Polishing.

Move JsonParser creation to dedicated method. Original Pull Request: spring-projects#2999

Author: christophstrobl

src/main/java/org/springframework/data/redis/serializer/GenericJackson2JsonRedisSerializer.java

@@ -385,9 +385,8 @@ private JsonNode readTree(byte[] source) throws IOException {
 JsonDeserializer<? extends JsonNode> deserializer = JsonNodeDeserializer.getDeserializer(JsonNode.class);
 DeserializationConfig cfg = mapper.getDeserializationConfig();
 
-try (JsonParser parser = mapper.createParser(source)) {
+try (JsonParser parser = createParser(source, cfg)) {
 
-cfg.initialize(parser);
 JsonToken t = parser.currentToken();
 if (t == null) {
 t = parser.nextToken();
@@ -408,6 +407,13 @@ private JsonNode readTree(byte[] source) throws IOException {
 }
 }
 }
+
+private JsonParser createParser(byte[] source, DeserializationConfig cfg) throws IOException {
+
+JsonParser parser = mapper.createParser(source);
+cfg.initialize(parser);
+return parser;
+}
 }
 
 /**