Java EE (Java Enterprise Edition) General Discussion

I'm really get mad of this Error report:
org.apache.jasper.JasperException: Duplicate component ID 'info_welcomePage:_id16' found in view.
   at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
   at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
   at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
   at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
   at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
   at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:142)
   at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
   at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
   at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
   at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
......

I've tried every means to assign ids either explicitly or implicitly, still this nightmare happens again and again, from one page to another, esp. when I revise the page and try to refresh it, or give one page multiple views according to different previledges...

Is there some common rules to follow to prevent this from ever happening?? Thank you so much...

Nicky

Looking forward to replies....