Simply they're is no Cast at all !
Tags use commons-beanUtils. This package uses javaBean standard to get properties from
objects. In fact they use the
java.beans.PropertyDescriptor class to get property getter and setter, without having
to know the class used.
Nico.
> Hi Nicolas,
> After some reading, I wrote the following code that works pretty well...
>
> <logic:iterate name="objA" property="hTable" id="objB" >
> Next element is <bean:write name="objB" property="value.prop" />
> [<bean:write name="objB" property="key" />]
> </logic:iterate>
>
> I don't fully understand how the cast from Object to ObjB is performed but
> it works....
> Thanks for your help.
>
>
> ----- Original Message -----
> From: "Nicolas De Loof" <[EMAIL PROTECTED]>
> To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> Sent: Thursday, March 27, 2003 12:24
> Subject: Re: Using JSP struts tag logic:iterate
>
>
> > YOu can read this on struts-logic doc :
> >
> > Normally, each object exposed by the iterate tag is an element of the
> underlying collection you are iterating over.
> > However, if you iterate over a Map, the exposed object is of type
> Map.Entry that has two properties:
> >
> > key - The key under which this item is stored in the underlying Map.
> > value - The value that corresponds to this key.
> >
> > So, you should use :
> >
> > logic:iterate name="objA" property="hTable" id="objB" indexId="ind"
> type="ObjB" >
> > Next element is <bean:write name="objB" property="value.prop" />
> > [<bean:write name="value.ind"/>]
> > </logic:iterate>
> >
> > Nico.
> >
> > > Thanks for your help Nico,
> > > As you recommend I've checked into my ObjB class and the property "prop"
> > > looks well formed :
> > >
> > > - "prop" is of type String
> > > - there is only one getter (getProp() ) and one setter (setProp(String
> p) )
> > > - getProp() is public
> > >
> > > As I mentionned in my first append, I used two ways to code the
> > > logic:iterate tag.
> > > I can understand the first error message as there is no mention anywhere
> of
> > > the type of "objB" (as "objB" is stored as an Object type in the
> > > Hashtable). But I don't understand the second error message ("invalid
> Cast")
> > > as I specify the type for "objB".
> > >
> > >
> > > ----- Original Message -----
> > > From: "Nicolas De Loof" <[EMAIL PROTECTED]>
> > > To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> > > Sent: Thursday, March 27, 2003 11:27
> > > Subject: Re: Using JSP struts tag logic:iterate
> > >
> > >
> > > > You don't need <jsp:useBean> as struts tags look into scope themself.
> > > (usebean create a scriptlet variable from a bean)
> > > >
> > > > Your code looks fine. Look at objB code, getter should not be well
> formed.
> > > > - be carreful about uppercase beginig properties
> > > > - be carreful not to have mulitple setters with different data types
> > > (IFAIK it will break javaBean PropertyInfo)
> > > > - be carreful getter is public
> > > >
> > > > Nico.
> > > >
> > > >
> > > >
> > > > Hi,
> > > > I'm a bit confusing using the jsp struts tag logic:iterate.
> > > > Here is my problem.
> > > >
> > > > In my business logic I've created an object (let's call it "objA")
> that
> > > contains a Hashtable which itself contain a list
> > > > of objects ("objB") . The Hastable object ("hTable") can be accessed
> > > through getter and setter from "objA".
> > > > I want now to display as a table the property "prop" of all "objB"
> objects
> > > contained in the Hashtable "hTable" ("prop"
> > > > is a String and can be accessed through getter and setter from
> "objB".
> > > >
> > > > Before launching the jsp I've put objA in the HTTP request.
> > > >
> > > > Then I've coded the following in the Jsp :
> > > >
> > > > <jsp:useBean id="objA" class="ObjA" scope="request"></jsp:useBean>
> > > >
> > > > <logic:iterate name="objA" property="hTable" id="objB" indexId="ind" >
> > > > Next element is <bean:write name="objB" property="prop" />
> > > [<bean:write name="ind"/>]
> > > > </logic:iterate>
> > > >
> > > > Coding this, I get the following error :
> > > >
> > > > [Servlet Error]-[No getter method for property prop of bean objB]:
> > > >
> > > >
> > > > I tried then to code :
> > > >
> > > > <jsp:useBean id="objA" class="ObjA" scope="request"></jsp:useBean>
> > > >
> > > > <logic:iterate name="objA" property="hTable" id="objB" indexId="ind"
> > > type="ObjB" >
> > > > Next element is <bean:write name="objB" property="prop" />
> > > [<bean:write name="ind"/>]
> > > > </logic:iterate>
> > > >
> > > > In this case I get the following error :
> > > >
> > > > [Servlet Error]-[JSP 1.2 Processor]: java.lang.ClassCastException:
> > > java.util.Hashtable$Entry
> > > >
> > > > Can anyone tell me what I am doing wrong please ?
> > > >
> > > > Thanks for your help
> > > >
> > > > Jean-Michel Auguste
> > > >
> > > >
> > > >
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