Remove Java

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http://forums.fedoraforum.org – Installed the latest java from their site 7-11 and am having issues getting firefox to run java apps. I've read around and found that if any pre-excisting java is on the system prior to 7-10 it has a tendancy to cause issues. So I need to scrap all of it and do a clean install of the most recent rpm. Trouble is I dont know how to remove it, Any ideas? (HowTos)