I am new to eclipse plugin development.
How can I get the source code for all eclipse plugin development libraries? Without the source code, it is hard to debug calls or look into the implementation.
For most plugins, it is enough to use the context menu Import -> As Binary plugin in the Plugins view of the Plugin Development Perspective. If you need this for more than one plugin, you can do it using a wizard and multi selection.
If you are new to Eclipse plugin development, it will be very helpful to read more tutorials on the linked page, as it has many pointers.