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https://issues.apache.org/jira/browse/SPARK-31043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051554#comment-17051554
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Thomas Graves commented on SPARK-31043:
---------------------------------------
I'm working on tracing down what broke this.
[~srowen] looks like [SPARK-30994][CORE] Update xerces to 2.12.0 broke this.
When I revert that it works again.
> Spark 3.0 built against hadoop2.7 can't start standalone master
> ---------------------------------------------------------------
>
> Key: SPARK-31043
> URL: https://issues.apache.org/jira/browse/SPARK-31043
> Project: Spark
> Issue Type: Bug
> Components: Build
> Affects Versions: 3.0.0
> Reporter: Thomas Graves
> Priority: Critical
>
> trying to start a standalone master when building spark branch 3.0 with
> hadoop2.7 fails with:
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/w3c/dom/ElementTraversal
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
> at
> [java.net|http://java.net/]
> .URLClassLoader.defineClass(URLClassLoader.java:468)
> at
> [java.net|http://java.net/]
> .URLClassLoader.access$100(URLClassLoader.java:74)
> at
> [java.net|http://java.net/]
> .URLClassLoader$1.run(URLClassLoader.java:369)
> ...
> Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
> at
> [java.net|http://java.net/]
> .URLClassLoader.findClass(URLClassLoader.java:382)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
> ... 42 more
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