Rasmus Helbig Hansen created KAFKA-12963:
--------------------------------------------
Summary: Improve error message for Class cast exception
Key: KAFKA-12963
URL: https://issues.apache.org/jira/browse/KAFKA-12963
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 2.7.0
Reporter: Rasmus Helbig Hansen
After a topology change and starting the application again, we got this type of
error message:
{noformat}
[g9z-StreamThread-1] ERROR
org.apache.kafka.streams.processor.internals.TaskManager - stream-thread
[g9z-StreamThread-1] Failed to process stream task 1_12 due to the following
error:org.apache.kafka.streams.errors.StreamsException: ClassCastException
invoking Processor. Do the Processor's input types match the deserialized
types? Check the Serde setup and change the default Serdes in StreamConfig or
provide correct Serdes via method parameters. Make sure the Processor can
accept the deserialized input of type key: org.acme.SomeKey, and value:
org.acme.SomeValue.Note that although incorrect Serdes are a common cause of
error, the cast exception might have another cause (in user code, for example).
For example, if a processor wires in a store, but casts the generics
incorrectly, a class cast exception could be raised during processing, but the
cause would not be wrong Serdes. at
org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:185)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forwardInternal(ProcessorContextImpl.java:273)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:252)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:219)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:172)
at
org.apache.kafka.streams.kstream.internals.KStreamJoinWindow$KStreamJoinWindowProcessor.process(KStreamJoinWindow.java:55)
at
org.apache.kafka.streams.processor.internals.ProcessorAdapter.process(ProcessorAdapter.java:71)
at
org.apache.kafka.streams.processor.internals.ProcessorNode.lambda$process$2(ProcessorNode.java:181)
at
org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl.maybeMeasureLatency(StreamsMetricsImpl.java:883)
at
org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:181)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forwardInternal(ProcessorContextImpl.java:273)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:252)
at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:219)
at
org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:86)
at
org.apache.kafka.streams.processor.internals.StreamTask.lambda$process$1(StreamTask.java:703)
at
org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl.maybeMeasureLatency(StreamsMetricsImpl.java:883)
at
org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:703)
at
org.apache.kafka.streams.processor.internals.TaskManager.process(TaskManager.java:1105)
at
org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:647)
at
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:553)
at
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:512)Caused
by: java.lang.ClassCastException: class org.acme.SomeValue cannot be cast to
class org.acme.OtherValue (org.acme.SomeValue and org.acme.OtherValue are in
unnamed module of loader 'app') at
org.apache.kafka.streams.kstream.internals.KStreamKStreamJoin$KStreamKStreamJoinProcessor.process(KStreamKStreamJoin.java:112)
at
org.apache.kafka.streams.processor.internals.ProcessorAdapter.process(ProcessorAdapter.java:71)
at
org.apache.kafka.streams.processor.internals.ProcessorNode.lambda$process$2(ProcessorNode.java:181)
at
org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl.maybeMeasureLatency(StreamsMetricsImpl.java:883)
at
org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:181){noformat}
It doesn't give enough context, like processor name and topic, which made
troubleshooting unnecessary tricky.
Very similar to KAFKA-8884 which was fixed in 2.4.0. It seems like a regression.
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