Is that an actual error when you run it or just a validation error in the IDE? IDEs tend to be bad at parsing JSPs. Especially those that use other technologies in them (JForum uses Freemarker.) I recommend turning off the jSP validation and just trying to run it.
Thanks your Solution Worked for me
Now I would like to Know few things
1)Is it free or OpenSource or both?(I am new to this world of programming)
2)When I try to run Install.jsp it is trying to access my database I know its necessary.But Where is database is configured in your JSP file So that I can modify this according to my requirements?
3)Can I modify It completely According to my requirement.I have many applications of my client where can I use it?(The Client Application are Premium,They are Paying Us) And Product I am building from them is also premium i.e they will get revenue from this forums section in their web application)
So Is there any such kind of restriction in this product?
JForum is open source available under the BSD license. You should read the license (and maybe the license's Wikipedia page for some additional information) before progressing. BSD-style licenses are very permissive, though, and not viral like the GPL.
I would strongly advise to base your work on the JForum fork hosted at https://code.google.com/p/jforum2/, though. It contains numerous bug and security fixes as well as feature improvements over the now-obsolete 2.1.9 version. Note that a 2.4.1 version will become available within the next few weeks; that's what you should use for production use. That fork is supported at http://jforum.andowson.com/.