Randall Hauch commented on KAFKA-4183:

[~hachikuji], thanks. I've created a [pull 
request|https://github.com/apache/kafka/pull/1871] for the {{0.10.0}} branch.

> 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:
>            Reporter: Randall Hauch
>            Assignee: Ewen Cheslack-Postava
>             Fix For:
> 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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