alexxfreitag opened a new issue, #31397: URL: https://github.com/apache/beam/issues/31397
### What happened? Apache Beam version: 2.55.0 Java version: 17 When attempting to read messages with List type headers, a NotSerializableException error is being returned. Example:  If the headers are String, Number, or Boolean, it works normally. I have tried using a CustomCoder with `.setCoder(new CustomCoder())` to try to avoid the headers that are not important in this case, but it appears to throw the error before reaching this coder. Stacktrace: ``` Error message from worker: java.lang.IllegalArgumentException: Unable to encode element 'ValueWithRecordId{id=[], value=org.apache.beam.sdk.io.rabbitmq.RabbitMqMessage@f9a0d014}' with coder 'ValueWithRecordId$ValueWithRecordIdCoder(SerializableCoder(org.apache.beam.sdk.io.rabbitmq.RabbitMqMessage))'. org.apache.beam.sdk.coders.Coder.getEncodedElementByteSize(Coder.java:300) org.apache.beam.sdk.coders.Coder.registerByteSizeObserver(Coder.java:291) org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.registerByteSizeObserver(WindowedValue.java:642) org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.registerByteSizeObserver(WindowedValue.java:558) org.apache.beam.runners.dataflow.worker.IntrinsicMapTaskExecutorFactory$ElementByteSizeObservableCoder.registerByteSizeObserver(IntrinsicMapTaskExecutorFactory.java:384) org.apache.beam.runners.dataflow.worker.util.common.worker.OutputObjectAndByteCounter.update(OutputObjectAndByteCounter.java:128) org.apache.beam.runners.dataflow.worker.DataflowOutputCounter.update(DataflowOutputCounter.java:67) org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process(OutputReceiver.java:48) org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.runReadLoop(ReadOperation.java:218) org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.start(ReadOperation.java:169) org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:83) org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.process(StreamingDataflowWorker.java:1263) org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.lambda$scheduleWorkItem$11(StreamingDataflowWorker.java:999) org.apache.beam.runners.dataflow.worker.streaming.Work.run(Work.java:81) org.apache.beam.runners.dataflow.worker.util.BoundedQueueExecutor.lambda$executeLockHeld$0(BoundedQueueExecutor.java:183) java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) java.base/java.lang.Thread.run(Thread.java:833) Caused by: java.io.NotSerializableException: com.rabbitmq.client.impl.LongStringHelper$ByteArrayLongString java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1187) java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:350) java.base/java.util.ArrayList.writeObject(ArrayList.java:866) java.base/jdk.internal.reflect.GeneratedMethodAccessor62.invoke(Unknown Source) java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.base/java.lang.reflect.Method.invoke(Method.java:568) java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1070) java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1516) java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1438) java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181) java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:350) java.base/java.util.HashMap.internalWriteEntries(HashMap.java:1944) java.base/java.util.HashMap.writeObject(HashMap.java:1497) java.base/jdk.internal.reflect.GeneratedMethodAccessor61.invoke(Unknown Source) java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.base/java.lang.reflect.Method.invoke(Method.java:568) java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1070) java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1516) java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1438) java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181) java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1572) java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1529) java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1438) java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181) java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1572) java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1529) java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1438) java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181) java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:350) org.apache.beam.sdk.coders.SerializableCoder.encode(SerializableCoder.java:192) org.apache.beam.sdk.coders.SerializableCoder.encode(SerializableCoder.java:57) org.apache.beam.sdk.values.ValueWithRecordId$ValueWithRecordIdCoder.encode(ValueWithRecordId.java:106) org.apache.beam.sdk.values.ValueWithRecordId$ValueWithRecordIdCoder.encode(ValueWithRecordId.java:100) org.apache.beam.sdk.values.ValueWithRecordId$ValueWithRecordIdCoder.encode(ValueWithRecordId.java:82) org.apache.beam.sdk.coders.Coder.getEncodedElementByteSize(Coder.java:297) org.apache.beam.sdk.coders.Coder.registerByteSizeObserver(Coder.java:291) org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.registerByteSizeObserver(WindowedValue.java:642) org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.registerByteSizeObserver(WindowedValue.java:558) org.apache.beam.runners.dataflow.worker.IntrinsicMapTaskExecutorFactory$ElementByteSizeObservableCoder.registerByteSizeObserver(IntrinsicMapTaskExecutorFactory.java:384) org.apache.beam.runners.dataflow.worker.util.common.worker.OutputObjectAndByteCounter.update(OutputObjectAndByteCounter.java:128) org.apache.beam.runners.dataflow.worker.DataflowOutputCounter.update(DataflowOutputCounter.java:67) org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process(OutputReceiver.java:48) org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.runReadLoop(ReadOperation.java:218) org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.start(ReadOperation.java:169) org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:83) org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.process(StreamingDataflowWorker.java:1263) org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.lambda$scheduleWorkItem$11(StreamingDataflowWorker.java:999) org.apache.beam.runners.dataflow.worker.streaming.Work.run(Work.java:81) org.apache.beam.runners.dataflow.worker.util.BoundedQueueExecutor.lambda$executeLockHeld$0(BoundedQueueExecutor.java:183) java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) java.base/java.lang.Thread.run(Thread.java:833) ``` ### 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: Spark Runner - [ ] Component: Flink Runner - [ ] Component: Samza Runner - [ ] Component: Twister2 Runner - [ ] Component: Hazelcast Jet Runner - [X] Component: Google Cloud Dataflow Runner -- This is an automated message from the Apache Git Service. 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