> <%@ page import='sample.invoice.*' %>
> <html>
> <head>
> <jsp:useBean id='invoice' class='InvoiceBean'/>
> <jsp:setProperty name='invoice' property='status' value='pending'/>
> <jsp:scriptlet> invoice =
InvoiceRepository.getInstance().getInvoice(1);
> </jsp:scriptlet> <!-- Here, I am attemtpting to initialise 'invoice'
to
> A new InvoiceBean object is retreived from the repository -->
I'll try to explain this and hopefully somebody corrects me if I get
some details wrong. You might need some knowledge about objects and
references/pointers to understand this.
One could say that the beans and the scriplet variables are in different
contexts. When you create a bean you automatically get a scriplet
variable with the same name.
Lets call them invoice[bean] and invoice[scriptlet]
<jsp:useBean id='invoice' class='InvoiceBean'/>
<jsp:setProperty name='invoice' property='status' value='pending'/>
After these two tags both the bean and the scriptlet variable references
the same object. You could say invoice[bean] = invoice[scriptlet] -> an
invoice which is pending.
<% invoice = InvoiceRepository.getInstance().getInvoice(1); %>
This affects ONLY the SCRIPTLET variable. So, the scriptlet variable now
point at a different invoice!
invoice[bean] -> an invoice which is pending.
invoice[scriptlet] -> an invoice from the repository.
I believe that you can make the bean point at the same new object by
using:
pageContext.setAttribute("invoice",invoice); // ("beanName", object)
(Anyone please correct me if I'm wrong).
Good luck.
Mattias Jiderhamn
Expert Systems
[EMAIL PROTECTED]
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