http://numberformat.wordpress.com/2011/05/18/nexus-repository/
I am following the above link to setup Maven and Nexus, everything new. I couldn't left a new comment there so I post here.
After so long, I am in another company, when I tried to setup a simple sample in my local PC, I got this error in "mvn deploy" to the simple Maven my-app sample. I installed the simple Nexus Open Source w/o Tomcat.
[WARNING] Could not transfer metadata com.mycompany.app:my-app:1.0-SNAPSHOT/maven-metadata.xml from/to snapshots (localhost:8081/nexus/content/repositories/snapshots): Access denied to: localhosts:8081/nexus/content/repositories/snapshots/com/mycompany/app/my-app/1.0-SNAPSHOT/maven-metadata.xml , ReasonPhrase:Forbidden.