Feedback changes

Author: inv-jishnu

data-loader/core/src/main/java/com/scalar/db/dataloader/core/dataexport/ExportManager.java

@@ -120,7 +120,7 @@ public ExportReport startExport(
           | IOException
           | UnknownTransactionStatusException
           | CrudException e) {
-        logger.error("Error during export: {}", e.getMessage());
+        logger.error("Error during export: ", e);
       } finally {
         bufferedWriter.flush();
       }

data-loader/core/src/test/java/com/scalar/db/dataloader/core/dataexport/CsvExportManagerTest.java

@@ -49,7 +49,7 @@ void setup() {
   @Test
   void startExport_givenValidDataWithoutPartitionKey_shouldGenerateOutputFile()
       throws IOException, ScalarDbDaoException {
-    exportManager = new JsonLineExportManager(manager, dao, producerTaskFactory);
+    exportManager = new CsvExportManager(manager, dao, producerTaskFactory);
     TransactionManagerCrudOperable.Scanner scanner =
         Mockito.mock(TransactionManagerCrudOperable.Scanner.class);
     String filePath = Paths.get("").toAbsolutePath() + "/output.csv";