code: public static StackInfo getStack() {
  		 StackInfo result = MDC.get();
  		 return result == null ? new StackInfo() : result;
  	 }
docs: Returns current stack information. It is called by log handler to get
  thread specific information which is either passed for the record in a
  request or obtained from the thread directly.
  
  @return {@link StackInfo} instance setup in the current thread