Maven site command fails

I'm trying to get maven site working, but I'm blocked on this error.

[INFO] Failed to resolve artifact.

Failed to resolve artifact, possibly due to a repository list that is not appropriately equipped for this artifact's metadata.

org.apache.maven.plugins:maven-pmd-plugin:pom:2.6-SNAPSHOT

from the specified remote repositories: sonar (http://son开发者_JAVA技巧ar:9000/deploy/maven),

central (http://repo1.maven.org/maven2),

risk-idi (http://nexus.yyy.com/nexus/content/groups/public-all)

I'm using maven 2.2.1 and maven site plugin version 2.2.

Any help will be appreciated.

I've found no maven-pmd-plugin-2.6-SNAPSHOT in the official maven repository (proof). You can try to specify its version explicitly:

<project>
  ...
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-pmd-plugin</artifactId>
        <version>2.5</version>
      </plugin>
    </plugins>
  </reporting>
  ...
</project>

Configuration is taken from here.