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Q: Spark SQL Java GenericRowWithSchema cannot be cast to java.lang.String I have an application that's attempting to read a group of csv from a cluster dir and write them as parquet file using Spark. SparkSession sparkSession = createSession(); JavaRDD<Row> entityRDD = sparkSession.read() .csv(dataCluster + "measures/measures-*.csv") .javaRDD() .mapPartitionsWithIndex(removeHeader, false) .map((Function<String, Measure>) s -> { String[] parts = s.split(COMMA); Measure measure = new Measure(); measure.setCobDate(parts[0]); measure.setDatabaseId(Integer.valueOf(parts[1])); measure.setName(parts[2]); return measure; }); Dataset<Row> entityDataFrame = sparkSession.createDataFrame(entityRDD, Measure.class); entityDataFrame.printSchema(); //Create parquet file here String parquetDir = dataCluster + "measures/parquet/measures"; entityDataFrame.write().mode(SaveMode.Overwrite).parquet(parquetDir); sparkSession.stop(); The Measure class is a simple POJO that implements Serializable. The schema is printed so there must be a problem translating the DataFrame entries to the parquet file. Here's the error I get: Lost task 2.0 in stage 1.0 (TID 3, redlxd00006.nomura.com, executor 1): org.apache.spark.SparkException: Task failed while writing rows at org.apache.spark.sql.execution.datasources.FileFormatWriter$.org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask(FileFormatWriter.scala:204) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1$$anonfun$3.apply(FileFormatWriter.scala:129) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1$$anonfun$3.apply(FileFormatWriter.scala:128) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87) at org.apache.spark.scheduler.Task.run(Task.scala:99) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassCastException: org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema cannot be cast to java.lang.String at org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction$1.apply(JavaPairRDD.scala:1040) at scala.collection.Iterator$$anon$11.next(Iterator.scala:409) at scala.collection.Iterator$$anon$11.next(Iterator.scala:409) at scala.collection.Iterator$$anon$11.next(Iterator.scala:409) at org.apache.spark.sql.execution.datasources.FileFormatWriter$SingleDirectoryWriteTask.execute(FileFormatWriter.scala:244) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask$3.apply(FileFormatWriter.scala:190) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask$3.apply(FileFormatWriter.scala:188) at org.apache.spark.util.Utils$.tryWithSafeFinallyAndFailureCallbacks(Utils.scala:1341) at org.apache.spark.sql.execution.datasources.FileFormatWriter$.org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask(FileFormatWriter.scala:193) ... 8 more Ultimately my intention is to use Spark SQL to filter and join the data with other csvs, containing other table data, and write the entire results to parquet. I've only found scala related questions which haven't addressed my problem. Any help is much appreciated. csv: cob_date, database_id, name 20181115,56459865,name1 20181115,56652865,name6 20181115,56459845,name32 20181115,15645936,name3 A: .map((Function<String, Measure>) s -> { Looks like here should be .map((Function<Row, Measure>) s -> {