Can you save groups of tabs in Eclipse so you can open them later?

Question

I have several different processes within a single project that I work on. I am constantly opening and closing tabs(java files) in the code editor for that particular process.

Answer 1

Mylyn should be your answer here.

Mylyn is a task-focused interface for Eclipse that makes working with very large workspaces as easy as working with small ones.
Mylyn extends Eclipse with mechanisms for keeping track of the tasks that you work on.

Mylyn monitors your work activity on those tasks to identify information relevant to the task-at-hand. Mylyn monitors Eclipse and captures your interaction in a task context.
System artifacts such as files, types, methods, and fields get assigned a degree-of-interest based on how recently and frequently you interact with them.
This results in uninteresting elements being filtered from view within Eclipse, allowing you to focus in on what is important.

Following Saheed's answer, don't miss CodeKiller's comment:

You can

• Activate the task to reopen all files and
• Deactivate the task to close all the files.

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Bookmarks (mentioned here by user1039663) is a valable alternative.