In JSF,how to get parameter values form my sql to jsf the page? -

i first made sql, zdsql, project：

create table zdsql(   id integer primary key,      filter varchar(12),   value varchar(12),    descri varchar(12),   standard_number integer,                   language varchar(12) );  insert zdsql values(1,'zdlj','1','1.rid',1,'en'); insert zdsql values(2,'zdlj','2','2.ria',1,'en'); 

next, made jsf, following codes maining of xhtml:

<h:outputlabel value="#{msgs.zdlj}" style="font-weight:bold" /> <p:selectonemenu id="zdlj1" value="#{zsjbean.zdlj}">     <f:selectitems value="#{zdsqlbean.zdsqls}" var="bll1"            itemlabel="#{bll1.descri}" itemvalue="#{bll1.value}" /> </p:selectonemenu> 

the follwing codes maining of zdsqlbean:

package bean;  import java.util.list; import java.util.logging.level;  import javax.persistence.typedquery;  import model.zdsql;  import util.dbdao;  public class zdsqlbean {   private list<zdsql> zdsqls;   public zdsqlbean() {     this.genzdljs(); }      public list<zdsql> getzdsqls() {     system.out.println("zdsqls==");     return zdsqls; }  public void setzdsqls(list<zdsql> zdsqls) {     this.zdsqls = zdsqls; }     public void genzdljs() {     try {         string querystring = "select m zdsql m m.filter = :filter order m.id";         typedquery<zdsql> query = dbdao.getentitymanager().createquery(                 querystring, zdsql.class);         query.setparameter("filter", "zdlj");         zdsqls = query.getresultlist();      } catch (exception re) {         dbdao.log("genzdljs() failed", level.severe, re);     } } 

however, still don't right values. when run project, selectonemenu has nothing, should have 2 selectitems, values should same sql.

from comments, problem haven't configured zdsqlbean managed bean. there 2 ways this:

1. add configuration in faces-config.xml file:

   <managed-bean>     <managed-bean-name>zdsqlbean</managed-bean-name>     <managed-bean-class>bean.zdsqlbean</managed-bean-class>     <managed-bean-scope>none</managed-bean-scope> </managed-bean> 

2. since jsf 2, use @managedbean annotation decorate class.

   @managedbean(name="zdsqlbean") //name optional public class zdsqlbean {     //class definition } 

this covered in decent jsf tutorial, can find in stackoverflow jsf wiki. if you're learning/reading jsf 1.x resources, drop them , go jsf 2. note it's in version 2.2.