java ee - Why use a parent pom file when generating an ear file? -

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i read question on - how add war inside ear maven

in top voted answer "joelittlejohn" -

"now create parent module (with pom) , add war module , ear module it. make sure set parent of war , ear modules corrently. when run mvn package new parent, war file built war module , ear file (containing war) built ear module."

but why create parent pom ? why not created standard maven project single pom. single pom file contains dependencies & modules, generate .ear file 1 pom file ?

something : 

<plugin>     <artifactid>maven-ear-plugin</artifactid>     <version>2.3.2</version>     <configuration>         <finalname>myearfile</finalname>         <version>5</version>         <generateddescriptorlocation>${basedir}/src/main/application/meta-inf</generateddescriptorlocation>         <modules>             <webmodule>                 <groupid>com.your.group.id</groupid>                 <artifactid>your-war-artifact</artifactid>                 <uri>youwarfile.war</uri>                 <bundlefilename>youwarfile.war</bundlefilename>                 <contextroot>/appname</contextroot>             </webmodule>         </modules>     </configuration>      <dependencies>     <dependency>     <groupid>com.your.group.id</groupid>     <artifactid>your-war-artifact</artifactid>     <version>your-war-version</version>     <type>war</type>     </dependency>     </dependencies>  </plugin>

it's typical in maven have module each war want build. , .ear file contain multiple wars. having module each provides nice separation of duties. parent pom wraps together.


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