Record locking

How does Oracle 8i handle record locking?
Is this handled completely in the background by oracle or are there explicit record locks that can be set.
I understand that an update or insert will lock the current record and the commit and rollback will release the lock.
I have a problem where some developers are using an odbc connection to access an oracle database while a java servlet app is accessing the same database using jdbc. At times the changes made through the servlet app are rolled back or are not processed and the changes made by the odbc connection are kept.
I am confused as to how this could happen.
any suggestions?

I have a simmilar problem, where my program aborts too often with a record Lock.
Everytime I do an update/delete I do it using the SELECT .... FOR UPDATE NOWAIT. In order to reduce the number of aborts due to record locks I'd like to try your suggestion of catching the ROW_LOCKED error, sleep(dbms_lock.sleep in PL/SQL), and retry getting the lock a certain amount of times prior to erroring out. Can You give me more details of how to do this.
In paticular how do you use dbms_lock.sleep function/package? where can I find this package? Can you share any code examples where you have used this package.
I greatly appreciate all teh help/suggestions you can provide to me.
Thanks.

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