Objects in the form

[Jesse Vitrone <je...@vitalworks.com>]

I just started looking at putting an object in the form, then in the jsp
use:
 
<html:text property="object.field"/>
 
The only problem I'm running into is that if the object is null, then Struts
can't set it when I submit.
 
That's not a big deal for the object, because I can just init it in the
form, but for objects on objects, that means I have to init them all on my
beans, which I don't want to do since we check to see if things are null to
see if they've been set before.
 
Has anyone else run into this problem?  Why doesn't Struts / Bean Commons
just check for null and create a new instance if it's null?  Are there
issues with doing that?
 
Thanks in advance,
    Jesse

Re: Objects in the form

[Florian Convers <fc...@webnet.fr>]

Maybe because the bean property
which itself contain a bean is private member
And action servlet just have access to the getter

But you could maybe implement instance creation in your getter


----- Original Message -----
From: "Jesse Vitrone" <je...@vitalworks.com>
To: <st...@jakarta.apache.org>
Sent: Monday, April 14, 2003 5:18 PM
Subject: Objects in the form


I just started looking at putting an object in the form, then in the jsp
use:

<html:text property="object.field"/>

The only problem I'm running into is that if the object is null, then Struts
can't set it when I submit.

That's not a big deal for the object, because I can just init it in the
form, but for objects on objects, that means I have to init them all on my
beans, which I don't want to do since we check to see if things are null to
see if they've been set before.

Has anyone else run into this problem?  Why doesn't Struts / Bean Commons
just check for null and create a new instance if it's null?  Are there
issues with doing that?

Thanks in advance,
    Jesse



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RE: Objects in the form

[Jesse Vitrone <je...@vitalworks.com>]

This is what I meant - if I add this code:

if (value == null) {
    try {
        Method writeMethod = getWriteMethod(descriptor);
        if (writeMethod == null) {
            throw new NoSuchMethodException("Property '" + name +
                    "' has no setter method");
        }

        value = readMethod.getReturnType().newInstance();
        writeMethod.invoke(bean, new Object[] {value});

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

To the bottom of commons org.apache.commons.beanutils.PropertyUtils.java,
everything works like I want it to.  If the bean on my form is not
initialized, it creates me a new one, and sets in on the form.

Would other people find something like this useful?  That way, if I have a
Person who's info is being submitted, I can just have a Person on my form,
and property="person.firstName" in my htm:form, and all my Person info is
set for me, and then back in my Action class, I have my Person object to
save.

Granted, if I init my Person in my form, it'd work with no code change, but
that means all my objects everywhere would need to be initialized.  That's a
lot of object creation when we don't need it.  Keep in mind, I don't just
mean the objects on the forms, IE - all the objects on my Person would need
to be initialized too, or else Struts / Commons will get a null when it
tries to set those.  So I'm trying to be able to do this w/o having to init
all those objects.

Would anyone else find this useful?  Do you think there should be a flag or
something we can set somewhere that tells Struts / Commons to do this?


Jesse


-----Original Message-----
From: Jesse Vitrone [mailto:jessevitrone@vitalworks.com] 
Sent: Monday, April 14, 2003 11:19 AM
To: struts-user@jakarta.apache.org
Subject: Objects in the form


I just started looking at putting an object in the form, then in the jsp
use:
 
<html:text property="object.field"/>
 
The only problem I'm running into is that if the object is null, then Struts
can't set it when I submit.
 
That's not a big deal for the object, because I can just init it in the
form, but for objects on objects, that means I have to init them all on my
beans, which I don't want to do since we check to see if things are null to
see if they've been set before.
 
Has anyone else run into this problem?  Why doesn't Struts / Bean Commons
just check for null and create a new instance if it's null?  Are there
issues with doing that?
 
Thanks in advance,
    Jesse


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