MicroEmu does not accept datagram address in Sun standard.
UDPDatagramConnection conn;
conn.newDatagram(buff, length, "datagram://server:port");
The above line will throw an exception. I must remove "datagram://" from the address string to make it work. However according to Sun MIDP specs and Sun Wireless Toolkit Emulator, we must provide the schema.
Issue item has been moved to
http://code.google.com/p/microemu/issues/detail?id=24