static parameters error on action

[nobeltr ozgur]

im working with tutorials of struts 2.1.6
i have error that i cant understand
i have an action class

   private static List<String> asya;
	private static List<String> avrupa;
	private static List<String> afrika;
	static {
		asya=new ArrayList<String>();
		asya.add("Japonya");
		asya.add("Birleşik Arap Emirlikleri");
		
		avrupa=new ArrayList<String>();
		avrupa.add("hollanda");
		avrupa.add("yunanistan");
		
		afrika=new ArrayList<String>();
		afrika.add("mısır");
		afrika.add("etiopya");
		
	}
//only getters
public static List<String> getAsya() {
		return asya;
	}





	public static List<String> getAvrupa() {
		return avrupa;
	}





	public static List<String> getAfrika() {
		return afrika;
	}
and execute method that return "success"
 

here is my jsp

  <s:merge id="ulkeler">
<s:param value="%{asya}"></s:param>
<s:param value="%{avrupa}"></s:param>
<s:param value="%{afrika}"></s:param>
</s:merge>
<s:iterator value="%{#ulkeler}">
<li><s:property/></li>
</s:iterator>  

i got an error
WARNING: param with value resolved as null cannot be make as iterator, it will be ignored and hence will not appear in the merged iterator

i know the error is about static fields but i there is noting coming of my page when i browse

can anybody help me please?

[David Newton]

Why is all your data static? It almost never should be in an S2 action--actions are instantiated per-request.