title: How to add functions from custom JARs to EMR cluster?
body: <p>I created an EMR cluster on AWS with Spark and Livy. I submitted a custom JAR with some additional libraries (e.g. datasources for custom formats) as a custom JAR step. However, the stuff from the custom JAR is not available when I try to access it from Livy.</p>
  
  <p>What do I have to do to make the custom stuff available in the environment?</p>