yuicompressor maven plugin and maven-war-plugin

OK. I finally figured this out. You need to define a <webappDirectory> in the yuicompressor plugin that can then be referenced as a <resource> in the maven-war-plugin. In the example below I'm using <directory>${project.build.directory}/min</directory>

<plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>yuicompressor-maven-plugin</artifactId>
    <version>1.3.0</version>
    <executions>
        <execution>
            <id>compressyui</id>
            <phase>process-resources</phase>
            <goals>
                <goal>compress</goal>
            </goals>
            <configuration>
                <nosuffix>true</nosuffix>
                <warSourceDirectory>${basedir}/WebContent</warSourceDirectory>
                <webappDirectory>${project.build.directory}/min</webappDirectory>
                <jswarn>false</jswarn>
            </configuration>
        </execution>
    </executions>
</plugin>
<plugin>
    <artifactId>maven-war-plugin</artifactId>
    <executions>
        <execution>
            <id>default-war</id>
            <phase>package</phase>
            <goals>
                <goal>war</goal>
            </goals>
            <configuration>
                <warSourceDirectory>${basedir}/WebContent</warSourceDirectory>
                <encoding>UTF-8</encoding>
            </configuration>
        </execution>
    </executions>
    <configuration>
        <warSourceDirectory>${basedir}/WebContent</warSourceDirectory>
        <encoding>UTF-8</encoding>
        <webResources>
            <resource>
                <directory>${project.build.directory}/min</directory>
            </resource>
        </webResources>
    </configuration>
</plugin>

I would like to add the configuration which worked for me:

First, to fix m2e complaining about the 'Plugin execution not covered by lifecycle' I added the following in the parent pom taken from this post:

  <pluginManagement>
    <plugins>
        <!--This plugin's configuration is used to store Eclipse 
            m2e settings only. It has no influence on the Maven build itself. -->
        <plugin>
            <groupId>org.eclipse.m2e</groupId>
            <artifactId>lifecycle-mapping</artifactId>
            <version>1.0.0</version>
            <configuration>
                <lifecycleMappingMetadata>
                    <pluginExecutions>
                        <pluginExecution>
                            <pluginExecutionFilter>
                                <groupId>net.alchim31.maven</groupId>                               
                                <artifactId>yuicompressor-maven-plugin</artifactId>
                                <versionRange>[1.0.0,)</versionRange>
                                <goals>
                                    <goal>compress</goal>
                                </goals>
                            </pluginExecutionFilter>
                            <action>
                                <execute />
                            </action>
                        </pluginExecution>
                    </pluginExecutions>
                </lifecycleMappingMetadata>
            </configuration>
        </plugin>
    </plugins>
</pluginManagement>

Then in the war pom I put:

<build>
    <plugins>
        <plugin>
        <groupId>net.alchim31.maven</groupId>
        <artifactId>yuicompressor-maven-plugin</artifactId>
        <version>1.4.0</version>
        <executions>
        <execution>
            <goals>
              <goal>compress</goal>
            </goals>
            <configuration>
               <linebreakpos>300</linebreakpos>
               <excludes>
                 <exclude>**/*-min.js</exclude>
                 <exclude>**/*.min.js</exclude>
                 <exclude>**/*-min.css</exclude>
                 <exclude>**/*.min.css</exclude>
               </excludes>              
               <nosuffix>true</nosuffix>
            </configuration>
        </execution>
        </executions>
        </plugin>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <warSourceExcludes>**/*.css,**/*.js</warSourceExcludes>
            </configuration>
        </plugin>
    </plugins>
</build>

This generates the minified css and js files in the project build target directory while excluding the original files.

I hope this saves someone time.

Just configure 'warSourceExcludes' on the WAR plugin.

<plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.4</version>
    <configuration>
        <warSourceExcludes>**/*.css,**/*.js</warSourceExcludes>
    </configuration>
</plugin>