Earlier this month, almost exactly a year after I started this Indonesian Odyssey, I finally set foot in Java. Except that I didn’t quite. As I clambered off the boat at Semarang before dawn, my feet plunged in to water, calf-deep. Semarang is Java’s third largest port; the Pelni boats were ranged four deep along the wharf. And every one of the thousands of passengers getting off here had to wade to dry land. Because Semarang is sinking. The city…