apparently this happend again for another project. And the issue was my assembly jar was bringing scala-library classes as well. So in my build.sbt i have excluded the scala by the following and that solved the issue. assemblyOption in assembly ~= { _.copy(includeScala = false) }  After this change assembly jar didn't have scala packages, and livy started working ... View more

I faced the same issue till now. When i'm adding my uber jar to livy-rsc-jars I was getting this error. I was able to reproduce this when i placed the jar in spark-client/jars and started spark-shell (spark shell stops with an exception class not found). The problem was i built my uber jar using java-9 in my local and in my spark cluster it is java-8 once i built using java-8 this got resolved.    Regards, Satish Tvv. ... View more