Try using Google to get information.
Just because you happen to be a user of these forums (and also glancing at your posting history to see what sort of issues you are curious about) doesn't mean you should ask every question here at this web forum site.
When I place one of your sentences into Google,
"I came to know that SSL certificate can be generated with the web server like Tomcat also"
I get more than 800,000 search results that would easily guide toward better information than waiting for someone here to teach you about a non-Oracle topic.