Github user prabhjyotsingh commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/827#issuecomment-220059254 @Leemoonsoo can you try one of this `curl -X POST --data '{"kind": "spark", "master": "local[*]", "proxyUser": "null"}' -H "Content-Type: application/json" localhost:8998/sessions` if trying on https://github.com/cloudera/hue/tree/master/apps/spark/java or `curl -X POST --data '{"kind": "spark", "conf":{"spark.master": "local[*]"},"proxyUser": "null"}' -H "Content-Type: application/json" localhost:8998/sessions` if on https://github.com/cloudera/livy. Most likely this is known issue https://github.com/apache/incubator-zeppelin/pull/827/commits/3deca713f638e8908974c45891d4ed152a55cda9#diff-427ba78b970ccdf0a95f5176f693a377R88 and your server is running from https://github.com/cloudera/livy.
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