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https://issues.apache.org/jira/browse/KAFKA-19198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Schofield resolved KAFKA-19198.
--------------------------------------
    Fix Version/s: 4.1.0
       Resolution: Fixed

> Deletion of topic assigned to a share group can result in NPE
> -------------------------------------------------------------
>
>                 Key: KAFKA-19198
>                 URL: https://issues.apache.org/jira/browse/KAFKA-19198
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Andrew Schofield
>            Assignee: Andrew Schofield
>            Priority: Major
>             Fix For: 4.1.0
>
>
> The problem is that the metadata image may not permit the retrieval of the 
> topic name by topic ID, and that results in an NPE.
> java.util.concurrent.CompletionException: java.lang.NullPointerException: 
> Cannot invoke "org.apache.kafka.image.TopicImage.name()" because the return 
> value of 
> "org.apache.kafka.image.TopicsImage.getTopic(org.apache.kafka.common.Uuid)" 
> is null
> java.util.concurrent.CompletionException: java.lang.NullPointerException: 
> Cannot invoke "org.apache.kafka.image.TopicImage.name()" because the return 
> value of 
> "org.apache.kafka.image.TopicsImage.getTopic(org.apache.kafka.common.Uuid)" 
> is null
>       at 
> java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
>       at 
> java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:347)
>       at 
> java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1141)
>       at 
> java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
>       at 
> java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2194)
>       at 
> org.apache.kafka.coordinator.common.runtime.CoordinatorRuntime$CoordinatorWriteEvent.complete(CoordinatorRuntime.java:1439)
>       at 
> org.apache.kafka.coordinator.common.runtime.CoordinatorRuntime$CoordinatorWriteEvent.run(CoordinatorRuntime.java:1415)
>       at 
> org.apache.kafka.coordinator.common.runtime.MultiThreadedEventProcessor$EventProcessorThread.handleEvents(MultiThreadedEventProcessor.java:147)
>       at 
> org.apache.kafka.coordinator.common.runtime.MultiThreadedEventProcessor$EventProcessorThread.run(MultiThreadedEventProcessor.java:179)
> Caused by: java.lang.NullPointerException: Cannot invoke 
> "org.apache.kafka.image.TopicImage.name()" because the return value of 
> "org.apache.kafka.image.TopicsImage.getTopic(org.apache.kafka.common.Uuid)" 
> is null
>       at 
> org.apache.kafka.coordinator.group.GroupMetadataManager.attachTopicName(GroupMetadataManager.java:5088)
>       at 
> org.apache.kafka.coordinator.group.GroupMetadataManager.addInitializingTopicsRecords(GroupMetadataManager.java:3002)
>       at 
> org.apache.kafka.coordinator.group.GroupMetadataManager.maybeCreateInitializeShareGroupStateRequest(GroupMetadataManager.java:2956)
>       at 
> org.apache.kafka.coordinator.group.GroupMetadataManager.shareGroupHeartbeat(GroupMetadataManager.java:2871)
>       at 
> org.apache.kafka.coordinator.group.GroupMetadataManager.shareGroupHeartbeat(GroupMetadataManager.java:4938)
>       at 
> org.apache.kafka.coordinator.group.GroupCoordinatorShard.shareGroupHeartbeat(GroupCoordinatorShard.java:494)
>       at 
> org.apache.kafka.coordinator.group.GroupCoordinatorService.lambda$shareGroupHeartbeat$6(GroupCoordinatorService.java:453)
>       at 
> org.apache.kafka.coordinator.common.runtime.CoordinatorRuntime$CoordinatorWriteEvent.lambda$run$0(CoordinatorRuntime.java:1392)
>       at 
> org.apache.kafka.coordinator.common.runtime.CoordinatorRuntime.withActiveContextOrThrow(CoordinatorRuntime.java:2151)
>       at 
> org.apache.kafka.coordinator.common.runtime.CoordinatorRuntime$CoordinatorWriteEvent.run(CoordinatorRuntime.java:1390)
>       ... 2 more



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