I want to know steps to do chat like chat demo .
When I compare it with Hello World tutorial I didn't find class files just jar file in lib folder .

I can understand client side but server side is harder.

After do client side then we must do data adapter,ok.

Do I have to work DataAdapterand metadataAdapter for each application?
what should I write in every one of them?
what is important methods we must write it in each one?


Sorry for my bad English.