And there seems to be a bug with the handling of error reports. For every status-code greater than 400, tomcat generates a html-message wich will be send to the client. If you set a status-code in a sevlet, wich is not listed in org.apache.catalina.valves.LocalStrings.properties (999 for example), the html- message looks like this: HTTP Status 999 - Cannot find message associated with key '999'. ( org.apache.catalina.util.StringManager.getStringInternal() - in the catch- block null could be a better return value ) In my configuration I use tomcat with apache and mod_jk 1.2.5.
*** This bug has been marked as a duplicate of 29846 ***