Anyone maintaining or know of a custom DatagramSocketImpl ?

DatagramSocket and MulticastSocket delegate to a DatagramSocketImpl, a provider-like mechanism that dates from early JDK releases. I'm wondering if anyone is aware of any implementations and whether they are still maintained. The context for asking is whether anyone would notice if the JDK dropped support for pre JDK-1.4 (2002) implementations. My guess is "no" because MulticastSocket can't work with a DatagramSocketImpl that hasn't been upgraded. If you maintaining a DatagramSocketImpl, or know of any, then it would be also useful to know if it has been updated to override the setOption/getOption methods that were added to DatagramSocketImpl in Java SE 9. Thanks, -Alan