies>
<dependency>
<groupId>org.example</groupId>
<artifactId>Dep</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
and:
和：
<?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>Test</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Dep</artifactId>
</project>
Main module has Main class with main method(lol)
主模块有主类和主方法（笑）
public class Main {
public static void main(String[] args) {
Hello hello = new Hello();
System.out.println(hello.sayHello());
}
}
Class Hello is defined in the Dep module. What should I add into my poms to build executable jar with Main class from Main module as entry point?
类 Hello 在 Dep 模块中定义。我应该在我的 poms 中添加什么以使用 Main 模块中的 Main 类作为入口点构建可执行 jar？
采纳答案by stefaan dutry
You need to change your pom for artifactid Main. You need to add the maven-assembly-plugin
您需要为 artifactid Main 更改您的 pom。您需要添加 maven-assembly-plugin
In the configuration of it you have an option to specify the mainClass in the manifest. This should be the fully qualified name of the Main class.
在它的配置中，您可以选择在清单中指定 mainClass。这应该是 Main 类的完全限定名称。
<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>org.example</groupId>
<artifactId>Test</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>Main</artifactId>
<properties>
<!-- plugins -->
<maven.assembly.plugin.version>2.4</maven.assembly.plugin.version>
<!-- dependencies -->
<dep.version>1.0-SNAPSHOT</dep.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>${maven.assembly.plugin.version}</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>Main</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
<dependencies>
<dependency>
<groupId>org.example</groupId>
<artifactId>Dep</artifactId>
<version>${dep.version}</version>
</dependency>
</dependencies>
</project>
After you start your build on the parent project, it should create the executable jar in the target subfolder of the module Main. (a jar with the name Main-1.0-SNAPSHOT-jar-with-dependencies.jar was what i got)
在父项目上开始构建后，它应该在模块 Main 的目标子文件夹中创建可执行 jar。（一个名为 Main-1.0-SNAPSHOT-jar-with-dependencies.jar 的 jar 是我得到的）
