Eclipse, open declaration that is defined in a library

Question

In Eclipse if I press F3 or open declaration on a reference that is in one of my libraries, it opens a read only copy of the code.

I thought this quite useful at first a

Answer 1

You need to attach correct source when you ctrl+click or press F3 to any class which is in the library. Just click on attach source -> external folder -> attach the src folder of the library you are using. Eclipse will itself find out the correct .java file.

I had the same issue with Action interface in struts 2.0. So i attached the src folder inside my struts directory and bobs your uncle.