Tomcat server error: 503 Service Temporarily Unavailable

the server was running fine the last few months then suddenly today and yesterday it 开发者_开发知识库just stop responding and returned the 503 error. it works when i restarted the server but in a few hours, it stops again and returns the 503 error. The problem is i don't know what causes the problem time to time. i checked the error log and the file size is too large; could this be the problem of the sudden error on the tomcat server?

Any Help Will do

Best to tail the log files, when the error occurs and debug from there. If the log files are too large, zero them out, make a backup of it, and restart Tomcat and try.