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https://issues.apache.org/jira/browse/KAFKA-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352034#comment-15352034
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Ismael Juma commented on KAFKA-3905:
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[~wushujames], I agree.
> remove null from subscribed topics in KafkaConsumer#subscribe
> --------------------------------------------------------------
>
> Key: KAFKA-3905
> URL: https://issues.apache.org/jira/browse/KAFKA-3905
> Project: Kafka
> Issue Type: Wish
> Components: clients
> Affects Versions: 0.10.0.0
> Reporter: Xing Huang
> Assignee: Rekha Joshi
> Priority: Minor
>
> Currently, KafkaConsumer's subscribe methods accept Collection<String> as
> topics to be subscribed, but a Collection may have null as its element. For
> example
> {code}
> String topic = null;
> Collection<String> topics = Arrays.asList(topic);
> consumer.subscribe(topics)
> {code}
> When this happens, consumer will throw a puzzling NullPointerException:
> {code}
> at org.apache.kafka.common.utils.Utils.utf8Length(Utils.java:245)
> at org.apache.kafka.common.protocol.types.Type$6.sizeOf(Type.java:248)
> at
> org.apache.kafka.common.protocol.types.ArrayOf.sizeOf(ArrayOf.java:85)
> at org.apache.kafka.common.protocol.types.Schema.sizeOf(Schema.java:89)
> at org.apache.kafka.common.protocol.types.Struct.sizeOf(Struct.java:244)
> at
> org.apache.kafka.common.requests.RequestSend.serialize(RequestSend.java:35)
> at
> org.apache.kafka.common.requests.RequestSend.<init>(RequestSend.java:29)
> at
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.request(NetworkClient.java:616)
> at
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:639)
> at
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:552)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:258)
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.clientPoll(ConsumerNetworkClient.java:360)
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:224)
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:192)
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:163)
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:179)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:970)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:934)
> {code}
> Maybe it's better to remove null when doing subscription.
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