In class FileDatabaseHistory line 77 I get a NullPointerException if I have no parent folder on the "database.history.file.filename" property.

What causes the NPE is that "path.getParent()" returns null, which is then passed as a parameter to "Files.createDirectory(null)", and it in turn throws the exception.

I got it working by passing "/history/dbhistory.dat" as dbhistory filename. The same behaviour does not occur for the offset storage filename property.

If that's ok I´ll take a look at this and submit a PR fixing it.