我已经实现了一个自定义的maven mojo来对输入POM中提到的所有模块执行一些操作。当从命令行调用时，mojo会按预期工作，如：
mvn plugin_group_id:artifact_id:version:mojo_goal_name
但当我把它作为一个阶段的一部分并调用这个阶段时，它就不一样了，比如：
mvn phase_having_mojo_as_goal
在这种情况下，它不使用反应堆并忽略模块。
插件POM是：
<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.aaa.bbb.ccc</groupId>
<artifactId>test-maven-plugin</artifactId>
<packaging>maven-plugin</packaging>
<version>1.0.0-SNAPSHOT</version>
<name>release-maven-plugin</name>
<description>Test Plugin</description>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.eclipse.jgit/org.eclipse.jgit -->
<dependency>
<groupId>org.eclipse.jgit</groupId>
<artifactId>org.eclipse.jgit</artifactId>
<version>5.7.0.202003110725-r</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven.shared/maven-invoker -->
<dependency>
<groupId>org.apache.maven.shared</groupId>
<artifactId>maven-invoker</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven/maven-artifact -->
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-artifact</artifactId>
<version>3.6.3</version>
</dependency>
<dependency>
<groupId>org.eclipse.sisu</groupId>
<artifactId>org.eclipse.sisu.plexus</artifactId>
<version>0.3.3</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-testing</groupId>
<artifactId>maven-plugin-testing-harness</artifactId>
<version>3.3.0</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-container-default</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-annotations</artifactId>
<version>3.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-project</artifactId>
<version>2.2.1</version>
<exclusions>
<exclusion>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-container-default</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.twdata.maven</groupId>
<artifactId>mojo-executor</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-model</artifactId>
<version>3.2.5</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>jaxen</groupId>
<artifactId>jaxen</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-compat</artifactId>
<version>3.2.5</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<version>3.2.5</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-aether-provider</artifactId>
<version>3.2.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.2.5</version>
</dependency>
<dependency>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-utils</artifactId>
<version>3.0.15</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
当您在聚合器上运行目标或阶段时，它会在每个模块上运行。
对于独立目标，这意味着目标只在每个模块上运行。
对于阶段，这意味着该阶段在每个模块上运行。该阶段是否包含插件定义则完全不同。
阶段的运行发生在每个模块上，但只有聚合器具有该阶段的插件定义，其他模块没有该定义。
如果你把插件定义放在每个模块或它们的父POM中，你会发现它是有效的。