How to sync writing to a file?

Hi all,
I'm implementing a simple line logger for my web applications.
Basically, I have some class with a "write" method, that appends a line of text into a certain file.
All of my web apps log into the same file (by design).
How do I make sure writing to the file is synchronized?
The web apps cannot share logger objects between them (not even singletons, correct?) so using the 'synchronized' qualifier for the 'write' method won't work because each web app has its own instance of the logger object.
Also, FileLock won't work since all web apps "live" inside the same JVM (accoding to javadoc, FileLock is not suitable for syncing file-writes by different threads within the same JVM).
I've looked up the forum for answers to these questions, but non of the threads on this topic provided any leads...
Any ideas?

hii...
can sum1 plz tell me how to replace bytes in a file?
i've used randomaccess to open the file....read is
contents and write back to it at the desired
locations using seek()...however at some position if
i wish to read the data and replace it with new data
at exactly the same location...how can i do it??
bye.i had already mentioned my problem....actually i want to read a record from a file and then update it at the same location in the file...so i need to replace it(or delete the record and re-write the new info).

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