How to delete jdev preferences on mac

Hi,
I want to delete preferences data of jdeveloper on mac(like system folder in windows) since its still referring to old location after uninstall/reinstall because of that iam unable to install extensions properly. I have tried by uninstalling and reinstall but i could not.
I am getting message as "some updates have already been installed since Jdeveloper was started.It is strongly recommended that Jdeveloper is restarted before additional updates are installed. If you proceed, installed patches and extensions may not work properly".
So where can i find the folder of preferences of jdeveloper to delete or uninstall jdev completely.
Thanks
Shyam

Look in the help->about->properties section.

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