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Logger question

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Hi all,
I have a program with multiple processes. Each process spawn multiple threads. If I want each process to have a unique log file name (all threads associated with a process should write to the same log file), how would I go about doing this to gaurantee uniqueness?
I am mostly looking for setting the name of the log file dynamically in my program rather than using logging.properties file. Since I want each process to be able to specify its name as part of the logger name. For example if there are 3 processes in the system named two Servers and Client, log names should be something like:
Thank you,
Payam Fard
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Here is how I am doing it using logging.properties file:
# default file output is in user's home directory.
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.formatter =
java.util.logging.FileHandler.append = true
java.util.logging.FileHandler.level = FINE

Now, the log file names are all unique, but are names java0.log, java1.log, java2.log. If there is a way to somehow change the above pattern to include the name of the class that starts the process, it would be great.
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