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https://issues.apache.org/jira/browse/KAFKA-9093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963436#comment-16963436
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ASF GitHub Bot commented on KAFKA-9093:
---------------------------------------
guozhangwang commented on pull request #7590: KAFKA-9093: NullPointerException
in KafkaConsumer with group.instance.id
URL: https://github.com/apache/kafka/pull/7590
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> NullPointerException in KafkaConsumer with group.instance.id
> ------------------------------------------------------------
>
> Key: KAFKA-9093
> URL: https://issues.apache.org/jira/browse/KAFKA-9093
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 2.3.0
> Reporter: Rolef Heinrich
> Assignee: huxihx
> Priority: Minor
> Fix For: 2.3.2
>
>
> When using *group.instance.id=myUniqId[0]*, the KafkaConsumer's constructor
> throws a NullpointerException in close():
>
> {code:java}
> Caused by: java.lang.NullPointerException
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2204)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:825)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:664)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:644)
> {code}
> {{It turns out that the exception is thrown because the *log* member is not
> yet initialized (still null) in the constructor when the original exception
> is handled. The original exception is thrown before *log* is initailized.}}
> {{The side effect of this error is, that close does does not cleanup
> resources as clean is supposed to do.}}
> *{{The used consumer properties for reference:}}*
>
> {code:java}
> key.deserializer=com.ibm.streamsx.kafka.serialization....
> request.timeout.ms=25000
> value.deserializer=com.ibm.streamsx.kafka.serialization....
> client.dns.lookup=use_all_dns_ips
> metadata.max.age.ms=2000
> enable.auto.commit=false
> group.instance.id=myUniqId[0]
> max.poll.interval.ms=300000
> group.id=consumer-0
> metric.reporters=com.ibm.streamsx.kafka.clients.consum...
> reconnect.backoff.max.ms=10000
> bootstrap.servers=localhost:9092
> max.poll.records=50
> session.timeout.ms=20000
> client.id=C-J37-ReceivedMessages[0]
> allow.auto.create.topics=false
> metrics.sample.window.ms=10000
> retry.backoff.ms=500
> reconnect.backoff.ms=250{code}
> *Expected behaviour:* throw exception indicating that something is wrong with
> the chosen group.instance.id.
> The documentation does not tell anything about valid values for
> group.instance.id.
> *Reproduce:*
>
>
> {code:java}
>
> import java.util.Properties;
> import org.apache.kafka.clients.consumer.ConsumerConfig;
> import org.apache.kafka.clients.consumer.KafkaConsumer;
> public class Main {
> public static void main(String[] args) {
> Properties props = new Properties();
> props.put (ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
> props.put (ConsumerConfig.GROUP_ID_CONFIG, "group-Id1");
> props.put (ConsumerConfig.GROUP_INSTANCE_ID_CONFIG, "myUniqId[0]");
> props.put (ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
> "org.apache.kafka.common.serialization.StringDeserializer");
> props.put (ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
> "org.apache.kafka.common.serialization.StringDeserializer");
> KafkaConsumer c = new KafkaConsumer (props);
> }
> }
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2204)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:825)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:664)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:644)
> at Main.main(Main.java:15)
> {code}
>
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