Whenever you work with
Java, ALWAYS be case-sensitive. It can not only save you some puzzlement, but if you ever need to run on a fully case-sensitive platform - for example, management got fed up with Code Red and ordered a switch to BSD - you'll have one less item to convert.
For the same reason, I recommend you always specify filepaths in "Unix" format. Java understands how to accomodate Windows, so there's less editing required there as well. Plus, in program code, the backslash character is an escape character, and I can't begin to count them number of times I've burned myself because of that.
Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.