The Struts 2 Portlet Tutorial "mvn archetype:create -DarchetypeGroupId=org.apache.struts -DarchetypeArtifactId=struts2-archetype-portlet -DarchetypeVersion=2.1.1-SNAPSHOT -DartifactId=bookmark-portlet " Can't use

mvn archetype:create -DarchetypeGroupId=org.apache.struts -DarchetypeArtifactId=struts2-archetype-portlet -DarchetypeVersion=2.1.1-SNAPSHOT -DartifactId=bookmark-portlet
-DgroupId=com.mycompany -DremoteRepositories=http://people.apache.org/repo/m2-snapshot-repository
can't use the error is follow:
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] : org.apache.maven.archetype.exception.UnknownArchetype: The desired arch
etype does not exist (org.apache.struts:struts2-archetype-portlet:2.1.1-SNAPSHOT
)
The desired archetype does not exist (org.apache.struts:struts2-archetype-portle
t:2.1.1-SNAPSHOT)

How can we do