I'm currently using maven3 with https://maven.apache.org/plugins/maven-war-plugin/ and http://tomcat.apache.org/maven-plugin-2.0/ with http://mojo.codehaus.org/build-helper-maven-plugin/ to add additional sources next to src/main/java like src/mock/java
When running mvn tomcat7:run these additional classes but also the test resources are present. 
When bundling the WAR (via mvn package), these fake-resources are excluded.
That is fine in most cases because the war bundle is what we ship and is beeing deployed on prod server.
Problem 1: BUT: The "fake" classes are still entitled in the WAR build what is not clean for productive WARs.
But there is another usecase: Building a WAR file WITH these additional classes AND resources for deploying on a local dev server via Continuous Integration / Deployment (jenkins) That's seems to be tricky...
Problem 2: The current WAR has the fake classes but not the fake-resources ;/
Question: How to EXclude the fake classes in normal build but how to INCLUDE these sources and also the fake resources in WAR build?
here is what I do:
<testResources>
    <testResource>
        <directory>src/test/resources</directory>
    </testResource>
    <testResource>
        <directory>src/mock/resources</directory>
    </testResource>
</testResources>
…
… // plugins section
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>2.5</version>
    <executions>
        <execution>
            <id>copy-resources-after-test</id>
            <phase>prepare-package</phase>
            <goals>
                <goal>resources</goal>
            </goals>
        </execution>
    </executions>
</plugin>
<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>build-helper-maven-plugin</artifactId>
    <version>1.7</version>
    <executions>
        <execution>
            <id>add-source</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>add-source</goal>
            </goals>
            <configuration>
                <sources>
                    <source>${project.basedir}/src/main/java-fake</source>
                    <source>${project.basedir}/src/mock/java</source>
                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.2</version>
    <configuration>
    </configuration>
</plugin>
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