Java maven反应堆构建学习实践

实践环境

Apache Maven 3.0.5 (Red Hat 3.0.5-17)

应用示例

示例项目结构

maven示例项目组织结构如下

maven-study

│  pom.xml

│

├─first-sub-module

│  │  pom.xml

│  │

│  ├─src

│  │  ├─main

│  │  │  └─java

│  │  │      └─com

│  │  │          └─shouke

│  │  │              └─mvnstudy

│  │  │                      HelloMaven.java

│  │  │

│  │  └─test

│  │      └─java

│  │          └─com

│  │              └─shouke

│  │                  └─mvnstudy

│  │                          TestHelloMaven.java

│  │

│  └─sub-sub-module

│      │  pom.xml

│      │

│      └─src

│          ├─main

│          │  └─java

│          │      └─com

│          │          └─shouke

│          │              └─mvnstudy

│          │                      HelloMaven.java

│          │

│          └─test

│              └─java

│                  └─com

│                      └─shouke

│                          └─mvnstudy

│                                  TestHelloMaven.java

│

└─second-sub-module

    │  pom.xml

    │

    └─src

        ├─main

        │  └─java

        │      └─com

        │          └─shouke

        │              └─mvnstudy

        │                      HelloMaven.java

        │

        └─test

            └─java

                └─com

                    └─shouke

                        └─mvnstudy

                                TestHelloMaven.java

pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>parent-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <modules>

        <module>first-sub-module</module>

        <module>second-sub-module</module>

    </modules>

</project>

</xml>

first-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>first-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>com.shouke.mvnstudy</groupId>

            <artifactId>second-sub-module</artifactId>

            <version>1.0.0-SNAPSHOT</version>

        </dependency>

        <dependency>

            <groupId>com.shouke.mvnstudy</groupId>

            <artifactId>sub-sub-module</artifactId>

            <version>1.0.0-SNAPSHOT</version>

        </dependency>

    </dependencies>

    <parent>

        <groupId>com.shouke.mvnstudy</groupId>

        <!--父项目id-->

        <artifactId>parent-module</artifactId>

        <version>1.0.0-SNAPSHOT</version>

    </parent>

</project>

</xml>

first-sub-module/sub-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>sub-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

</project>

</xml>

second-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>second-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <parent>

        <groupId>com.shouke.mvnstudy</groupId>

        <!--父项目id-->

        <artifactId>parent-module</artifactId>

        <version>1.0.0-SNAPSHOT</version>

    </parent>

</project>

</xml>

学习实践

-pl选项应用

# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl first-sub-module  compile

[INFO] Scanning for projects...

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building first-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 0.219s

[INFO] Finished at: Fri Dec 24 11:20:23 CST 2021

[INFO] Final Memory: 17M/1447M

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal on project first-sub-module: Could not resolve dependencies for project com.shouke.mvnstudy:first-sub-module:jar:1.0.0-SNAPSHOT: Could not find artifact com.shouke.mvnstudy:second-sub-module:jar:1.0.0-SNAPSHOT -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

-am选项应用

# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl first-sub-module -am compile

[INFO] Scanning for projects...

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Build Order:

[INFO]

[INFO] parent-module

[INFO] second-sub-module

[INFO] first-sub-module

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building parent-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ parent-module ---

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building second-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ second-sub-module ---

[INFO] Deleting /root/maven-study/second-sub-module/target

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ second-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/second-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ second-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/second-sub-module/target/classes

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building first-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ first-sub-module ---

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ first-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/first-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ first-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/first-sub-module/target/classes

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary:

[INFO]

[INFO] parent-module ..................................... SUCCESS [0.146s]

[INFO] second-sub-module ................................. SUCCESS [0.576s]

[INFO] first-sub-module .................................. SUCCESS [0.346s]

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 1.187s

[INFO] Finished at: Fri Dec 24 11:22:06 CST 2021

[INFO] Final Memory: 22M/1096M

[INFO] ------------------------------------------------------------------------

-amd选项应用

对比示例

# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl second-sub-module compile

[INFO] Scanning for projects...

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building second-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ second-sub-module ---

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ second-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/second-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ second-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/second-sub-module/target/classes

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 0.976s

[INFO] Finished at: Fri Dec 24 11:21:18 CST 2021

[INFO] Final Memory: 23M/1447M

[INFO] ------------------------------------------------------------------------


# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl second-sub-module -am compile

[INFO] Scanning for projects...

