How to fill an selectOneMenu and selectManyMenu from my database and retrieve the option selected

[Tom Ram]

Hello
I am new to programming world
I want to fill an selectOneMenu and selectManyMenu from my database.
I have found a simple of code that fill selectonemenu , so I have cutomised it to my need . but I haven't really understand it, I dont know how to retrieve the choice done by the user. (For selectManyMenu I dont know how to do that)
Do I need a button to validate to retrieve data choosed , because I nees the option choosed as a parameter for another request.
the code is:
MY JSF:
<form>
<h:selectOneMenu value=" #{BeanSelectItem.maValeur}" >
<f:selectItems value="#{BeanSelectItem.mesElements}"/>
</h:selectOneMenu>
<hutputLabel value="#{BeanSelectItem.maValeur}" />

</form>


MY BEAN:


public class BeanSelectItem {
private List<SelectItem> mesElements;
private String maValeur;

public String getMaValeur() {
return maValeur;
}

public void setMaValeur(String maValeur) {
this.maValeur = maValeur;
}



public void setMesElements(List<SelectItem> mesElements) {
this.mesElements = mesElements;
}

public Iterable<String> remplireItem() throws ClassNotFoundException, SQLException
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbcracle:thin:@localhost:1521:xe"," "," ");
PreparedStatement statement = con.prepareStatement("SELECT pname from issuestatus");
ResultSet rs = statement.executeQuery();
String var;
ArrayList<String> list = new ArrayList<String>();
while(rs.next())
{
var= rs.getString("pname");
list.add(var);

}


return list;
}

public List<SelectItem> getMesElements() throws SQLException, ClassNotFoundException {

if (mesElements == null) {
mesElements = new ArrayList<SelectItem>();
for (String val : remplireItem()) {
mesElements.add(new SelectItem(val));
}
}
return mesElements;
}

}

Thank you