Riemann Robert (Platinion) wrote:
Hello everyone,
(a second post since my mail editor just made the posting unreadable...
sorry!)
I need your help with a tricky problem, where I do not see any explanation
currently:
I try to construct a table with all data items stored in a database using
Hibernate.
There is a Form bean for the data items themselves and a form bean with a
Collection (ArrayList) with the list of all such data items.
Here is the relevant JSP code
...
<logic:present name="InterfacesOverviewForm">
<logic:notEmpty name="InterfacesOverviewForm" property="interfacesItems">
<table>
<logic:iterate id="InterfacesOverviewData"
name="InterfacesOverviewForm"
property="interfacesItems"
type="Presentation.form.InterfacesInputForm">
<tr>
<td>
<!-- put a property of the interfaces item in table cell -->
<html:text name="InterfacesOverviewData"
property="mainId" size="2"/> <!-- (**) -->
</logic:notEmpty>
<logic:empty name="InterfacesOverviewForm"
property="interfacesItems">
No Interfaces data items stored yet. <br />
</logic:empty>
</logic:present>
<logic:notPresent name="InterfacesOverviewForm">
No Interfaces data items available. <br />
</logic:notPresent>
In my OverviewInterfacesAction I do the following:
...
// read data from the persistence layer
Collection lDTOList = lService.readData();
// the list of form beans
ArrayList lFormInterfacesList = new ArrayList();
// convert DTO's to form beans
lFormInterfacesList = (ArrayList) convert(lDTOList);
// set the form bean collection into the form
lForm.setInterfacesItems(lFormInterfacesList);
// place the form with the collection into the request
pRequest.setAttribute("InterfacesOverviewForm",lForm);
// done
return (pMapping.findForward(Constants.SUCCESS));
}
I would expect that in my JSP, The iterate gets in each iteration one form
after the other out of the collection and that I have access to the
properties of the collection elements as in line (**)
Unfortunately there are two effects that I cannot explain:
1) With the code as above I get an Exception stating, that bean
InterfacesOverviewData cannot be found in any scope
Maybe convert() is returning null?
2) If I start the JSP with a
<bean:define id="InterfacesOverviewData"
name="InterfacesOverviewForm"
type="Presentation.form.InterfacesOverviewForm"/>
I still get a different exception, but this time stating, that there is no
getter method for property mainId in form InterfacesOverviewForm, which is
correct since that form contains a Collection with elements which all have
a property mainId and getter getMainId().
Yes, but your bean:define binds IngerfacesOverviewData to an instance of
interfacesOverviewForm, not to the element type.
3) If I try to access the Collection instead of a property in line (**),
i.e. I change the line to:
<html:text name="InterfacesOverviewData"
property="interfacesItems"
size="150"/>
Then I see the the ArrayList printed (I provided a toString() method in the
InterfacesInputForm (i.e. the form which represents an element of the
Collection), thoug obviously the Collection is there and can be accessed.
With or without the bean:define? Shouldn't that be
name="InterfacesOverviewForm"?
4) A further observation which I cannot explain might indicate that the
heart of my error in not caused by the logic:iterate tag itself:
both branches of the surrounding logic:present and logic:empty checks,
i.e.,logic:present and logic:notPresent and logic:empty and logic:notEmpty
are executed (with the code as described until (3))
That sounds a bit odd... I'd suggest adding some debugging code to the JSP to
print out everything in the various scopes to make sure everything's as you
expect it.
L.
--
Laurie, Open Source advocate, Java geek and novice blogger:
http://www.holoweb.net/~laurie/
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