尝试一下:

<pluginRepository>
  <id>apache.snapshots</id>
  <name>Apache Snapshots</name>
  <url>http://people.apache.org/repo/m2-snapshot-repository</url>
  <releases>
    <enabled>false</enabled>
  </releases>
  <snapshots>
    <enabled>true</enabled>
  </snapshots>
</pluginRepository>

http://tomcat.apache.org/maven-plugin-2.0-SNAPSHOT /snapshot-test.html