Hi,
On Mar 21, 2009, at 5:42 PM, Charles So wrote:
 hello
 I've followed the instructions and installed xwiki 1.8 enterprise. I
 used
 Leopard Server 10.5.6, Tomcat 5.5, PostgreSQL 8.3.
 Tomcat is running on port 8080. PostgreSQL has been running fine for
 Bugzilla, and xwiki database and xwiki user are created, and I can
 log into
 database using the new user ID.
 JDBC driver is place in the correct location.
 I didn't set TOMCAT5_SECURITY becos /etc/default directory does not
 exist.
 hibernate.cfg.xml and xwiki.cfg are changed according to instructions.
 Upon typing 
http://myservername.com:8080/xwiki, the URL becomes
 
http://myservername.com:8080/xwiki/bin/view/Main/ , and the web
 browser
 displays a blank page. The page source is empty.
 There is no xwiki.log in Tomcat's directory, but catalina.out shows
 this :
 Mar 21, 2009 10:46:00 PM org.apache.catalina.core.StandardContext
 reload
 INFO: Reloading this Context has started
 log4j:ERROR setFile(null,true) call failed.
 java.io.FileNotFoundException: xwiki.log (Permission denied) 
XWiki tries to write its log file in the location from where you start
tomcat and it seems the user under which the tomcat process is started
doesn't have the permission to create a file there.
[snip]
Thanks
-Vincent