The struts documentation indicates that 'mapping.getAttribute()' returns the
mapping name. In the case of the perform method in an Action instance, this
is a passed in property.
Therefore, 'request.removeAttribute(mapping,getAttribute())' removes the
stored attribute from the request context where attribute is the name of the
mapping.
This would have been stored in the request context in some previous step.
However, in the case that the mapping.getScope() doesn't return 'request' it
is removed from the session scope.
----- Original Message -----
From: "Martin Zaidel" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, May 30, 2001 12:12 AM
Subject: Solution: bean attributes not displaying (please comment)
> Got it: My problem resided in these lines of code in perform() (which I
> copied from an Action class in the struts-example):
>
> if (mapping.getAttribute() != null) {
> if ("request".equals(mapping.getScope()))
> request.removeAttribute(mapping.getAttribute());
> else
> session.removeAttribute(mapping.getAttribute());
> }
>
> So my question to the list is: what exactly are these lines doing?
>
> Thanks,
> Martin
>
> Thomas Peters wrote:
> >
> > Thanks for your reply...
> >
> > I guessed that was the problem. I don't see the new instance being
created
> > in my log file. I also have a fully working struts demo, which does not
> > display this behavior. What's up with that?
> >
> > Tom
> >
> > ----- Original Message -----
> > From: "Martin Zaidel" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Tuesday, May 29, 2001 6:49 PM
> > Subject: Re: bean attributes not displaying - please help
> >
> > > I also have this problem, but alas, no solution (as yet). I've even
> > > tried
> > > in struts-config.xml to set the scope of the actions to "session", and
> > > have explicitly
> > > added the form to the session within the Action's perform(). I, too,
> > > can see the form properly populated. However, when the form's jsp is
> > > called, a new Form instance is instantiated----thus, the displayed
form
> > > is blank.
> > >
> > > Any ideas?
> > >
> > > > Thomas Peters wrote:
> > > >
> > > > I have a jsp page called 'customer.jsp' with a class call
> > > > 'CustomerForm' which extendes ActionForm.
> > > >
> > > > I have cut and paste my mappings and listed them below.
> > > >
> > > > The application flow is such, that I have a link with a URI of
> > > > /searchCustomers.do?action=Search. This action calls
> > > > 'CustomerSearchAction' which initializes a 'CustomerForm' with null
> > > > values for all the attributes except action, that's defaulted to
> > > > 'Search'. That works fine.
> > > >
> > > > When the end user completes and submits the 'CustomerForm' form, I
> > > > construct a query that returns a list of customers matching the
> > > > submitted criteria. 'Customers' is a class which contains a
Hashtable
> > > > of 'Customer' objects. This is accomplished with
'CustomerListAction'
> > > > and forwards to 'customers.jsp' which presents the results in a
list.
> > > > I have a 'LinkCustomerTag' class which builds links within the
> > > > iteration of 'customers' on the 'customers.jsp' page. The link looks
> > > > like this: '/editCustomer.do?action=Edit&custNum=10' where
> > > > 'custNum=10' dynamically changes throughout the iteration based on
the
> > > > current 'customer'. This works fine too.
> > > >
> > > > I select one of the links in the list which maps to '/editCustomer'
> > > > (see below) and calls the 'CustomerEditAction' class where I copy
the
> > > > properties to the instance of 'CustomerForm' and 'forward' to the
> > > > 'customer.jsp'. This is where my problem is.
> > > >
> > > > ****** The form is blank. ******
> > > >
> > > > I have lotts of comments in my code and can see that
> > > > 'PropertyUtils.copyProrerties(customerForm, customer)' is getting
> > > > called. I even modified the 'PropertyUtils' class to log the
> > > > properties being copied within the 'Enumeration' in the
> > > > 'copyProperties' method. You can see these values being copied into
> > > > the 'ActionForm' but when the 'forward' is called and the
> > > > 'customer.jsp' is displayed, it is empty.
> > > >
> > > > Please help...
> > > >
> > > >
> > > > ########################
> > > > struts-config.xml
> > > > ########################
> > > >
> > > >
> > > > <!-- ========== Form Bean Definitions
> > > > =================================== -->
> > > >
> > > > <!-- Customer form bean -->
> > > > <form-bean name="customerForm"
> > > > type="CustomerForm"/>
> > > >
> > > > <!-- Customer list bean -->
> > > > <form-bean name="customerList"
> > > > type="CustomerForm"/>
> > > > .
> > > > .
> > > > .
> > > > .
> > > >
> > > > <!-- ========== Action Mapping Definitions
> > > > ============================== -->
> > > > <!-- Search customer -->
> > > > <action path="/searchCustomer"
> > > > type="CustomerSearchAction"
> > > > name="customerForm"
> > > > scope="request"
> > > > input="/customer.jsp">
> > > > <forward name="success" path="/customer.jsp"/>
> > > > </action>
> > > >
> > > > <!-- List customers -->
> > > > <action path="/listCustomers"
> > > > type="CustomerListAction"
> > > > name="customerList"
> > > > scope="request">
> > > > <forward name="success" path="/customers.jsp"/>
> > > >
> > > > </action>
> > > >
> > > > <!-- Edit customer -->
> > > > <action path="/editCustomer"
> > > > type="CustomerEditAction"
> > > > name="customerForm"
> > > > scope="request"
> > > > validate="false">
> > > > <forward name="failure" path="/customers.jsp"/>
> > > > <forward name="success" path="/customer.jsp"/>
> > > > </action>
> > >
> > > --
> > > Martin Zaidel,
> > > Senior Software Engineer
> > > Cortex eBusiness P/L, Melbourne
> > > www.cortexebusiness.com.au
> > >
>
> --
> Martin Zaidel,
> Senior Software Engineer
> Cortex eBusiness P/L, Melbourne
> www.cortexebusiness.com.au
>
