Resolve new Sonar issues

Author: garyrussell

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

@@ -335,6 +335,10 @@ public void configure(Map<String, ?> configs, boolean isKey) {
 		if (configs.containsKey(REMOVE_TYPE_INFO_HEADERS)) {
 			this.removeTypeHeaders = Boolean.parseBoolean(configs.get(REMOVE_TYPE_INFO_HEADERS).toString());
 		}
+		setUpTypeMethod(configs, isKey);
+	}
+
+	private void setUpTypeMethod(Map<String, ?> configs, boolean isKey) {
 		if (isKey && configs.containsKey(KEY_TYPE_METHOD)) {
 			setUpTypeFuntion((String) configs.get(KEY_TYPE_METHOD));
 		}

spring-kafka/src/main/java/org/springframework/kafka/support/serializer/ParseStringDeserializer.java

@@ -88,10 +88,8 @@ public void configure(Map<String, ?> configs, boolean isKey) {
 			String parserMethod = (String) configs.get(isKey ? KEY_PARSER : VALUE_PARSER);
 			Assert.state(parserMethod != null,
 					"A parser must be provided either via a constructor or consumer properties");
-			BiFunction<String, Headers, T> parser;
-			parser = SerializationUtils.propertyToMethodInvokingFunction(parserMethod, String.class,
+			this.parser = SerializationUtils.propertyToMethodInvokingFunction(parserMethod, String.class,
 					getClass().getClassLoader());
-			this.parser = parser;
 		}
 	}