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Build Order:

[INFO]

[INFO] parent-module

[INFO] second-sub-module

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building parent-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ parent-module ---

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building second-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ second-sub-module ---

[INFO] Deleting /root/maven-study/second-sub-module/target

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ second-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/second-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ second-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/second-sub-module/target/classes

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary:

[INFO]

[INFO] parent-module ..................................... SUCCESS [0.132s]

[INFO] second-sub-module ................................. SUCCESS [0.536s]

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 0.771s

[INFO] Finished at: Fri Dec 24 11:24:13 CST 2021

[INFO] Final Memory: 23M/1447M

[INFO] ------------------------------------------------------------------------

-amd应用示例

# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl second-sub-module -amd compile

[INFO] Scanning for projects...

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Build Order:

[INFO]

[INFO] second-sub-module

[INFO] first-sub-module

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building second-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ second-sub-module ---

[INFO] Deleting /root/maven-study/second-sub-module/target

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ second-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/second-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ second-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/second-sub-module/target/classes

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building first-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ first-sub-module ---

[INFO] Deleting /root/maven-study/first-sub-module/target

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ first-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/first-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ first-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/first-sub-module/target/classes

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary:

[INFO]

[INFO] second-sub-module ................................. SUCCESS [0.652s]

[INFO] first-sub-module .................................. SUCCESS [0.344s]

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 1.100s

[INFO] Finished at: Fri Dec 24 11:24:33 CST 2021

[INFO] Final Memory: 24M/1157M

[INFO] ------------------------------------------------------------------------

嵌套子模块构建

# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl first-sub-module/sub-sub-module compile

[INFO] Scanning for projects...

[ERROR] Could not find the selected project in the reactor: first-sub-module/sub-sub-module -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MavenExecutionException

修改first-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>first-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>com.shouke.mvnstudy</groupId>

            <artifactId>second-sub-module</artifactId>

            <version>1.0.0-SNAPSHOT</version>

        </dependency>

    </dependencies>

    <parent>

        <groupId>com.shouke.mvnstudy</groupId>

        <!--父项目id-->

        <artifactId>parent-module</artifactId>

        <version>1.0.0-SNAPSHOT</version>

    </parent>

    <modules>

        <module>sub-sub-module</module>

    </modules>

</project>

</xml>

修改first-sub-module/sub-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>sub-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <parent>

        <groupId>com.shouke.mvnstudy</groupId>

        <!--父项目id-->

        <artifactId>first-sub-module</artifactId>

        <version>1.0.0-SNAPSHOT</version>

    </parent>

</project>

</xml>


# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl first-sub-module/sub-sub-module -am compile

[INFO] Scanning for projects...

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Build Order:

[INFO]

[INFO] parent-module

[INFO] second-sub-module

[INFO] first-sub-module

[INFO] sub-sub-module

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building parent-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ parent-module ---

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building second-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ second-sub-module ---

[INFO] Deleting /root/maven-study/second-sub-module/target

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ second-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/second-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ second-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/second-sub-module/target/classes

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building first-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ first-sub-module ---

[INFO] Deleting /root/maven-study/first-sub-module/target

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building sub-sub-module 1.0.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ sub-sub-module ---

[INFO]

[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ sub-sub-module ---

[debug] execute contextualize

[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory /root/maven-study/first-sub-module/sub-sub-module/src/main/resources

[INFO]

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ sub-sub-module ---

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

[INFO] Compiling 1 source file to /root/maven-study/first-sub-module/sub-sub-module/target/classes

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary:

[INFO]

[INFO] parent-module ..................................... SUCCESS [0.148s]

[INFO] second-sub-module ................................. SUCCESS [0.728s]

[INFO] first-sub-module .................................. SUCCESS [0.005s]

[INFO] sub-sub-module .................................... SUCCESS [0.370s]

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 1.370s

[INFO] Finished at: Fri Dec 24 11:39:07 CST 2021

[INFO] Final Memory: 22M/1098M

[INFO] ------------------------------------------------------------------------
结论

注意-pl只适用在“父子”结构的项目中，构建子项目

针对以上结论，修改相关pom.xml，再次测试验证

修改pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>parent-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

</project>

</xml>

修改second-sub-module/pom.xml

<?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.shouke.mvnstudy</groupId>

    <artifactId>second-sub-module</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <dependencies>

        <!-- junit 依赖 -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.10</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

</project>

</xml>


# mvn clean -Dautoconfig.skip=true -Dmaven.test.skip=true -pl second-sub-module compile

[INFO] Scanning for projects...

[ERROR] Could not find the selected project in the reactor: second-sub-module -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MavenExecutionException

如上，提示找不到模块。

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