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https://issues.apache.org/jira/browse/KAFKA-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Randall Hauch updated KAFKA-4183:
-
Status: Patch Available (was: Open)
Added a [pull request|https://github.com/apache/kafka/pull/1867] with a fix.
The {{JsonConverter}} class has {{LogicalTypeConverter}} implementations for
{{Date}}, {{Time}}, {{Timestamp}}, and {{Decimal}}, but these implementations
fail when the input literal value (deserialized from the message) is null.
Test cases were added to check for these cases, and these failed before the
{{LogicalTypeConverter}} implementations were fixed to consider whether the
schema has a default value or is optional, similarly to how the
{{JsonToConnectTypeConverter}} implementations do this. Once the fixes were
made to the {{LogicalTypeConverter}} implementations, the new tests pass.
> Logical converters in JsonConverter don't properly handle null values
> -
>
> Key: KAFKA-4183
> URL: https://issues.apache.org/jira/browse/KAFKA-4183
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
>Affects Versions: 0.10.0.1
>Reporter: Randall Hauch
>Assignee: Ewen Cheslack-Postava
>
> The {{JsonConverter.TO_CONNECT_LOGICAL_CONVERTERS}} map contains
> {{LogicalTypeConverter}} implementations to convert from the raw value into
> the corresponding logical type value, and they are used during
> deserialization of message keys and/or values. However, these implementations
> do not handle the case when the input raw value is null, which can happen
> when a key or value has a schema that is or contains a field that is
> _optional_.
> Consider a Kafka Connect schema of type STRUCT that contains a field "date"
> with an optional schema of type {{org.apache.kafka.connect.data.Date}}. When
> the key or value with this schema contains a null "date" field and is
> serialized, the logical serializer properly will serialize the null value.
> However, upon _deserialization_, the
> {{JsonConverter.TO_CONNECT_LOGICAL_CONVERTERS}} are used to convert the
> literal value (which is null) to a logical value. All of the
> {{JsonConverter.TO_CONNECT_LOGICAL_CONVERTERS}} implementations will throw a
> NullPointerException when the input value is null.
> For example:
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.kafka.connect.json.JsonConverter$14.convert(JsonConverter.java:224)
> at
> org.apache.kafka.connect.json.JsonConverter.convertToConnect(JsonConverter.java:731)
> at
> org.apache.kafka.connect.json.JsonConverter.access$100(JsonConverter.java:53)
> at
> org.apache.kafka.connect.json.JsonConverter$12.convert(JsonConverter.java:200)
> at
> org.apache.kafka.connect.json.JsonConverter.convertToConnect(JsonConverter.java:727)
> at
> org.apache.kafka.connect.json.JsonConverter.jsonToConnect(JsonConverter.java:354)
> at
> org.apache.kafka.connect.json.JsonConverter.toConnectData(JsonConverter.java:343)
> {code}
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