At top of page, Thread.current should be Thread.currentThread.  (I assume
this is a reference to java.lang.Thread because I did not find any Scala
class called Thread.)

FIXED in 2ed

l.17 mixed into to any class
-->  mixed into    any class

FIXED

l.-11 avoid sending message to actors
-->                 messages

FiXED

l.-5 stays is the same
-->  stays    the same

FIXED