diff --git a/jackson/src/test/java/com/baeldung/jackson/deserialization/JacksonMapDeserializeTest.java b/jackson/src/test/java/com/baeldung/jackson/deserialization/JacksonMapDeserializeTest.java
index 04eb89306b..5021abaac1 100644
--- a/jackson/src/test/java/com/baeldung/jackson/deserialization/JacksonMapDeserializeTest.java
+++ b/jackson/src/test/java/com/baeldung/jackson/deserialization/JacksonMapDeserializeTest.java
@@ -18,13 +18,13 @@ public class JacksonMapDeserializeTest {
 
 	private Map<MyPair, String> map;
 	private Map<MyPair, MyPair> cmap;
+	final ObjectMapper mapper = new ObjectMapper();
 
 	@Test
 	public void whenSimpleMapDeserialize_thenCorrect()
 			throws JsonParseException, JsonMappingException, IOException {
 
 		final String jsonInput = "{\"key\": \"value\"}";
-		final ObjectMapper mapper = new ObjectMapper();
 		TypeReference<HashMap<String, String>> typeRef = new TypeReference<HashMap<String, String>>() {
 		};
 
@@ -38,7 +38,6 @@ public class JacksonMapDeserializeTest {
 			throws JsonParseException, JsonMappingException, IOException {
 
 		final String jsonInput = "{\"Abbott and Costello\":\"Comedy\"}";
-		final ObjectMapper mapper = new ObjectMapper();
 
 		TypeReference<HashMap<MyPair, String>> typeRef = new TypeReference<HashMap<MyPair, String>>() {
 		};
@@ -59,7 +58,6 @@ public class JacksonMapDeserializeTest {
 			throws JsonParseException, JsonMappingException, IOException {
 
 		final String jsonInput = "{\"Abbott and Costello\" : \"Comedy and 1940s\"}";
-		final ObjectMapper mapper = new ObjectMapper();
 		TypeReference<HashMap<MyPair, MyPair>> typeRef = new TypeReference<HashMap<MyPair, MyPair>>() {
 		};
 
diff --git a/jackson/src/test/java/com/baeldung/jackson/serialization/JacksonMapSerializeTest.java b/jackson/src/test/java/com/baeldung/jackson/serialization/JacksonMapSerializeTest.java
index 841b12ca03..a5ee76f3b8 100644
--- a/jackson/src/test/java/com/baeldung/jackson/serialization/JacksonMapSerializeTest.java
+++ b/jackson/src/test/java/com/baeldung/jackson/serialization/JacksonMapSerializeTest.java
@@ -26,6 +26,8 @@ public class JacksonMapSerializeTest {
 	@JsonSerialize(keyUsing = MyPairSerializer.class)
 	private MyPair mapValue;
 
+	final ObjectMapper mapper = new ObjectMapper();
+
 	@Test
 	public void whenSimpleMapSerialize_thenCorrect()
 			throws JsonProcessingException {
@@ -33,7 +35,6 @@ public class JacksonMapSerializeTest {
 		Map<String, String> map = new HashMap<>();
 		map.put("key", "value");
 
-		final ObjectMapper mapper = new ObjectMapper();
 		final String jsonResult = mapper.writeValueAsString(map);
 
 		Assert.assertEquals("{\"key\":\"value\"}", jsonResult);
@@ -47,7 +48,6 @@ public class JacksonMapSerializeTest {
 		MyPair key = new MyPair("Abbott", "Costello");
 		map.put(key, "Comedy");
 
-		final ObjectMapper mapper = new ObjectMapper();
 		final String jsonResult = mapper.writeValueAsString(map);
 
 		Assert.assertEquals("{\"Abbott and Costello\":\"Comedy\"}", jsonResult);
@@ -62,7 +62,6 @@ public class JacksonMapSerializeTest {
 		mapValue = new MyPair("Comedy", "1940's");
 		cmap.put(mapKey, mapValue);
 
-		final ObjectMapper mapper = new ObjectMapper();
 		final String jsonResult = mapper.writeValueAsString(cmap);
 
 		Assert.assertEquals("{\"Abbott and Costello\":\"Comedy and 1940's\"}",