Using a variable in Maven from the super pom - maven

Question

I am giving myself a crash course in Maven and stumbled across a great plugin called buildnumber: http://www.mojohaus.org/buildnumber-maven-plugin/create-mojo.html
I have setup a VERY rudimentary, beginners project and in the pom.xml file I am successfully having the ${buildNumber} to interpolate.
I have the pom.xml below (I apologize for the length of it).
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>my-app</name>
<url>http://maven.apache.org</url>
<scm>
<connection>scm:git:ssh://git#bitbucket.org/XXXX/bb101repo.git</connection>
<developerConnection>scm:git:ssh://git#bitbucket.org/XXX/bb101repo.git</developerConnection>
<url>https://bitbucket.org/XXXX/bb101repo.git</url>
</scm>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>buildnumber-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>create</goal>
</goals>
</execution>
</executions>
<configuration>
<shortRevisionLength>5</shortRevisionLength>
<!-- doCheck : Check for locally modified files. If true build will fail if local modifications have not been commited -->
<!-- doUpdate : Update the local copy of your repo. If true the plugin will update your local files with the remote modifications before building -->
<doCheck>true</doCheck>
<doUpdate>false</doUpdate>
</configuration>
</plugin>
</plugins>
<finalName>${project.artifactId}-${project.version}-${buildNumber}</finalName>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
When I run mvn package, it works as intended.
I have another file in my project (under src) called info.xml and it's below.
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>FMS Help</display-name>
<version>${buildNumber}</version>
</web-app>
How do I get the ${buildNumber} to unpack in my tag under target?
I'm guessing it's a really simple solution, but I'm stumped. Again, I'm a complete n00b at Maven and any pointer in the right direction would be appreciated.
JW

Answer 1

You need to tell Maven to apply filtering to your resources. Check out the resources plugin documentation here:
http://maven.apache.org/plugins/maven-resources-plugin/examples/filter.html
To avoid applying filtering to all your source files, you'd either need to set up the proper include/exclude paths or move the info.xml file to the resources directory.