Java CANT render flash, thats why you dont see anything. The only way i have read is about using a quicktime wrapper, since quicktime can use flash.
yahoo recomends me to upgrade the browser
Of course it will, since you are NOT using Internet Explorer, or Mozilla. Nor are you sending a message to the website, to trick it to think that you are a different browser. Unfortunately i dont remember how i did that (it was about 2 years ago) but i am sure you can find it trough a little bit of googling