documentclass[journal]{IEEEtran}
usepackage{listings}

% "define" Scala
lstdefinelanguage{scala}{
  morekeywords={abstract,case,catch,class,def,%
    do,else,extends,false,final,finally,%
    for,if,implicit,import,match,mixin,%
    new,null,object,override,package,%
    private,protected,requires,return,sealed,%
    super,this,throw,trait,true,try,%
    type,val,var,while,with,yield},
  otherkeywords={=>,<-,<%,<:,>:,#,@},
  sensitive=true,
  morecomment=[l]{//},
  morecomment=[n]{/*}{*/},
  morestring=[b]",
  morestring=[b]',
  morestring=[b]"""
}

usepackage{color}
definecolor{dkgreen}{rgb}{0,0.6,0}
definecolor{gray}{rgb}{0.5,0.5,0.5}
definecolor{mauve}{rgb}{0.58,0,0.82}

lstset{frame=tb,
  language=scala,
  aboveskip=3mm,
  belowskip=3mm,
  showstringspaces=false,
  columns=flexible,
  basicstyle={smallttfamily},
  numbers=none,
  numberstyle=tinycolor{gray},
  keywordstyle=color{blue},
  commentstyle=color{dkgreen},
  stringstyle=color{mauve},
  frame=single,
  breaklines=true,
  breakatwhitespace=true
  tabsize=3
}
% A number of keyval errors occur here - basically
% nothing in lstset is recognized. Errors look like:
% ! Package keyval Error:   breakatwhitespace undefined.

begin{document}

begin{lstlisting}
object Test {
   def main(args: Array[String]) {
      var a = 0;
      // for loop execution with a range
      for( a <- 1 to 10){
         println( "Value of a: " + a );
      }
   }
}
end{lstlisting}

end{document}