diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectMarshaller.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectMarshaller.java
index 501afe138..c4c982d62 100644
--- a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectMarshaller.java
+++ b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectMarshaller.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 the original author or authors.
+ * Copyright 2018-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,14 +28,14 @@ import com.google.gson.Gson;
  */
 public class GsonJsonObjectMarshaller<T> implements JsonObjectMarshaller<T> {
 
-	private Gson gson = new Gson();
+	private Gson gson;
 
 	public GsonJsonObjectMarshaller() {
-		this.gson=new Gson();
+		this(new Gson());
 	}
 	
 	public GsonJsonObjectMarshaller(Gson gson) {
-		this.gson=gson;
+		this.gson = gson;
 	}
 	
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectReader.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectReader.java
index 128121e16..da493a1a1 100644
--- a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectReader.java
+++ b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/GsonJsonObjectReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2019 the original author or authors.
+ * Copyright 2018-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -55,8 +55,7 @@ public class GsonJsonObjectReader<T> implements JsonObjectReader<T> {
 	 * @param itemType the target item type
 	 */
 	public GsonJsonObjectReader(Class<? extends T> itemType) {
-		this.mapper = new Gson();
-		this.itemType = itemType;
+		this(new Gson(), itemType);
 	}
 
 	public GsonJsonObjectReader(Gson mapper, Class<? extends T> itemType) {
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectMarshaller.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectMarshaller.java
index 535bd4e7f..dab06b215 100644
--- a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectMarshaller.java
+++ b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectMarshaller.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 the original author or authors.
+ * Copyright 2018-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,11 +34,11 @@ public class JacksonJsonObjectMarshaller<T> implements JsonObjectMarshaller<T> {
 	private ObjectMapper objectMapper;
 
 	public JacksonJsonObjectMarshaller() {
-		this.objectMapper = new ObjectMapper();
+		this(new ObjectMapper());
 	}
 
 	public JacksonJsonObjectMarshaller(ObjectMapper objectMapper) {
-		this.objectMapper=objectMapper;
+		this.objectMapper = objectMapper;
 	}
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectReader.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectReader.java
index bffbf5da2..141446f6c 100644
--- a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectReader.java
+++ b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/json/JacksonJsonObjectReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2019 the original author or authors.
+ * Copyright 2018-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,13 +52,12 @@ public class JacksonJsonObjectReader<T> implements JsonObjectReader<T> {
 	 * @param itemType the target item type
 	 */
 	public JacksonJsonObjectReader(Class<? extends T> itemType) {
-		this.mapper=new ObjectMapper();
-		this.itemType = itemType;
+		this(new ObjectMapper(), itemType);
 	}
 
 	public JacksonJsonObjectReader(ObjectMapper mapper, Class<? extends T> itemType) {
-		this.mapper= mapper;
-		this.itemType=itemType;
+		this.mapper = mapper;
+		this.itemType = itemType;
 	}
 
 	/**