liupc commented on issue #10269: [FLINK-14876]Putting xercesImpl related classes into alwaysParentFirstLoaderPatterns to avoid conflicts URL: https://github.com/apache/flink/pull/10269#issuecomment-557429329 hi @aljoscha , The hadoop version of our cluster is 2.6, so I changed the `hadoop.version` in the flink-shaded-hadoop-2 project, and compiled it and then use some classes of it in my app. Because the xerces package was introduced into hadoop since 2.6.0(https://issues.apache.org/jira/browse/HDFS-4629), the classes of it was also packaged into my app jar, thus causing the failure. I think if I don't depends on flink-shaded-hadoop-2 but use hadoop deps directly there are risks that this `xercesImpl` would be introduced.
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