diff --git a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/QueryMapper.java b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/QueryMapper.java
index 6d58b216f..8aa2a30e6 100644
--- a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/QueryMapper.java
+++ b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/QueryMapper.java
@@ -132,10 +132,8 @@ public class QueryMapper {
 			// TODO: remove one once QueryMapper can work with Query instances directly
 			if (Query.isRestrictedTypeKey(key)) {
 
-				@SuppressWarnings("unchecked")
 				Set<Class<?>> restrictedTypes = BsonUtils.get(query, key);
 				this.converter.getTypeMapper().writeTypeRestrictions(result, restrictedTypes);
-
 				continue;
 			}
 
@@ -282,7 +280,7 @@ public class QueryMapper {
 		if (keyword.isOrOrNor() || (keyword.hasIterableValue() && !keyword.isGeometry())) {
 
 			Iterable<?> conditions = keyword.getValue();
-			List<Object> newConditions = new ArrayList<Object>();
+			List<Object> newConditions = new ArrayList<>();
 
 			for (Object condition : conditions) {
 				newConditions.add(isDocument(condition) ? getMappedObject((Document) condition, entity)
@@ -293,11 +291,12 @@ public class QueryMapper {
 		}
 
 		if (keyword.isSample()) {
-			return exampleMapper.getMappedExample(keyword.<Example<?>> getValue(), entity);
+			return exampleMapper.getMappedExample(keyword.getValue(), entity);
 		}
 
 		if (keyword.isJsonSchema()) {
-			return schemaMapper.mapSchema(new Document(keyword.getKey(), keyword.getValue()), entity != null ? entity.getType() : Object.class);
+			return schemaMapper.mapSchema(new Document(keyword.getKey(), keyword.getValue()),
+					entity != null ? entity.getType() : Object.class);
 		}
 
 		return new Document(keyword.getKey(), convertSimpleOrDocument(keyword.getValue(), entity));
@@ -318,7 +317,7 @@ public class QueryMapper {
 		Object convertedValue = needsAssociationConversion ? convertAssociation(value, property)
 				: getMappedValue(property.with(keyword.getKey()), value);
 
-		if(keyword.isSample() && convertedValue instanceof Document) {
+		if (keyword.isSample() && convertedValue instanceof Document) {
 			return (Document) convertedValue;
 		}
 
@@ -337,8 +336,8 @@ public class QueryMapper {
 	@SuppressWarnings("unchecked")
 	protected Object getMappedValue(Field documentField, Object value) {
 
-		if(documentField.getProperty() != null && documentField.getProperty().hasExplicitWriteTarget()) {
-			if(conversionService.canConvert(value.getClass(), documentField.getProperty().getFieldType())) {
+		if (documentField.getProperty() != null && documentField.getProperty().hasExplicitWriteTarget()) {
+			if (conversionService.canConvert(value.getClass(), documentField.getProperty().getFieldType())) {
 				value = conversionService.convert(value, documentField.getProperty().getFieldType());
 			}
 		}
@@ -351,7 +350,7 @@ public class QueryMapper {
 
 				if (valueDbo.containsField("$in") || valueDbo.containsField("$nin")) {
 					String inKey = valueDbo.containsField("$in") ? "$in" : "$nin";
-					List<Object> ids = new ArrayList<Object>();
+					List<Object> ids = new ArrayList<>();
 					for (Object id : (Iterable<?>) valueDbo.get(inKey)) {
 						ids.add(convertId(id, getIdTypeForField(documentField)));
 					}
@@ -370,7 +369,7 @@ public class QueryMapper {
 
 				if (valueDbo.containsKey("$in") || valueDbo.containsKey("$nin")) {
 					String inKey = valueDbo.containsKey("$in") ? "$in" : "$nin";
-					List<Object> ids = new ArrayList<Object>();
+					List<Object> ids = new ArrayList<>();
 					for (Object id : (Iterable<?>) valueDbo.get(inKey)) {
 						ids.add(convertId(id, getIdTypeForField(documentField)));
 					}
@@ -451,8 +450,8 @@ public class QueryMapper {
 	@SuppressWarnings("unchecked")
 	protected Object convertSimpleOrDocument(Object source, @Nullable MongoPersistentEntity<?> entity) {
 
-		if(source instanceof Example) {
-			return exampleMapper.getMappedExample((Example)source, entity);
+		if (source instanceof Example) {
+			return exampleMapper.getMappedExample((Example) source, entity);
 		}
 
 		if (source instanceof List) {