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https://issues.apache.org/jira/browse/CRUNCH-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054577#comment-14054577
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Gabriel Reid commented on CRUNCH-442:
-------------------------------------
This was fixed in CRUNCH-289, but it looks like it broke shortly thereafter
(for the default situation) in CRUNCH-293. Unfortunately, it's difficult
(nearly impossible) to test this one in automated testing because it would
require a lot of messing around with class loaders.
I think that it should work for now if you make the following call before you
attempt to materialize your PCollection:
{code}AvroMode.setSpecificClassLoader(MySpecificAvro.class.getClassLoader());{code}
Can you confirm that that solves it?
In any case, I don't think it should be necessary to make that call explicitly,
so I'll try to put something together to make this work without the explicit
setSpecificClassLoader call.
> Trying to read specific avros, getting ClassCastException
> ---------------------------------------------------------
>
> Key: CRUNCH-442
> URL: https://issues.apache.org/jira/browse/CRUNCH-442
> Project: Crunch
> Issue Type: Bug
> Components: IO
> Affects Versions: 0.10.0
> Reporter: Jason Gauci
>
> I have code that looks like this:
> ArrayList<MySpecificAvro> data =
> Lists.newArrayList(pipeline.read(From.avroFile(
> "/user/jgauci/data.avro",
>
> Avros.specifics(MySpecificAvro.class))).materialize());
> for (MySpecificAvro msa : data) {
> System.out.println(msa.getName());
> }
> And I get this error:
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.avro.generic.GenericData$Record cannot be cast to MySpecificAvro
> The error fires inside the for loop after the materialize has completed.
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