How do I get Maven 2 to build 2 separate WAR files

I don't think you can do this in one step (actually, I'm surprised that Maven doesn't complain about your setup and wonder which one is applied) and I'd suggest to use profiles and maybe filtering to manage this use case.

If your web.xml are really different, you could just put your maven-war-plugin configuration in two profiles. Or, better, you could merge them into something like this:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-war-plugin</artifactId>
  <version>2.1-beta-1</version>
  <configuration>
    <webXml>src/main/config/${env}/web.xml</webXml>
    <warName>cas-test</warName>
  </configuration>
</plugin>

And set the env property in two profiles to pick up the right web.xml at build time.

<profiles>
  <profile>
    <id>uat</id>
    <properties>
      <env>test</env>
    </properties>
  </profile>
  <profile>
    <id>prod</id>
    <properties>
      <env>prod</env>
    </properties>
  </profile>
</profiles>

If your web.xml are similar (i.e. if only values differ in them), you could define properties and their values in two profiles and use filtering to apply them. Something like this:

<profiles>
  <profile>
    <id>env-uat</id>
    <activation>
      <property>
        <name>env</name>
        <value>uat</value>
      </property>
    </activation>
    <properties>
      <key1>uat_value_key_1</key1>
      <keyN>uat_value_key_n</keyN>
    </properties>
  </profile>
  <profile>
    <id>env-prod</id>
    <activation>
      <property>
        <name>env</name>
        <value>prod</value>
      </property>
    </activation>  
    <properties>
      <key1>prod_value_key_1</key1>
      <keyN>prod_value_key_n</keyN>
    </properties>
  </profile>
</profiles>

Then activate one profile or the other by passing the env property on the command line, e.g.:

mvn -Denv=uat package

Another option would be to put the values into specific filters and pick up the right one at build time (like in this post).

There are really many options but as I said, I don't think you can do this without runngin the build twice.

More resources on profiles/filtering:

• Maven Book: Chapter 11. Build Profiles
• Maven Book: Chapter 15.3. Resource Filtering
• Introduction to Build Profiles
• Use an alternative Maven Profile during test phase
• maven profile filtering search on Google

You can tell the Maven Assembly plugin to simply generate two assemblies. You just write an assembly descriptor file for each output you wish to create and list them in the plugin config.

For example I'm using it to generate a WAR file and a TGZ file, but there's no reason you can't do two WARs in the same way. mvn package will then generate both files.

        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <descriptors>
                    <descriptor>src/main/assembly/assembly-war.xml</descriptor>
                    <descriptor>src/main/assembly/assembly-dist.xml</descriptor>
                </descriptors>
            </configuration>
            <executions>
                <execution>
                    <id>dist-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

I'd generally suggest to use profiles and run two dedicated builds. However, it should be possible to create any number of artifacts using the maven-assembly-plugin.