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From: "Neha Narkhede (JIRA)" <jira@apache.org>
To: dev@kafka.apache.org
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Subject: [jira] [Resolved] (KAFKA-690) TopicMetadataRequest throws exception
 when no topics are specified
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     [ https://issues.apache.org/jira/browse/KAFKA-690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neha Narkhede resolved KAFKA-690.
---------------------------------

    Resolution: Fixed
      Assignee: David Arthur
    
> TopicMetadataRequest throws exception when no topics are specified
> ------------------------------------------------------------------
>
>                 Key: KAFKA-690
>                 URL: https://issues.apache.org/jira/browse/KAFKA-690
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8
>            Reporter: David Arthur
>            Assignee: David Arthur
>             Fix For: 0.8
>
>         Attachments: KAFKA-690.patch
>
>
> If no topics are sent in a TopicMetadataRequest, `readFrom` throws an exception when trying to get the the head of the topic list for a debug statement.
> java.util.NoSuchElementException: head of empty list
> 	at scala.collection.immutable.Nil$.head(List.scala:386)
> 	at scala.collection.immutable.Nil$.head(List.scala:383)
> 	at kafka.api.TopicMetadataRequest$$anonfun$readFrom$2.apply(TopicMetadataRequest.scala:43)
> 	at kafka.api.TopicMetadataRequest$$anonfun$readFrom$2.apply(TopicMetadataRequest.scala:43)
> 	at kafka.utils.Logging$class.debug(Logging.scala:51)
> 	at kafka.api.TopicMetadataRequest$.debug(TopicMetadataRequest.scala:25)
> 	at kafka.api.TopicMetadataRequest$.readFrom(TopicMetadataRequest.scala:43)
> 	at kafka.api.RequestKeys$$anonfun$4.apply(RequestKeys.scala:37)
> 	at kafka.api.RequestKeys$$anonfun$4.apply(RequestKeys.scala:37)
> 	at kafka.network.RequestChannel$Request.<init>(RequestChannel.scala:47)
> 	at kafka.network.Processor.read(SocketServer.scala:320)
> 	at kafka.network.Processor.run(SocketServer.scala:231)
> 	at java.lang.Thread.run(Thread.java:680)

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