What is DWR?

As i am working on web application.It demands a lot of performace from UI perspective.
So i found Ajax is rescue for me.I am not going to explain what is Ajax.In the beginning when i was learing classical Ajax it was too boring and also it was not fitting in any architecture.So this made me to lose focus on Ajax.But one fine day i came across a framework called DWR I was amaged to learn about it.So from that time onwards i became lover of DWR.I have a very good knowledge of it.Its true when you love some one you will try to know a lot about it.
Now let me tell you what is DWR and what its advantage is over Classical Ajax.
DWR is simply Direct Web Remoting.A simple Ajax framework for java.
Its too simple to learn.Its preserves your apps architecture which classical does not.It segreggates java and UI codes(Of any framework Struts,JSF).The main advantage of this is that from UI we can directly call a java method which is nor possible in classical Ajax.Inorder to learn DWR you have to know few things like HTML,javascript and CSS if possible and thats all you can start doing Ajax programming.