Primefaces makes it a bit more tolerable, but JSF is an ancient, slow, buggy beast that's hard to integrate with anything. Managing state on the server for ever

Primefaces makes it a bit more tolerable, but JSF is an ancient, slow, buggy beast that's hard to integrate with anything. Managing state on the server for every little thing is not scale-able, even for a measly number of clients. You don't have to grow to be a Facebook to feel the effects of the bad design of JSF.