Diifferent java apllications write to the same flat file database

I have a variety of java applications that need to be able to write diagnostics to the same flat file database (containes just one file). Could somebody give me the pointers what is the best way to write my applications so that different application not need to worry about the updates in file?
They should be able to write whenever they want.

JavaFunda wrote:
I have a variety of java applications that need to be able to write diagnostics to the same flat file database (containes just one file). Could somebody give me the pointers what is the best way to write my applications so that different application not need to worry about the updates in file?I guess my question would be: is it a file or a database (as in an RDB)?
I think EJP's post was aimed at syncing writes to files (and he'll definitely tell me if I'm wrong : )), but it may be redundant if, in fact, your output is going to a database.
Also, Java has some quite sophisticated logging applications (I believe log4j is quite popular; but there are others), which may serve your needs.
Winston

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