如何从模块的子模块创建Jar

Question

我有这个java maven项目结构

- parentModule
    - firstChildModule
    - firstChildModule
    - firstChildModule
        - secondChildModule -> **jar**
            - thirdChildModule
            - thirdChildModule
            - thirdChildModule

我想将secondChildModule模块封装为一个包含其子模块的jar。

我试图将包装类型设置为pom，但引发了一个异常，指出值为"jar"的"包装"无效。

所以我的问题是如何以正确的方式做到这一点？我提到只有thirdChildModule模块类型才会包含源代码。

以下是firstChildModule、secondChildModule和的来源

firstChildModule

<?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>parentModule</artifactId>
        <groupId>com.company</groupId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.company</groupId>
    <artifactId>firstChildModule</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>secondChildModule</module>
    </modules>
</project>

secondChildModule

<?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>
        <groupId>com.company</groupId>
        <artifactId>firstChildModule</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.company</groupId>
    <artifactId>secondChildModule</artifactId>
    <packaging>pom</packaging>
    <name>Second Child Module</name>
    <modules>
        <module>thirdChildModule01</module>
        <module>thirdChildModule02</module>
        <module>thirdChildModule0</module>
    </modules>
</project>

第三子模块

 <?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">
    <parent>
        <artifactId>secondChildModule</artifactId>
        <groupId>com.company</groupId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.company</groupId>
    <artifactId>thirdChildModule01</artifactId>
</project>

Answer 1

maven汇编插件可以满足您的需要。

https://maven.apache.org/plugins/maven-assembly-plugin/

在您的secondchildmodule pom.xml文件中按如下方式设置此插件。

...
<artifactId>secondchildmodule</artifactId>
<packaging>pom</packaging>
...
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>3.4.2</version>
            <configuration>
                <descriptors>
                    <descriptor>src/main/assembly/assembly.xml</descriptor>
                </descriptors>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

添加此程序集描述符以在src/main/assembly/assembly.xml 处设置输出

<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.1.1"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/2.1.1 http://maven.apache.org/xsd/assembly-2.1.1.xsd">
<id>fat-jar</id>
<formats>
    <format>jar</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<moduleSets>
    <moduleSet>
        <binaries />
    </moduleSet>
</moduleSets>

在secondchildmodule/目标生成的文件

jar-tf secondchildmodule--1.0-SNAPSHOT-fat-jar.jar

META-INF/
META-INF/MMANIFEST.MF
第三子模块1/
thirdchildmodule 1/Main.class
第三子模块2/
thirdchildmodule 2/Main.class
第三子模块3/
thirdchildmodule 3/Main.class
第三子模块3/另一个/
thirdchildmodule 3/other/pkg/
thirdchildmodule 3/other/pkg/AntherClass.class