How to change the static global variale declared in struts action class

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Java

struts

servlet

I have global static boolean variable defined in struts-action class. How do i change its value from other Action class.

public class MyAction extends Action
{
   public static boolean existsFlag = false;

   public ActionForward execute(ActionMapping mapping,
       ActionForm actionForm, HttpServletRequest request,
       HttpServletResponse response)
   throws Exception
   {
      int a=10;
      if(a==10)
      {
         existsFlag = true; // is this ok to use
      }
   return mapping.findForward("successDisplayForm");
   }
}

Also I have another Action class, where i want to set this value to 'false' when transaction gets completed.

Please help.

Note : Using Struts-1.3