[KAFKA-5620] SerializationException in doSend() masks class cast exception

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.11.0.0
• Fix Version/s: 1.0.0
• Assignee: Jeremy Custenborder
• Reporter: Jeremy Custenborder
• Created: 20/Jul/17 16:43
• Updated: 26/Aug/17 23:09
• Resolved: 26/Aug/17 23:08

Description

I misconfigured my Serializer and passed a byte array to BytesSerializer. This caused the following exception to be thrown.

org.apache.kafka.common.errors.SerializationException: Can't convert value of class [B to class org.apache.kafka.common.serialization.BytesSerializer specified in value.serializer

This doesn't provide much detail because it strips the ClassCastException. It made figuring this out much more difficult. The real value was the inner exception which was:

[B cannot be cast to org.apache.kafka.common.utils.Bytes

We should include the ClassCastException.

Issue Links

• links to: GitHub Pull Request #3556