I have the exact same problem. Spark 2.2.0.cloudera1.   Can you please tell me what's wrong with this code? It's the easiest Java version of the example code in Spark's Javadoc example (here).   The code:   List<Row> rows = new ArrayList<>(); Object[] cols = new Object[2]; cols[0] = "one"; cols[1] = 1; rows.add(RowFactory.create(cols)); spark.createDataFrame(rows, st).write().format("parquet").mode(SaveMode.Overwrite).saveAsTable("my_scheme.my_table");   rows = new ArrayList<>(); cols[0] = "two"; cols[1] = 2; rows.add(RowFactory.create(cols)); spark.createDataFrame(rows, st).write().format("parquet").mode(SaveMode.Append).saveAsTable("my_scheme.my_table");     The error:   java.lang.IllegalArgumentException: Expected exactly one path to be specified, but got:         at org.apache.spark.sql.execution.datasources.DataSource.writeInFileFormat(DataSource.scala:410)         at org.apache.spark.sql.execution.datasources.DataSource.writeAndRead(DataSource.scala:454)         at org.apache.spark.sql.execution.command.CreateDataSourceTableAsSelectCommand.saveDataIntoTable(createDataSourceTables.scala:198)         at org.apache.spark.sql.execution.command.CreateDataSourceTableAsSelectCommand.run(createDataSourceTables.scala:148)         at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:58)         at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:56)         at org.apache.spark.sql.execution.command.ExecutedCommandExec.doExecute(commands.scala:74)         at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:117)         at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:117)         at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:138)         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)         at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:135)         at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:116)         at org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:92)         at org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:92)         at org.apache.spark.sql.DataFrameWriter.runCommand(DataFrameWriter.scala:610)         at org.apache.spark.sql.DataFrameWriter.createTable(DataFrameWriter.scala:420)         at org.apache.spark.sql.DataFrameWriter.saveAsTable(DataFrameWriter.scala:399)         at org.apache.spark.sql.DataFrameWriter.saveAsTable(DataFrameWriter.scala:354)   ... View more