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From "Henri Yandell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (BEANUTILS-281) BeanUtils.cloneBean and Covariant (Overriding) return types
Date Wed, 06 Jun 2007 15:20:26 GMT

     [ https://issues.apache.org/jira/browse/BEANUTILS-281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Henri Yandell updated BEANUTILS-281:
------------------------------------

    Fix Version/s: LATER THAN 1.8.0

I doubt we'll do anything about this in 1.8.0 as covariant return types are a JDK 1.5 feature
and I'm sure 1.8.0 won't be 1.5 dependent. It's possible the feature could be added without
using 1.5, but I suspect the code requiring change would turn out to be in java.beans.

> BeanUtils.cloneBean and Covariant (Overriding) return types
> -----------------------------------------------------------
>
>                 Key: BEANUTILS-281
>                 URL: https://issues.apache.org/jira/browse/BEANUTILS-281
>             Project: Commons BeanUtils
>          Issue Type: Bug
>          Components: Bean / Property Utils
>         Environment: JDK1.5
>            Reporter: Onur Kutlu GAGO
>             Fix For: LATER THAN 1.8.0
>
>
> BeanUtils.cloneBean(Object) method does not copy the fields that are overriden by the
subclasses. For example, consider an abstract class(AbstractVehicle) where you define an abstract
getter for a field. 
> **************************
> public abstract class AbstractVehicle {
> 	public abstract Serializable getField();
> }
> ***************************
> In a class (Car) that extends this abstract class (AbstractVehicle) you define the field
itself and override the return type of the getter method (from Serializable to Integer):
> ***************************
> public class Car extends AbstractVehicle {
> 	private Integer field = null;
> 	@Override
> 	public Integer getField() {
> 		return field;
> 	}
> 	public void setField(Integer field) {
> 		this.field = field;
> 	}
> }
> ***************************
> When you clone such objects (Car) this field is not copied! The following code prints
'null' instead of 5!
> ***************************
> public class CopyTestMain {
> 	public static void main(String[] args) throws IllegalAccessException, InstantiationException,
InvocationTargetException, NoSuchMethodException {
> 		final Car aCar = new Car();
> 		aCar.setField(5);
> 		final Car copyCar = (Car) BeanUtils.cloneBean(aCar);
> 		System.out.println("Field = " + copyCar.getField());
> 	}
> }
> ***************************

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