Fix additional media type issue

Author: My Name

src/main/java/com/amazonaws/sagemaker/controller/ServingController.java

@@ -157,7 +157,7 @@ public ResponseEntity<String> transformRequestCsv(@RequestBody final byte[] csvR
      * @param accept, accept parameter from request
      * @return ResponseEntity with body as the expected payload JSON & proper statuscode based on the input
      */
-    @RequestMapping(path = "/invocations", method = POST, consumes = AdditionalMediaType.APPLICATION_JSONLINES_VALUE)
+    @RequestMapping(path = "/invocations", method = POST, consumes = AdditionalMediaType.APPLICATION_JSONLINES_VALUE_MULTIPLE)
     public ResponseEntity<String> transformRequestJsonLines(@RequestBody final byte[] jsonLines,
                                                             @RequestHeader(value = HttpHeaders.ACCEPT, required = false) final String accept) {
         if (jsonLines == null) {

src/main/java/com/amazonaws/sagemaker/dto/SageMakerDataListObject.java

@@ -23,8 +23,8 @@
 import java.util.List;
 
 /**
- * Request object POJO to which input request in JSONLINES format will be mapped to by Spring (using Jackson). For sample
- * input, please see test/resources/com/amazonaws/sagemaker/dto
+ * Request object POJO to which data field of input request in JSONLINES format will be mapped to by Spring (using Jackson).
+ * For sample input, please see test/resources/com/amazonaws/sagemaker/dto
  */
 public class SageMakerDataListObject {
 

src/main/java/com/amazonaws/sagemaker/type/AdditionalMediaType.java

@@ -23,6 +23,7 @@ public final class AdditionalMediaType {
 
     public static final String TEXT_CSV_VALUE = "text/csv";
     public static final String APPLICATION_JSONLINES_VALUE = "application/jsonlines";
+    public static final String APPLICATION_JSONLINES_VALUE_MULTIPLE ="application/jsonlines;data=multiline";
     public static final String APPLICATION_JSONLINES_TEXT_VALUE = "application/jsonlines;data=text";
 
 }