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From "Syed Muhammad Humayun" <smhuma...@iblgrp.com>
Subject RE: Setting null on Integer property via BeanUtils.setProperty
Date Wed, 09 Dec 2009 12:36:35 GMT
Yes, I tried that too but it didn't work.

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S M Humayun
Software Architect, IBL Group
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-----Original Message-----
From: Niall Pemberton [mailto:niall.pemberton@gmail.com] 
Sent: Wednesday, December 09, 2009 4:54 PM
To: Commons Users List
Subject: Re: Setting null on Integer property via BeanUtils.setProperty

On Wed, Dec 9, 2009 at 11:22 AM, Syed Muhammad Humayun
<smhumayun@iblgrp.com> wrote:
> Niall,
>
> Thanx for the help. I did following as a work around:
>
> PropertyUtils.getWriteMethod(PropertyUtils.getPropertyDescriptor(this,
> propertyName)).invoke(this, new Object[]{null});

Why not just use

   PropertyUtils.setProperty(bean, propertyName, null);

Niall

> Regards,
>
> -----------------------------------------------
> S M Humayun
> Software Architect, IBL Group
> -----------------------------------------------
> Cell : 92.321.8707783
> Email (Official) : smhumayun@iblgrp.com Email (Personal) : 
> smhumayun@gmail.com Google Talk : smhumayun@gmail.com MSN : 
> smhumayun2001@hotmail.com Yahoo : humayun_reports@yahoo.com Skype : 
> smhumayun AIM : syedmohdhumayun Blog : http://smhumayun.blogspot.com 
> LinkedIn : http://www.linkedin.com/in/smhumayun
> Facebook : http://www.facebook.com/smhumayun Twitter : 
> http://twitter.com/smhumayun Flickr : 
> http://www.flickr.com/photos/smhumayun
> YouTube : http://www.youtube.com/user/smhumayun
> -----------------------------------------------
> -----Original Message-----
> From: Niall Pemberton [mailto:niall.pemberton@gmail.com]
> Sent: Wednesday, December 09, 2009 4:18 PM
> To: Commons Users List
> Subject: Re: Setting null on Integer property via 
> BeanUtils.setProperty
>
> On Wed, Dec 9, 2009 at 10:06 AM, Syed Muhammad Humayun 
> <smhumayun@iblgrp.com> wrote:
>> Hi,
>>
>> How can I set a 'null' on Integer property (or any other wrappers 
>> like Double, Long, Character etc) via BeanUtils.setProperty? If its 
>> not possible this way than is there any other way using apache commons ?
>
> If you don't want "conversion" then you can use
> org.apache.commons.beanutils.PropertyUtils.setProperty() method - but 
> the "value" object has to be the correct type (or null).
>
> For PropertyUtils see: http://tinyurl.com/yf9f6wk
>
> BeanUtils adds conversion to PropertyUtils  - it tries to convert the 
> value you specified to the correct type of the the bean's property.
> These converters have behaviour defined on how to handle "null" values 
> and operate in two modes:
>  - throw an exception
>  - use a default value
>
> The default set of converters which are "registered" with BeanUtils 
> have a default value specified - so for example the converter 
> registered for Integer types has a default value of zero. This is why 
> you can't set a "null" value at the moment. If you want null values to 
> be set then you need to register converter implementations for those 
> types with a default value of null. So for example you would do something
like...
>
>  ConvertUtils.register(new IntegerConverter(null), Integer.class);
>  ConvertUtils.register(new DoubleConverter(null), Double.class);
>
> (Note: the "null" value in the constructors is the default value)
>
> For ConvertUtils see: http://tinyurl.com/ydhq85s For converters see:
> http://tinyurl.com/yl2pl2q
>
> Niall
>
>> Regards,
>
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