Jasper output the message of compiling error using LF(\n) on ANY OS. This cannot be correctly displayed with Windows notepad. I think the line feed code along OS would be better, though I know other text editor solves this.
Fixed in trunk and 7.0.x and will be included in 7.0.21 onwards. I do not plan to back-port this to 6.0.x or 5.5.x.