Is it possible to group projects in Eclipse?
Eclipse offers working sets. You can reduce the projects shown in the Package Explorer and other places to whichever projects you defined into the working set. You can also show the union of various sets, and similar gymnastics.
You can define/edit/delete working sets from the little triangle dropdown menu on the Package Explorer and similar directory views.
You have two options, as far as I know:
use the already suggested Working Set option: you can create custom groups, use them to focus on a particular area of a project, activate them through Mylin; a really powerful tool indeed
use the basic concept of workspace which allows you to work on many projects and relate them (via the Build path "Projects" tab, and "Java EE Module Dependencies") so that when you need resources from other projects or you need to deploy them along with your main web application Eclipse will do that for you
Using Working Sets, you can add and organize them as shown in the picture :
As you can see my Java projects are in Working sets like Sem1 and TPs.
When you create an all new Project, just add the project to your working set, like this :
