display java code on jsp

i tried to use actionmessages to display result back to my jsp.

my java code looks
this.addActionMessage("Update Successful");		
return SUCCESS;

my jsp code looks

<ww:if test="hasActionMessages()()"> 
    <tr> 
	  <td width = "40%" class = "generalMessageText">&nbsp;</td>
      <td width = "60%" class = "generalMessageText">Messages:</td>
    </tr>
    <ww:if test="getActionMessages()"> <ww:iterator value="messages"><ww:iterator value="value"> 
    <tr> 
	  <td width = "40%" class = "generalMessageText">&nbsp;</td>
      <td width = "60%" class = "generalMessageText"><ww:property/></td>
    </tr>
 </ww:iterator> </ww:iterator> </ww:if> </ww:if>

however, it does not display anything.  did i do anything wrong??
thanks for any help
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