我建议下载javadocs 并添加他们在日食（右键单击项目>属性> java构建路径>库>展开库>设置Javadoc位置）

I'm new to Eclipse and am using it currently to play with Java EE.

When using Ctrl+Space for types/functions from the regular Java libraries I get a full description (i.e. general description of the type, what are the arguments of the method for, etc.). However I don't get the same for Java EE types.

For example, when using Ctrl+Space on methods of the HttpSession class I get only names like "arg0" or "obj" and no description.

Is there some kind of a package I can install to remedy this?

I'd suggest downloading the javadocs and adding them in eclipse. (right click project > properties > java build path > libraries > expand the library > set Javadoc location)