Maven: Maven Assembly Plugin configuration with multiple modules in a maven project

In the parent pom.xml, add the configuration

<?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.test</groupId>
<artifactId>parent</artifactId>
<version>1.0</version>

<packaging>pom</packaging>

<name>Parent</name>

<modules>
<module>child1</module>
<module>child2</module>
<module>child3</module>
</modules>

<build>
<finalName>final-package-name</finalName>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<descriptors>
<descriptor>assembly.xml</descriptor>
</descriptors>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
</plugin>
</plugins>
</build>
</project>

The assembly.xml configuration content

<assembly>
<id>workflow</id>
<formats>
<format>zip</format> <!--The type of package which you want-->
</formats>

<fileSets>
<fileSet>
<directory>config</directory>
</fileSet>
</fileSets>

<!-- <includeBaseDirectory>false</includeBaseDirectory> -->
<moduleSets>
<moduleSet>
<includes>
<include>org.test:child1</include>
</includes>
<sources>
<includeModuleDirectory>false</includeModuleDirectory>
<fileSets>
<fileSet>
<directory>target</directory>
<outputDirectory>../lib</outputDirectory>
<includes>
<include>*.jar</include>
</includes>
</fileSet>
</fileSets>
</sources>
</moduleSet>

<moduleSet>
<includes>
<include>org.test:child2</include>
</includes>
<sources>
<fileSets>
<fileSet>
<outputDirectory>main</outputDirectory>
<directory>main</directory>
</fileSet>
<fileSet>
<directory>target
c128
</directory>
<outputDirectory>../lib</outputDirectory>
<includes>
<include>*.jar</include>
</includes>
</fileSet>
</fileSets>
</sources>
</moduleSet>
</moduleSets>
</assembly>

In order to generate your package, just run

1) mvn clean
2) assembly:assembly