Logan Donoughe created AVRO-3791:
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Summary: [Java] "Found null, expecting <Type>" error should
specify field to user
Key: AVRO-3791
URL: https://issues.apache.org/jira/browse/AVRO-3791
Project: Apache Avro
Issue Type: Improvement
Components: java
Reporter: Logan Donoughe
When working with Avro and Flink, I've run into errors like this fairly often:
{code:java}
java.io.IOException: Failed to deserialize consumer record due to
...
Caused by: org.apache.avro.AvroTypeException: Found null, expecting string
at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:308)
{code}
At a glance, this is not particularly useful. I know that some field is getting
a null where there is a non-nullable string but in order to find out which one
it is I either have to check all possible non-null string fields for null
values, look at which columns are changed recently and guess and check, or
throw a debugger in and dive down the stack. So far, the last has been the
fastest for me.
Ideally, I would like the error message to tell me which field has the null
value so I can fix the problem with high confidence and without the use of a
debugger.
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