J2ee profiling; Some advise needed ?

Hi All,
Iam having an J2EE application (running on Webshere application server) that i need to profile. Can somebody please advise some good profiling tools please ?
I need to know this profiling tool running on LINUX O.S.
Please advise.
Thanks,

Hi,
Optimizeit by Borland can be used on Linux and with Websphere.
Kaj

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