How to inject to class to become persistent?

Hi All Developers,

I have a problem about the Injection in web application using j2EE. I'am creating a customers entry.. The error is [ EntityManager can not be injected into a web application that uses multithread model because EntityManager is not thread safe. ]

but i put in customers_entry.java servlets

@EJB

private CustomersRemote customersBean;

.......

but here

protected void processRequest(HttpServletResponse response,

HttpServletRequest request)

{

........

try{

customersBean.create(1, request.getParameter("name")

, request.getParameter("address")

, request.getParameter("telno")

, request.getParameter("mobileno"));

}catch(Exception ex){

throw new EJBException(ex.toString());

}

}

.......

Kindly explain why it is occur like this...

Best Regards,

CJ

[918 byte] By [CJ_125a] at [2007-11-27 5:40:26]