Your book's great, it's really good for learning extJS not just at beginners level, but for actually becoming an extJS professional web developer.

I downloaded the ext-3.3.0.zip package and the Ext.Direct zip package as well for building a java web app, but the thing is, I really don't know which files and folders are actually required for extJS to run.

It has a lot of folders, and I can't just include the whole folder, because when I build my WAR archive for deployment or when building the app, the thing is just WAY too big.

So, I don't know if adapter folder is required, or if just resources and ext-all.js, or what, please help.

You need

adapter/ext/ext-base.js
ext-all.js
resources/directories (strip out the gray theme)