Well, the good news is that I am adventuring into lists, the bad news is i need help. So as the title implies, I am trying to save an hashmap to a file. I have no idea where to start, so i came here. What would you recommend? Not a yml file, please, I want to make it just a .lkpk file, which is a file only my plugin can use. without a hex editor. Code: private static HashMap<Location, List<String>> ProtectedLocations = null; More code is there as well, but this is what i want to save to a file. Thanks in advance, LegoPal92.