put datas from database to chart primefaces -

i want put datas database chart primefaces. try different methods without result. try simple method dosen't display nothing: managedbean:

public class chartbean implements serializable{     private list < chartcontentbean > chartcontentbeanlist;      public chartbean() {         chartcontentbeanlist = new arraylist < chartcontentbean > ();         chartcontentbeanlist.add(new chartcontentbean(2006, 25, 20));         chartcontentbeanlist.add(new chartcontentbean(2007, 60, 50));         chartcontentbeanlist.add(new chartcontentbean(2008, 40, 65));         chartcontentbeanlist.add(new chartcontentbean(2009, 70, 60));     }     public list < chartcontentbean > getchartcontentbeanlist() {         return chartcontentbeanlist;     } }   

chartcontentbean.xhtml

public class chartcontentbean{     private int year;     private int passpercentage;     private int failedpercentage;      public chartcontentbean() {}     public chartcontentbean(int year, int passpercentage, int failedpercentage) {         this.year = year;         this.passpercentage = passpercentage;         this.failedpercentage = failedpercentage;     }     //get , set } 

chart.xhtml

<xmlns:p="http://primefaces.prime.com.tr/ui"> <h:form>   <p:linechart value="#{chartbean.chartcontentbeanlist}" var="chartcontentbean" xfield="#{chartcontentbean.year}">     <p:chartseries label="class a"     value="#{chartcontentbean.passpercentage}" />     <p:chartseries label="class b"     value="#{chartcontentbean.failedpercentage}" />   </p:linechart> </h:form> 

well take @ http://www.primefaces.org/showcase/ui/barchart.jsf in primefaces showcase nice example want achieve. if follow showcase see you're missing.