Plain map of Java for the location map scheme with administrative borders and surrounding islands belonged to the provinces in the island. I did not add maritime borders for the provinces because I did not find any official sources in regards to it.
Own work based on sources;
Reservoirs, lakes, administrative borders (province), rivers: © OpenStreetMap contributors (ODbL)
Coastlines: GSHHG Version 2.3.7 June 15, 2017, Lesser GNU Public License "v3 or any earlier version"
Sources were modified.
RXerself