Hadoop version is 2.6.0-cdh.5.8.3.  Spark version is 1.6.0 with Scala version 2.10.5   I trying to do a simple SQL query to the remote Oracle 11g DB by using Spark SQL in spark-shell.   val jdbcDF = sqlContext.read.format("jdbc").options( Map("url" -> "jdbc:oracle:thin:system/system@db-host:1521:orcl", "dbtable"-> "schema_name.table_name", "driver"-> "oracle.jdbc.OracleDriver", "username" -> "user", "password" -> "pwd")).load() the result is:   java.util.NoSuchElementException: key not found: scale at scala.collection.MapLike$class.default(MapLike.scala:228) at scala.collection.AbstractMap.default(Map.scala:58) at scala.collection.MapLike$class.apply(MapLike.scala:141) at scala.collection.AbstractMap.apply(Map.scala:58) at org.apache.spark.sql.types.Metadata.get(Metadata.scala:108) at org.apache.spark.sql.types.Metadata.getLong(Metadata.scala:51) at org.apache.spark.sql.jdbc.OracleDialect$.getCatalystType(OracleDialect.scala:33) at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$.resolveTable(JDBCRDD.scala:140) at org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation.<init>(JDBCRelation.scala:91) at org.apache.spark.sql.execution.datasources.jdbc.DefaultSource.createRelation(DefaultSource.scala:57) at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:158) at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:119) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:25) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:30) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:32) at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:34) at $iwC$$iwC$$iwC$$iwC.<init>(<console>:36) at $iwC$$iwC$$iwC.<init>(<console>:38) at $iwC$$iwC.<init>(<console>:40) at $iwC.<init>(<console>:42) at <init>(<console>:44) at .<init>(<console>:48) at .<clinit>(<console>) at .<init>(<console>:7) at .<clinit>(<console>) at $print(<console>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1045) at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1326) at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:821) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:852) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:800) at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857) at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902) at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814) at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657) at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1064) at org.apache.spark.repl.Main$.main(Main.scala:31) at org.apache.spark.repl.Main.main(Main.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Can someone tell me, what is the reason of such error? ... View more