JfreeChart-Grafico de barras

private JFreeChart getGraficoProducaoAno(String[] meses,int mes, int[] producao, int ano, String c, String nc )
	{
		
		DefaultCategoryDataset dataSet = new DefaultCategoryDataset();     	    	   	
    	String strMes;
    	
    	if(mes != 13){  
    		dataSet.addValue(0, nc, ""+mes );    		
    		dataSet.addValue(producao[mes - 1], c, ""+mes );
    		
    	}else{    		
    		for(int i=0;i<12;i++)
    		{
    			strMes =  meses[ i ];    			
    			dataSet.addValue(0, nc, strMes );    			
    			dataSet.addValue(producao[i], c , strMes );	    	 		 
    		}
    	}
		JFreeChart chart =  ChartFactory.createStackedBarChart(titulo,eixoX,eixoY,
                                             dataSet,
                                             PlotOrientation.VERTICAL,
                                             true,
                                             true,
                                             true );
		
		return chart;
	}