GH-1764: JsonDeserializer: Remove Java9 Construct

Resolves #1761 (reply in thread)

Author: garyrussell

Diff for: spring-kafka/src/main/java/org/springframework/kafka/support/serializer/JsonDeserializer.java

@@ -483,8 +483,8 @@ public void addTrustedPackages(String... packages) {
 
 	private void addMappingsToTrusted(Map<String, Class<?>> mappings) {
 		mappings.values().forEach(clazz -> {
-			doAddTrustedPackages(clazz.getPackageName());
-			doAddTrustedPackages(clazz.getPackageName() + ".*");
+			doAddTrustedPackages(clazz.getPackage().getName());
+			doAddTrustedPackages(clazz.getPackage().getName() + ".*");
 		});
 	}