I've yet to encounter the need for JAVA for flash playback. There are issues with Flash so try turning off Flash Hardware Acceleration.
we have an HP Envy DV6 7229WM Notebook running window 8, and we have all updates in it plus adobe flash and we have windows 8.1 installed as well. only way we could get java to install was to use java jdk, we got that too install fine,we added that to the enviroment variables in system path,ran the javac test in a cmd and java is working .all this and we still have trouble with the video play,the video screen goes green and will not run ??? Thank You for any help in this matter.