Look at the following code:

public class User {
 private String name;
 private List<SelectItem> temp_list;

...setter, getter

 public User() {
 if(this.getName() == null) {
 this.populate();
 }
 }
 public void populate() {
 temp_list = new ArrayList<SelectItem>();
 temp_list.add(new SelectItem("Sunday"));
 temp_list.add(new SelectItem("Monday"));
 temp_list.add(new SelectItem("Tuesday"));
 }

<a4j:region selfRendered="true" id="text">
 <h:selectOneMenu id="symbol" value="#{user.name}">
 <f:selectItems value="#{user.temp_list}" />
 </h:selectOneMenu>
 <a4j:commandButton action="#{user.getData}" value="Get"/>
</a4j:region>

Now whenever i press the button, populate() call again and list is populated with all three values again. I want to put the restriction that populate() should be call only once when the page loads.
Any suggestions.