Both methods' first parameter should be a Path. The setProperty method should have one method for each JSR-283 primitive type, with the last parameter being of that type, and the setReference method's last parameter should be Path..., as follows:

setProperty(Path nodePath, String property, Path path)
setProperty(Path nodePath, String property, Boolean value)
setProperty(Path nodePath, String property, String value)
etc.

setReference(Path nodePath, String property, Path... paths)