Ran into a stange situation where starting up the app server resulted in an exception. It appears the error manifests itself thinking there is no function mapped to the name fn:toLowerCase. This started happening after fixpack 19 was applied over fixpack 11. Long and short of it is the solution was to clear out the tmp files so the JSPs were recompiled after applying fixpack 19.
00000042 ServletWrappe E SRVE0068E: Could <br /> not invoke the service() method on servlet /global/tiles/g <br /> eturl.jsp. Exception thrown : javax.servlet.ServletException: No <br /> function is mapped to the name "fn:toLowerCase" <br /> at org.apache.jasper.runtime.PageContextImpl.handlePageException <br /> (PageContextImpl.java:650) <br /> at com.ibm._jsp._geturl._jspService(_geturl.java:192)