EL Expression failed with empty/not functions

This bug is duplicate-like bug withe the one i've post to Archiva's JIRA : http://jira.codehaus.org/browse/MRM-905

After installing as Wiki said, as a tomcat WAR, i get parsing error in some JSP/TAG code in the header only.
Nevertheless, some other data may not appear.... i've not checked it.

Some examples :
org.apache.jasper.JasperException: /WEB-INF/jsp/components/companyLogo.jsp(22,0) "${!empty(organisationLogo)}" contient d'incorrecte(s) expression(s): javax.el.ELException: Function ':empty' not found

The workaround is very simple :
replace EL expressions containing "empty(" with "empty (", and "not(" with "not (" as EL expression requires.

Everything works fine an identical configuration but a 6.0.14 tomcat version.

As said in the Archiva's defect, this error is due to 6.0.18 tomcat's update as Hans Wurst highlights.