https://community.cloudera.com/t5/Support-Questions/java-lang-ClassCastException-org-apache-xerces-parsers/m-p/151762#M114241 <P>I believe this is usually a conflict between versions of xerces. There is a xerces JAR in the nifi-hadoop-libraries-nar, is your NAR declaring that as a dependency? If so then you might need to exclude xerces from it or your own dependencies, in order to ensure there's only a single version/impl.</P> Wed, 22 Jun 2016 21:04:24 GMT mburgess 2016-06-22T21:04:24Z