I've /usr/local/tomcat/webapps/cas, where my java application is running. after interfacing Tomcat and Apache web server(httpd) after i try I can tell Login page, however when I attempt I acquired 404 not found from Apache web server not from Tomcat.

Not Found
The requested URL /cas was not found on this server.
Apache/2.2.3 (CentOS) Server at Port 443 that clarified by Apache web server is effective.

and so i think the issue should solve by setting up Apache web server to forward some request to tomcat. there's some helps on the internet but there is not a step-by-step guideline.

I suppose you're while using Apache Tomcat Connector for connecting Apache and Tomcat. Try to look for the area in Apache where your SSL is set up, for instance with a grep -R SSLEngine *. Then attempt to put the lines from the Apache Tomcat Connector configuration file /etc/apache2/mods-enabled/jk.load which have the effect of the bond that needs to be protected (say JkMount /idp worker1) within the <VirtualHost> from the SSL configuration file. For Ubuntu or Debian, this might be the /etc/apache2/sites-available/default-ssl file.