--- old/src/windows/native/java/net/DualStackPlainDatagramSocketImpl.c	2017-04-24 13:59:14.127197140 +0100
+++ new/src/windows/native/java/net/DualStackPlainDatagramSocketImpl.c	2017-04-24 13:59:13.797155666 +0100
@@ -87,6 +87,8 @@
     IO_fd_fdID = NET_GetFileDescriptorID(env);
     CHECK_NULL(IO_fd_fdID);
     JNU_CHECK_EXCEPTION(env);
+    
+    initInetAddressIDs(env);
 }
 
 /*