ahmedabu98 opened a new issue, #32701:
URL: https://github.com/apache/beam/issues/32701
### What happened?
I have an @AutoValue class with the `@DefaultSchema(AutoValueSchema.class)`.
One of the getters/setters is a `Map<Integer, ByteBuffer>`. When using elements
of this class in my pipeline, I get the following error:
<details>
<summary>Error stack trace</summary>
```
java.lang.ClassCastException: class [B cannot be cast to class
java.nio.ByteBuffer ([B and java.nio.ByteBuffer are in module java.base of
loader 'bootstrap')
at
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Function$SchemaCodeGen$sIwEd1pP.apply(Unknown
Source)
at
org.apache.beam.sdk.schemas.utils.ByteBuddyUtils$TransformingMap.<init>(ByteBuddyUtils.java:525)
at
org.apache.beam.sdk.schemas.utils.ByteBuddyUtils.getTransformingMap(ByteBuddyUtils.java:508)
at
org.apache.beam.sdk.io.iceberg.FieldValueGetter$SchemaCodeGen$c6I5wjZP.get(Unknown
Source)
at
org.apache.beam.sdk.io.iceberg.FieldValueGetter$SchemaCodeGen$c6I5wjZP.get(Unknown
Source)
at
org.apache.beam.sdk.values.RowWithGetters$1.apply(RowWithGetters.java:82)
at
org.apache.beam.sdk.values.RowWithGetters$1.apply(RowWithGetters.java:75)
at java.base/java.util.Map.computeIfAbsent(Map.java:1003)
at
org.apache.beam.sdk.values.RowWithGetters.getValue(RowWithGetters.java:73)
at
org.apache.beam.sdk.coders.RowCoderGenerator$EncodeInstruction.encodeDelegate(RowCoderGenerator.java:419)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$w90nPOHK.encode(Unknown
Source)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$w90nPOHK.encode(Unknown
Source)
at org.apache.beam.sdk.schemas.SchemaCoder.encode(SchemaCoder.java:121)
at
org.apache.beam.sdk.coders.RowCoderGenerator$EncodeInstruction.encodeDelegate(RowCoderGenerator.java:437)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$1ANxtLai.encode(Unknown
Source)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$1ANxtLai.encode(Unknown
Source)
at org.apache.beam.sdk.schemas.SchemaCoder.encode(SchemaCoder.java:121)
at org.apache.beam.sdk.coders.Coder.encode(Coder.java:135)
at
org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:86)
at
org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:70)
at
org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:55)
at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:168)
at
org.apache.beam.runners.direct.CloningBundleFactory$CloningBundle.add(CloningBundleFactory.java:87)
at
org.apache.beam.runners.direct.FlattenEvaluatorFactory$FlattenEvaluator.processElement(FlattenEvaluatorFactory.java:75)
at
org.apache.beam.runners.direct.DirectTransformExecutor.processElements(DirectTransformExecutor.java:165)
at
org.apache.beam.runners.direct.DirectTransformExecutor.run(DirectTransformExecutor.java:129)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
```
</details>
I think I was able to track the problem down to this code in ByteBuddy:
https://github.com/apache/beam/blob/e4ab66da4cc716f25f2f17c4183ed810c56ea269/sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/utils/ByteBuddyUtils.java#L1113-L1125
From what I understand, Beam does some conversions between `ByteBuffer` and
`byte[]` (for reasons I am not aware of). In the above code, the Map's key and
value element types are not transparent. Instead, they show up as generics.
Because of this, we never enter the `if` block, which contains code that
applies conversion logic.
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [X] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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