How to make a Struts message null after used in JSP?

Hi,
In the context of Struts/JSP,
An action class might write error messages by
ActionError msg = new ActionError("msg.request.something");
ActionErrors msgs = new ActionErrors();
msgs.add(ActionErrors.GLOBAL_ERROR,msg);
saveErrors(request,msgs);
This message will produce a popup modal window by the following JSP code:
<logic:messagesPresent>
<html:messages id="error">

<script>javascript:alert('<%=error%>')</script>
</html:messages>
</logic:messagesPresent>
The problem is that this JSP page is shared by serveral actions: when another action invoke this page again, the previous error message will take effect again.
So my question is how to make message null after used once by its author.
Thx.
PY

msgs = null;

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