Map Display/API/19 [en]

To include additional metadata for use in the display (properties field) you can also use the MapDisplayProperties class to build the item:

MapDisplayProperties prop = MapDisplayProperties.createNew(MyCustomDisplay.class);
prop.set("creator", player.getName());
prop.set("background", "https://url/to/some/image.png");
ItemStack item = prop.getMapItem();
// Rest is the same