I am confused, the documentation http://docs.jboss.org/picketlink/2/latest/reference/html/sect-Configuration-2.html
is for the latest of the second version of the picketlink, and explains the org.picketlink.config.http.HttpSecurityBuilder (chapter 12.2).
However, I cannot locate this Class inside the 2.6.1 Final version.
The library is loaded from maven
<dependency>
<groupId>org.picketlink</groupId>
<artifactId>picketlink</artifactId>
<version>2.6.1.Final</version>
</dependency>
i found the class in version 2.7.0.Beta1.