I got following error :
SEVERE: Servlet.service() for servlet jsp threw exception
javax.el.ELException: The identifier [case] is not a valid Java identifier
If you are using Eclipse, for example, you have to add the folowing line to catalina.properties in Servers folder, (look for it in Package Explorer, and select your corresponding Tomcat folder):
org.apache.el.parser.SKIP_IDENTIFIER_CHECK=true
Remember that Eclipse uses different location for configurations rather CATALINA original directories.
It's worthy to take a look on Tomcat's properties page, at https://tomcat.apache.org/tomcat-7.0-doc/config/systemprops.html