Heroku: managing different properties files in with maven - maven

Question

Maybe someone can help me. I have searched the web but haven't been able to find a solution yet.
I have a java application running on Heroku. I want to be able to have different properties files loaded for different Heroku instances (dev, test, prod), but I get java.io.FileNotFoundException. This is what I have in my pom.xml.
<profiles>
<profile>
<id>dev</id>
<activation>
<property>
<name>env.APP_ENVIRONMENT</name>
<value>dev</value>
</property>
</activation>
<properties>
<profile.name>dev</profile.name>
</properties>
</profile>
<profile>
<id>test</id>
<activation>
<property>
<name>env.APP_ENVIRONMENT</name>
<value>test</value>
</property>
</activation>
<properties>
<profile.name>test</profile.name>
</properties>
</profile>
<profile>
<id>prod</id>
<activation>
<property>
<name>env.APP_ENVIRONMENT</name>
<value>prod</value>
</property>
</activation>
<properties>
<profile.name>prod</profile.name>
</properties>
</profile>
</profiles>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.github.jsimone</groupId>
<artifactId>webapp-runner</artifactId>
<version>7.0.34.0</version>
<destFileName>webapp-runner.jar</destFileName>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/profiles/${profile.name}</directory>
<includes>
<include>*.xml</include>
<include>*.properties</include>
</includes>
</resource>
</resources>
</build>

Answer 1

How to customize the Maven build is described here:
https://devcenter.heroku.com/articles/using-a-custom-maven-settings-xml
You can create a settings file for each build type:
settings.xml <-- Default
settings-dev.xml
settings-test.xml
settings-prod.xml
A production build could then be performed as follows:
heroku config:set MAVEN_SETTINGS_PATH=settings-prod.xml
git push heroku master
Details
The Java buildpack supports a way to specify a custom Maven settings file.
By default it uses a settings file located in the build directory, this can be overridden by setting one of the following variables:
MAVEN_SETTINGS_PATH
MAVEN_SETTINGS_URL