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https://issues.apache.org/jira/browse/BEANUTILS-281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512268
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Henri Yandell commented on BEANUTILS-281:
-----------------------------------------
Just to follow up more on this issue, the type of which I've seen crop up in
Spring and Hibernate too:
http://opensource.atlassian.com/projects/spring/browse/SPR-2727
http://opensource.atlassian.com/projects/hibernate/browse/HHH-442
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2268
http://opensource.atlassian.com/projects/spring/browse/SPR-2968
The real bug is down in PropertyUtils.getPropertyDescriptors(Class). If you
evoke that on Car.class, it considers that the
AbstractVehicle.getField();Serializable class it the read method [wrong], and
that there is no write method [wrong]. Basically it gives the result you would
expect from evoking it on AbtractVehicle.class.
This is due to errors in the data returned from
Introspector.getBeanInfo(Car.class).getPropertyDescriptors().
The solution is most likely to write our own version of the Introspector's
getBeanInfo method:
http://java.sun.com/j2se/1.5.0/docs/api/java/beans/Introspector.html#getBeanInfo(java.lang.Class)
> 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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