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Posted to user@struts.apache.org by Rick Reumann <ma...@reumann.net> on 2002/10/09 00:15:30 UTC

using PropertyUtils with DynaActionForm

According to what I read in the archives I should be able to use the
copyProperties method in PropertyUtils to transfer DynaActionForm
properties to another bean. However, every time I try this, I get the
following thrown as an Exception:

java.lang.NoSuchMethodException: Unknown property 'class'

The code in the Action looks like this:

DynaActionForm f = (DynaActionForm)form;
CheckDTO checkDTO = new CheckDTO();
try {
    PropertyUtils.copyProperties( checkDTO, f );
}
catch( Exception e ) {
    ErrorLogging.info( "ManualVoidAction: insertManualCheck copyProperties: "+e );
}

Any ideas what I could be doing wrong? I searched the Struts archives
and couldn't find much.

Thanks for any help.

-- 

Rick
mailto:maillist@reumann.net


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Re[2]: using PropertyUtils with DynaActionForm

Posted by Rick Reumann <ma...@reumann.net>.
On Tuesday, October 8, 2002, 6:35:35 PM, Eddie wrote:

EB> If both objects have accessors that support the same types,
EB> PropertyUtils should work fine.  If they don't you'll want to use
EB> BeanUtils instead.

    Thanks Eddie, BeanUtils did the trick.

    I'm wondering is it a bad idea to have your value object or DTO
    bean have properties of all Strings that match up exactly with the
    FormBean String properties and then also include your "more
    appropriate" datatypes in this DTO as well that will do the
    conversions from the String properties?

    For example in my DynaActionForm and in my DTO I'd have the
    property

    private String birthDateString

    Then in the DTO I'd also have the regular:

    private Date birthDate;
    with the method:
    getBirthDate() {
       //converts the String birthDateString into a birthDate

    Is it common practice to do the above? It seems to be a nice easy
    way to use the PropertyUtils and also get the conversions you
    need.


EB> BeanUtils.copyProperties(destBean, srcBean);

EB> It'll introspect and do conversions ... and you can register additional 
EB> conversions, if needed.  Check out the javadocs.


-- 

Rick
mailto:maillist@reumann.net


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Re: using PropertyUtils with DynaActionForm

Posted by Eddie Bush <ek...@swbell.net>.
If both objects have accessors that support the same types, 
PropertyUtils should work fine.  If they don't you'll want to use 
BeanUtils instead.

BeanUtils.copyProperties(destBean, srcBean);

It'll introspect and do conversions ... and you can register additional 
conversions, if needed.  Check out the javadocs.

Rick Reumann wrote:

>According to what I read in the archives I should be able to use the
>copyProperties method in PropertyUtils to transfer DynaActionForm
>properties to another bean. However, every time I try this, I get the
>following thrown as an Exception:
>
>java.lang.NoSuchMethodException: Unknown property 'class'
>
>The code in the Action looks like this:
>
>DynaActionForm f = (DynaActionForm)form;
>CheckDTO checkDTO = new CheckDTO();
>try {
>    PropertyUtils.copyProperties( checkDTO, f );
>}
>catch( Exception e ) {
>    ErrorLogging.info( "ManualVoidAction: insertManualCheck copyProperties: "+e );
>}
>
>Any ideas what I could be doing wrong? I searched the Struts archives
>and couldn't find much.
>
>Thanks for any help.
>
-- 
Eddie Bush




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