The component classes are: org.jboss.seam.ui.facelet.HttpSessionManager and org.jboss.seam.ui.facelet.MockHttpSessionManager.
Happened after the last update, though I cannot seem to find the MockHttpSessionManager.java in my workspace...
The MockHttpSessionManager class is however still in my generated jboss-seam-ui.jar that is created.
/K
Permission-rights prevented ant from writing the ui-jar somehow, ignore this.
/K