Continually opening a file in a java display to read errors?!

hello all,
I have what seems to be an easy task but hard for me. my question is, i am currently running a bat file that dumps all error logs into a error.log. what I would like to do is have my bat file also kick off a java program that reads the error.log file and print out the errors to screen? is there a easy way to do this? im thinking if this error.log file is being updated, maybe its locked, and that I wont be able to display the error logs sort of realtime right?
suggestions?
THANKS!

It's the file length you need to store.
Open the file up for the first time, read everything and remember its length.
Sometime later, check the file length again. If it's greater than the length you stored, open up the file, jump to the previous length, read everything from there up to the end of the file and save the new length. And repeat!
I wouldn't advise storing line numbers, since that doesn't translate into the file offset positions that Java needs easily.

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