What is the basic things to be follow for mapping a tomcat web application to domain?

Tomcat as your primary web server is not recommended since you’ll have a difficult time setting up security arrangements, like setting security certificates for https. Having said that, the quickest way is to disable or remove apache/nginx from listening to port 80, and then configure Tomcat to take over that port.

Your apache proxy settings looks a bit off. Save a copy of your existing apache configuration somewhere else (like your home directory), and try modifying your current apache configuration entries to something like this

<VirtualHost *:80>
 ServerName www.domain.com
 ProxyPreserveHost       On
 ProxyRequests   Off
 ProxyPass / http://localhost:8080/domain/
 ProxyPassReverse / http://localhost:8080/domain/
 RewriteEngine on
 RewriteCond %{SERVER_NAME} =www.domain.com
 RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]
</VirtualHost>

<VirtualHost *:443>
 ProxyPreserveHost On
 ProxyRequests Off
 ProxyPass / http://localhost:8080/domain/
 ProxyPassReverse / http://localhost:8080/domain/
 ServerName www.domain.com
 SSLEngine on
 SSLCertificateFile /home/developer/domain.crt
 SSLCertificateKeyFile /home/developer/domain.key
 SSLCertificateChainFile /home/developer/intermediate.crt
 SSLCACertificateFile /home/developer/ca-bundle.crt
 </VirtualHost>

A few more non-critical notes: the standard location for your SSL certificates should reside on a secure location, like somewhere in /etc. Also, you may want to explicitly add the error and access logging locations in the section shown above.

Hope that works for you.