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https://issues.apache.org/jira/browse/SPARK-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337639#comment-14337639
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Apache Spark commented on SPARK-1965:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/4777
> Spark UI throws NPE on trying to load the app page for non-existent app
> -----------------------------------------------------------------------
>
> Key: SPARK-1965
> URL: https://issues.apache.org/jira/browse/SPARK-1965
> Project: Spark
> Issue Type: Bug
> Components: Web UI
> Affects Versions: 1.0.0
> Reporter: Kay Ousterhout
> Priority: Minor
>
> If you try to load the Spark UI for an application that doesn't exist:
> sparkHost:8080/app/?appId=foobar
> The UI throws a NPE. The problem is in ApplicationPage.scala -- Spark
> proceeds even if the "app" variable is null. We should handle this more
> gracefully.
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