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https://issues.apache.org/jira/browse/SPARK-29087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-29087:
----------------------------------
    Component/s: Spark Core

> Use DelegatingServletContextHandler to avoid CCE
> ------------------------------------------------
>
>                 Key: SPARK-29087
>                 URL: https://issues.apache.org/jira/browse/SPARK-29087
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core, Structured Streaming
>    Affects Versions: 2.4.0, 3.0.0
>            Reporter: Dongjoon Hyun
>            Priority: Major
>
> SPARK-27122 fixes `ClassCastException` at `yarn` module by using 
> `DelegatingServletContextHandler`. Initially, this was discovered with JDK9+, 
> but the class path issues affected in JDK8, too. This issue aims to fix 
> `streaming` module.
> {code}
> $ build/mvn test -pl streaming
> ...
> UISeleniumSuite:
> - attaching and detaching a Streaming tab *** FAILED ***
>   java.lang.ClassCastException: 
> org.sparkproject.jetty.servlet.ServletContextHandler cannot be cast to 
> org.eclipse.jetty.servlet.ServletContextHandler
> ...
> Tests: succeeded 337, failed 1, canceled 0, ignored 1, pending 0
> *** 1 TEST FAILED ***
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO] 
> ------------------------------------------------------------------------
> {code}



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