I've just been doing a little web development with RSF and it seemed that sometimes when accessing the RSF webapp I would get an error:
[An error occurred handling this RSF request]
[Context has not been started properly]
with a stack trace starting with:
WARN: Error initialising SakaiRSF servlet: (2008-07-15 10:07:43,909 http-9080-Processor21_PonderUtilCore)
java.lang.IllegalStateException: Error acquiring web application context - servlet context not configured correctly
at uk.ac.cam.caret.sakai.rsf.servlet.ReasonableSakaiServlet.init(ReasonableSakaiServlet.java:41)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1139)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:791)
It seems that this occurs if you access the RSF webapp while it is still starting up. The only way to fix it is to reload the webapp again and give it a little more time.