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From "Josh Wills (JIRA)" <>
Subject [jira] [Updated] (CRUNCH-548) getDetachedValue calls to AvroReflectDeepCopier throw InstantiationException on non-concrete types
Date Wed, 22 Jul 2015 17:47:05 GMT


Josh Wills updated CRUNCH-548:
    Attachment: CRUNCH-548.patch

So would something as simple as this work? I'm wondering if there are some other places in
deep copying where we could switch the focus from the pre-specified target class to the source
object-- what do you think [~gabriel.reid]?

> getDetachedValue calls to AvroReflectDeepCopier throw InstantiationException on non-concrete
> --------------------------------------------------------------------------------------------------
>                 Key: CRUNCH-548
>                 URL:
>             Project: Crunch
>          Issue Type: Bug
>            Reporter: Adric Eckstein
>         Attachments: CRUNCH-548.patch
> A common use case with avro reflection is to operate on an abstract class or interface
which is serialized using a schema based on a concrete subclass (or union of subclasses).
> @org.apache.avro.reflect.Union({ Foo1.class })
> public interface Foo {
> 	public String getFoo();
> }
> public class Foo1 implements Foo {
> 	private final Double value = 1.0;
> 	@Override
> 	public String getFoo() {
> 		return value.toString();
> 	}
> }
> When trying to operate on this type within crunch, calls to getDetachedValue() will throw
an InstantiationException:
> AvroType<Foo> ptype = Avros.reflects(Foo.class, ReflectData.get().getSchema(Foo.class));
> ptype.initialize(new Configuration());
> Foo copy1 = ptype.getDetachedValue(new Foo1());
> Exception in thread "main" org.apache.crunch.CrunchRuntimeException: java.lang.InstantiationException:$Foo
> 	at org.apache.crunch.types.avro.AvroDeepCopier$AvroReflectDeepCopier.createNewInstance(
> One solution would be to augment the createNewInstance() method in AvroReflectDeepCopier
to create a new instance based on the source object class, rather than the type class.  This
would generally be desirable for any union cases where the source is a subclass of the type

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