Fix JSON category field name.

Author: mfl28

src/main/java/boundingboxeditor/model/io/JSONLoadStrategy.java

@@ -22,7 +22,8 @@
 import java.util.stream.Collectors;
 
 public class JSONLoadStrategy implements ImageAnnotationLoadStrategy {
-    private static final String OBJECT_CATEGORY_SERIALIZED_NAME = "name";
+    private static final String OBJECT_CATEGORY_NAME_SERIALIZED_NAME = "name";
+    private static final String OBJECT_CATEGORY_SERIALIZED_NAME = "category";
     private static final String OBJECT_COLOR_SERIALIZED_NAME = "color";
     private static final String IMAGE_META_DATA_SERIALIZED_NAME = "image";
     private static final String BOUNDING_SHAPE_DATA_SERIALIZED_NAME = "objects";
@@ -212,15 +213,15 @@ public ObjectCategory deserialize(JsonElement json, java.lang.reflect.Type type,
                                           JsonDeserializationContext context) throws JsonParseException {
             final JsonObject jsonObject = json.getAsJsonObject();
 
-            if(!jsonObject.has(OBJECT_CATEGORY_SERIALIZED_NAME)) {
+            if(!jsonObject.has(OBJECT_CATEGORY_NAME_SERIALIZED_NAME)) {
                 unParsedFileErrorMessages
                         .add(new IOResult.ErrorInfoEntry(annotationFileName,
                                                          MISSING_CATEGORY_NAME_ERROR_MESSAGE + currentFilename.get() +
                                                                  "."));
                 return null;
             }
 
-            final String categoryName = jsonObject.get(OBJECT_CATEGORY_SERIALIZED_NAME).getAsString();
+            final String categoryName = jsonObject.get(OBJECT_CATEGORY_NAME_SERIALIZED_NAME).getAsString();
 
             Color categoryColor;
 
@@ -431,7 +432,7 @@ public BoundingBoxData deserialize(JsonElement json, java.lang.reflect.Type type
                                            JsonDeserializationContext context) throws JsonParseException {
             final JsonObject jsonObject = json.getAsJsonObject();
 
-            if(!jsonObject.has(OBJECT_CATEGORY_SERIALIZED_NAME)) {
+            if(!jsonObject.has("category")) {
                 unParsedFileErrorMessages.add(new IOResult.ErrorInfoEntry(annotationFileName,
                                                                           BOX_MISSING_CATEGORY_ERROR_MESSAGE +
                                                                                   currentFileName.get() + "."));