maven 2 site plugin and attributes parameter

[Elliot Metsger]

I'm attempting to inject attributes into the site plugin like so in my pom:
                <configuration>
                        <attributes>
                            <foo>bar</foo>
                        </attributes>
                        <moduleExcludes>
                          <foo>bar</foo>
                        </moduleExcludes>
                        <template>site.vm</template>
                </configuration>
            </plugin>

Supposedly I'm allowed to do this according to the online documentation, and
according to the annotation on the attributes field of the
AbstractSiteRender class.

However, when running 'mvn -X site', the attributes do not show up:
[DEBUG] Configuring mojo
'org.apache.maven.plugins:maven-site-plugin:2.0-beta-5:site' -->
[DEBUG]   (f) generateReports = true
[DEBUG]   (f) generatedSiteDirectory =
/Users/esm/workspace/pluto11trunk/pluto-site/target/generated-site
[DEBUG]   (f) inputEncoding = ISO-8859-1
[DEBUG]   (f) localRepository = [local] -> file:///Users/esm/.m2/repository
[DEBUG]   (f) outputDirectory =
/Users/esm/workspace/pluto11trunk/pluto-site/target/site
[DEBUG]   (f) outputEncoding = ISO-8859-1
[DEBUG]   (f) project = [EMAIL PROTECTED]
[DEBUG]   (f) reactorProjects =
[EMAIL PROTECTED]
[DEBUG]   (f) reports =
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED],
[EMAIL PROTECTED]
[DEBUG]   (f) repositories = [[apache.snapshots] ->
http://people.apache.org/repo/m2-snapshot-repository, [central] ->
http://repo1.maven.org/maven2]
[DEBUG]   (f) siteDirectory =
/Users/esm/workspace/pluto11trunk/pluto-site/src/site
[DEBUG]   (f) template = site.vm
[DEBUG]   (f) templateDirectory =
/Users/esm/workspace/pluto11trunk/pluto-site/src/site
[DEBUG]   (f) xdocDirectory =
/Users/esm/workspace/pluto11trunk/pluto-site/xdocs
[DEBUG] -- end configuration --

I've added debugging to the AbstractSiteRenderingMojo, and indeed the
attributes Map is null, despite it being configured in the POM.  

I've discovered that if I change
    /**
     * @parameter expression="${attributes}"
     */
    protected Map attributes;

to (take away expression="${attributes}"):

    /**
     * @parameter
     */
    protected Map attributes;

and re-install the site plugin, my <configuration>/<attributes> element is
used.

Any ideas?  

Thanks,
Elliot
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