Now,  I develop the Web application by using localhost  and I found 
that when I use request.getSession() of same session from  JSP( the first 
page- to sent to Servlet  )which keep Connection object attribute inside 
the session and when running this application ,It 's okay and no problems.

       However, When I try to do the same thing to deploy on cloud with 
Google app engine ,I got the problem when Servlet is requested the session 
from JSP that sent by using session.getAttribute() method and found that 
the value of connection object (Attribute of session) return null .

      Why I do the same situation but the servlet cannot get the old value 
from attribute/session on Google app engine?  How should I do in this case?
      Thanks in advance .

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