I think it is a bug introduced in one of the last m2eclipse versions. So, the workaround is to click on "Edit Source Attachment" button in the editor opened for a missing class and manually attach the source jar from the Maven local repository where it is downloaded by m2eclipse.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.