What are the things to consider if we start a website using j2ee or someother

[ms_cs]

I heard about the starting the website. If I developed a site using j2ee, what are the other things do I need to setup? How can I increase the security of site?
Is there any other issues associated with starting a website and managing it like security?

CMS tools are meant for managing content alone?
What are the tools that are better than CMS?

What is robots.txt file? Every website owner need to create this file?

[goyal420]

A robots.txt is a file placed on your server to tell the various search engine spiders not to crawl or index certain sections or pages of your site. You can use it to prevent indexing totally, prevent certain areas of your site from being indexes or to issue individual indexing instructions to specific search engines.
For more information
Creating and Using a robots.txt File
and thanks for asking about this file.

[ms_cs]

thanks for information buddy