Writing a Java tool to analyze redo log file

Could you tell me the redo log internal format? I want to write a Java tool to analyze it.

Why reinvent the wheel? Check out LogMiner functionality already available in 8i. Using LogMiner you can capture the contents of one or multiple redo log files (or archived redo log files) and have their contents stored in a view called v$logmnr_contents. If you look at this view, you'll see the elements that were "mined" from the logs. Check out the Oracle Administrator's Guide documentation for a full description of LogMiner and how it works and can be used.

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