class EventMachine::JEM

the alias “EM” for module EventMachine. (FC, 20Jun08)
This thunk class used to be called EM, but that caused conflicts with

def eventCallback a1, a2, a3, a4 

def eventCallback a1, a2, a3, a4
  s = String.from_java_bytes(a3.array[a3.position...a3.limit]) if a3
  EventMachine::event_callback a1, a2, s || a4
  nil
end