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From Niall Pemberton <niall.pember...@gmail.com>
Subject Re: Setting null on Integer property via BeanUtils.setProperty
Date Wed, 09 Dec 2009 11:54:01 GMT
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
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> -----------------------------------------------
> -----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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