Hi @Jose Gonzalez​ , 

Please see the below spark-submit json and few more examples we have tried with Spark submit parameters

spark-submit json:

{
  "new_cluster": {
    "spark_version": "6.4.x-esr-scala2.11",
    "azure_attributes": {
      "availability": "ON_DEMAND_AZURE",
      "first_on_demand": 1,
      "spot_bid_max_price": -1
    },
    "node_type_id": "Standard_DS3_v2",
    "enable_elastic_disk": true,
    "num_workers": 1
  },
  "spark_submit_task": {
    "parameters": [
      "--class",
      "Bootstrap",
      "--conf",
      "spark.driver.extraClassPath=dbfs:/tmp/",
      "--conf",
      "spark.executor.extraClassPath=dbfs:/tmp/",
      "--files",
      "dbfs:/tmp/application.conf",
      "dbfs:/tmp/code-assembly-0.1.0.jar"
    ]
  },
  "email_notifications": {},
  "name": "application-conf-test",
  "max_concurrent_runs": 1
}

We have tried below spark_submit_task parameters in the above json

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraClassPath=/tmp/application.conf",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraClassPath=/tmp/",
  "--conf",
  "spark.executor.extraClassPath=/tmp/",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraClassPath=dbfs:/tmp/application.conf",
  "--conf",
  "spark.executor.extraClassPath=dbfs:/tmp/application.conf",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraClassPath=dbfs:/tmp/",
  "--conf",
  "spark.executor.extraClassPath=dbfs:/tmp/",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraClassPath=dbfs:./",
  "--conf",
  "spark.executor.extraClassPath=dbfs:./",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--driver-java-options",
  "-Dconfig.file=application.conf",
  "--conf",
  "spark.executor.extraJavaOptions=-Dconfig.file=application.conf",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

[
  "--class",
  "Bootstrap",
  "--conf",
  "spark.driver.extraJavaOptions=-Dconfig.file=application.conf",
  "--conf",
  "spark.executor.extraJavaOptions=-Dconfig.file=application.conf",
  "--files",
  "dbfs:/tmp/application.conf",
  "dbfs:/tmp/code-assembly-0.1.0.jar"
]

For all the above spark_submit_task parameters , we are facing the same below specified error.

Exception in thread "main" com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'db'
	at com.typesafe.config.impl.SimpleConfig.findKey(SimpleConfig.java:124)
	at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:147)
	at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:159)
	at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:164)
	at com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:206)
	at Bootstrap.main(Test.scala:16)
	at Bootstrap.main(Test.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
	at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:845)
	at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:161)
	at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:184)
	at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86)
	at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:920)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:929)

Please can you quickly help on this as we need this implementation