Hey some of us get paid 750 usd / day to explain such things
And some others get 1000 usd / day to create such problems and to write such exceptions
If it worked before, i wouldn t worry. Did it work before ?
I guess it s a site problem, not your pc problem.
Try again a little later ..
If still a problem, i would restart my pc.
If still a problem i would start to wonder
if i changed some configuration recently, installed something recently.
I would also verify if all sites using Java throw the same error.
If still a problem let me know, i am not a java expert but i just love problem solving