FW: PropertyUtils.copyProperties() usage in 1.1-b2

[Brian Topping <to...@digidemic.com>]

This didn't seem to get much interest on struts-user except from Craig, so I
thought I would move the question over here.

Any thoughts appreciated, not sure what I am doing wrong, but down at the
bottom, I think I've dissected this problem pretty well.

Thanks for any consideration,

-b

-----Original Message-----
From: Brian Topping 
Sent: Sunday, November 17, 2002 3:20 AM
To: Struts Users Mailing List
Subject: RE: PropertyUtils.copyProperties() usage in 1.1-b2


Craig, Rana,

thanks for your responses, hoping you guys can provide some input:

> From: Craig R. McClanahan [mailto:craigmcc@apache.org]
> Subject: Re: PropertyUtils.copyProperties() usage in 1.1-b2
> 
> > I'm trying to figure out what I am doing wrong with
> > PropertyUtils.copyProperties().  From within my Action, I have:
> >
> >     User user = <bean>;
> >     DynaActionForm regForm = (DynaActionForm) form;
> >     PropertyUtils.copyProperties(regForm, user);
> >
> > When I look at what copyProperties is doing, it's getting a
> > PropertyDescriptor array from getPropertyDescriptors() with the user
> > bean correctly, then it iteratively tries to see if the 
> regForm has any
> > of the properties found in the user bean.  But calling
> > getPropertyDescriptor(regForm, <fieldname>) seems to be 
> comparing the
> > (correct) field names from the bean against the *structure* of the
> > DynaActionForm component (i.e. the multipartRequestHandler, 
> dynaClass,
> > servlet, etc), instead of the DynaFields that I set up in my
> > <form-bean/>.
> >
> 
> Which CVS version number of PropertyUtils are you looking at 
> (second line
> of the sources?  The version I'm looking at, 1.32 (i.e. the current
> nightly builds), does not call getPropertyDescriptors() on a DynaBean.

K, here's what I'm seeing under PropertyUtils 1.32:

in copyProperties:

orig is neither Map nor DynaBean, so line 283 calls
getPropertyDescriptors(orig).  Then, for each readMethod in the result, line
296 has:

   String name = origDescriptors[i].getName();
   if (getPropertyDescriptor(dest, name) != null) {

But getting into getPropertyDescriptor(), line 869 calls
getPropertyDescriptors(bean).  If the dest is a DynaBean, I'm not seeing
where the "instanceof DynaBean" is -- it simply calls
Introspector.getBeanInfo().getPropertyDescriptors(), but the result of
getBeanInfo doesn't know anything about DynaBeans.

What am I missing here?  Rana says this is working and appreciate his input,
especially with the release notes reference (thanks!)  But tracing through
the code and triple-checking at the beans (they both have a "name" property),
I still can't see how this is going to work, and in practice, the destination
DynaBean is untouched.

Thanks again,

-b

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