JSF action executed twice

Hello all,
sorry for my bad english.
I've a simple form with only one <h:commandButton> who execute an action method.
In this method i need to do a sleep of 60 seconds.
The strange thing is that while waiting the 60 seconds, the action method is executed twice !
This is my code:
SimplePage.jsp
<h:form id="simple_form">
<h:commandButton id="ok_button" value="OK" action="#{bBean.doAction}" />
</h:form>BackingBean.java
public String doAction()
    try
      Thread.sleep(60000);
    catch (InterruptedException e)
      e.printStackTrace();
    return "ok";
   }Any help is appreciate.
Carlo

Hi Raymond,
thanks for the reply.
As you suggested , I've created a JSP page with only one form and submit button that fires an action who sleep for 60 seconds.
In this case action is invoked only once.
Any suggestion ?
Thanks in advance
Carlo

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