private IllegalStateException illegalState(){
  return new IllegalStateException("Grid is in invalid state to perform this operation. " + "It either not started yet or has already being or have stopped [gridName=" + gridName + ", state="+ state+ ']');
}

private IllegalStateException illegalState ( ) { return new IllegalStateException ( "Grid is in invalid state to perform this operation. " + "It either not started yet or has already being or have stopped [gridName=" + gridName + ", state=" + state + ']' ) ; }
creates new illegal state exception .
