Interator values not showed

[slayer666]

Hi,
i'm trying the append tag and the list values of the appended lists are not
showed.
This is the main part of the jsp code:

<s:append var="metalBands">
   <s:param value="%{groups}"/>
   <s:param value="%{groups1}"/>
 </s:append>
 Total Bands:<br>
 <s:iterator id="band" value="%{#metalBands}">
   Band: <s:property value="#band.name"/><br>
 </s:iterator>


This is my Action class:

package struts2.action;

import java.util.ArrayList;

import com.opensymphony.xwork2.ActionSupport;

public class IteratorAction extends ActionSupport {
        ArrayList<Band> groups=new ArrayList<Band>();
        ArrayList<Band> groups1=new ArrayList<Band>();
        
        public String greeting(){
                return "Hi, Every body";
        }
                
        @Override
        public String execute() throws Exception {
                this.groups.add(new Band("trash","Slayer"));
                this.groups.add(new Band("trash","kreator"));
                this.groups.add(new Band("death","Deicide"));
                this.groups.add(new Band("death","Obituary"));
                this.groups1.add(new Band("heavy","Judas Priest"));
                this.groups1.add(new Band("heavy","Primal Fear"));
                return SUCCESS;
        }

        public ArrayList<Band> getGroups() {
                return groups;
        }

        public void setGroups(ArrayList<Band> groups) {
                this.groups = groups;
        }

        public ArrayList<Band> getGroups1() {
                return groups1;
        }

        public void setGroups1(ArrayList<Band> groups1) {
                this.groups1 = groups1;
        }                       
}

This is my bean class:

package struts2.action;

public class Band {
        private String style;
        private String name;
        
        public Band(String st,String n){
                this.style=st;
                this.name=n;
        }

        public String getStyle() {
                return style;
        }

        public void setStyle(String style) {
                this.style = style;
        }

This is the ouput application:

Total Bands:
Band: 
Band: 
Band: 
Band: 
Band: 
Band: 

As you can see there is no values showed .
Please, can you help me with this?.

Thanks in advanced!!.
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