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From "Koji Sekiguchi" <koji.sekigu...@bluemartini.com>
Subject RE: BeanUtils.copyProperties and nested objects
Date Fri, 27 Aug 2004 03:07:27 GMT
I have no idea why you got this error,
you should be able to do this kind of operation
via both:

BeanUtils.copyProperties()
PropertyUtils.copyProperties()

regards,

Koji

> -----Original Message-----
> From: Janne Mattila [mailto:janne4444_63@hotmail.com]
> Sent: Wednesday, August 25, 2004 8:41 PM
> To: commons-user@jakarta.apache.org
> Subject: BeanUtils.copyProperties and nested objects
>
>
> Hi,
>
> I want to use BeanUtils.copyProperties to copy nested objects. My example
> case is:
>
> 	public static class RecordDTO {
> 		private ArtistDTO artist;
> 		private String name;
> 		private int id;
>
> 		...getters & setters
> 	}
>
> 	public static class ArtistDTO {
> 		private String name;
> 		private String firstName;
> 		private int id;
>
>                ...getters and setters
>        }
>
> + a similar structure for objects "Artist" and "Record", that are
> actually
> business objects. When I try to copy a business record to recordDTO with:
>
> ...
> 			Record r = (Record) i.next();
> 			RecordDTO dto  = new RecordDTO();
> 			BeanUtils.copyProperties(dto, r);
>
> I get
>
> 14:08:24,246 ERROR [Engine] ----- Root Cause -----
> java.lang.IllegalArgumentException: argument type mismatch
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorIm
> pl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAc
> cessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:324)
>         at
> org.apache.commons.beanutils.PropertyUtils.setSimpleProperty(Prope
> rtyUtils.java:1789)
>         at
> org.apache.commons.beanutils.BeanUtils.copyProperty(BeanUtils.java:450)
>         at
> org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:264)
>         at cd.action.GetMainAction.testBeanUtils(GetMainAction.java:83)
>
> should I be able to use BeanUtils to do this kind of operation?
>
> I _believe_ I am using version 1.6 of the beanutils jar. At least
> manifest.mf states
>
> Manifest-Version: 1.0
> Created-By: Apache Ant 1.5.1
> Extension-Name: org.apache.commons.beanutils
> Specification-Title: Jakarta Commons Beanutils
> Specification-Vendor: Apache Software Foundation
> Specification-Version: 1.6
> Implementation-Title: org.apache.commons.beanutils
> Implementation-Vendor: Apache Software Foundation
> Implementation-Version: 1.6
>
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