[BAEL-12185] - Updated JACKSON ANNOTATIONS article

jackson/src/main/java/com/baeldung/jackson/serialization/jsonrootname/Author.java

@@ -13,7 +13,7 @@ import java.util.List;
  * @author Alex Theedom www.readlearncode.com
  * @version 1.0
  */
-@JsonRootName("writer")
+@JsonRootName(value = "writer", namespace = "book")
 public class Author extends Person {
 
     List<Item> items = new ArrayList<>();

jackson/src/test/java/com/baeldung/jackson/annotation/AliasBean.java

@@ -0,0 +1,31 @@
+package com.baeldung.jackson.annotation;
+
+import com.fasterxml.jackson.annotation.JsonAlias;
+
+public class AliasBean {
+    
+    @JsonAlias({ "fName", "f_name" })
+    private String firstName;
+    
+    private String lastName;
+    
+    public AliasBean() {
+    
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+}

jackson/src/test/java/com/baeldung/jackson/test/JacksonAnnotationUnitTest.java

@@ -14,6 +14,7 @@ import java.util.TimeZone;
 
 import org.junit.Test;
 
+import com.baeldung.jackson.annotation.AliasBean;
 import com.baeldung.jackson.annotation.BeanWithCreator;
 import com.baeldung.jackson.annotation.BeanWithCustomAnnotation;
 import com.baeldung.jackson.annotation.BeanWithFilter;
@@ -38,6 +39,7 @@ import com.baeldung.jackson.dtos.withEnum.DistanceEnumWithValue;
 import com.baeldung.jackson.exception.UserWithRoot;
 import com.baeldung.jackson.jsonview.Item;
 import com.baeldung.jackson.jsonview.Views;
+import com.baeldung.jackson.serialization.jsonrootname.Author;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.InjectableValues;
 import com.fasterxml.jackson.databind.MapperFeature;
@@ -46,6 +48,7 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.ser.FilterProvider;
 import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
 import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
 
 public class JacksonAnnotationUnitTest {
 
@@ -372,5 +375,43 @@ public class JacksonAnnotationUnitTest {
         assertThat(result, containsString("1"));
         assertThat(result, containsString("name"));
     }
+    
+    @Test
+    public void whenDeserializingUsingJsonAlias_thenCorrect() throws IOException {
+
+        // arrange
+        String json = "{\"fName\": \"Alex\", \"lastName\": \"Theedom\"}";
+
+        // act
+        AliasBean aliasBean = new ObjectMapper().readerFor(AliasBean.class).readValue(json);
+
+        // assert
+        assertThat(aliasBean.getFirstName(), is("Alex"));
+    }
+    
+    @Test
+    public void whenSerializingUsingXMLRootNameWithNameSpace_thenCorrect() throws JsonProcessingException {
+
+        // arrange
+        Author author = new Author("Alex", "Theedom");
+
+        // act
+        ObjectMapper mapper = new XmlMapper();
+        mapper = mapper.enable(SerializationFeature.WRAP_ROOT_VALUE).enable(SerializationFeature.INDENT_OUTPUT);
+        String result = mapper.writeValueAsString(author);
+
+        // assert
+        assertThat(result, containsString("<writer xmlns=\"book\">"));
+
+        /*
+            <writer xmlns="book">
+              <id xmlns="">3006b44a-cf62-4cfe-b3d8-30dc6c46ea96</id>
+              <firstName xmlns="">Alex</firstName>
+              <lastName xmlns="">Theedom</lastName>
+              <items xmlns=""/>
+            </writer>
+        */
+
+    }
 
 }

pom.xml

@@ -1630,7 +1630,7 @@
 		<javax.servlet.jsp-api.version>2.3.1</javax.servlet.jsp-api.version>
 		<jackson-mapper-asl.version>1.9.13</jackson-mapper-asl.version>
 		<jstl.version>1.2</jstl.version>
-		<jackson.version>2.9.7</jackson.version>
+		<jackson.version>2.9.8</jackson.version>
 		<commons-fileupload.version>1.3</commons-fileupload.version>
 		<junit-platform.version>1.2.0</junit-platform.version>
 		<junit-jupiter.version>5.2.0</junit-jupiter.version>