did you delete and "reinstall" your JBoss? This is probably the easiest way to bring it back to life.
Normally, the deployed files can be found in "JBOSS_HOME\server\default\deploy" (replace "default" by the name of your current configuration, if you have one).
I assume that you didn't change any of the config files?
yep, re-installation solved the problem- i'll never know what caused the problem but hey, with any luck it won't re-occur (fingers crossed)
Thanks for your response.
In deployment file location, "JBOSS_HOME\server\default\deploy" there was that .war already present so i have deleted it and it solved the issue.