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If you are going with the later, then almost any bloging application will do the job, just place the install within your protected area.
You might want to have a look through hotscripts.com for suitable scripts to run your blog.
As for blogging software in JSP, please visit following urls. I'm sure you will find one which interests you.
Do post your comments as this will help people who are looking for JSP bloging softwares.