Can you go a little more into the problems with equals() and hashCode(), or link to something? I'm by no means a hardcore Java programmer, but I've used it for

Can you go a little more into the problems with equals() and hashCode(), or link to something? I'm by no means a hardcore Java programmer, but I've used it for several projects, and these never stood out as particularly problematic to use and override, although I kind of see how they come across as kludgy in a whitetower kind of way.