Jackson - Serialization Annotations
- Jackson - @JsonAnyGetter
- Jackson - @JsonGetter
- Jackson - @JsonPropertyOrder
- Jackson - @JsonRawValue
- Jackson - @JsonValue
- Jackson - @JsonRootName
- Jackson - @JsonSerialize
Jackson - Deserialization Annotations
- Jackson - @JsonCreator
- Jackson - @JacksonInject
- Jackson - @JsonAnySetter
- Jackson - @JsonSetter
- Jackson - @JsonDeserialize
- Jackson - @JsonEnumDefaultValue
Jackson - Property Inclusion Annotations
- Jackson - @JsonIgnoreProperties
- Jackson - @JsonIgnore
- Jackson - @JsonIgnoreType
- Jackson - @JsonInclude
- Jackson - @JsonAutoDetect
Jackson - Type Handling Annotations
Jackson - General Annotations
- Jackson - @JsonProperty
- Jackson - @JsonFormat
- Jackson - @JsonUnwrapped
- Jackson - @JsonView
- Jackson - @JsonManagedReference
- Jackson - @JsonBackReference
- Jackson - @JsonIdentityInfo
- Jackson - @JsonFilter
Jackson - Miscellaneous
Jackson - Resources
Jackson Annotations - @JsonInclude
Overview
@JsonInclude annotation is used to exclude properties having null/empty or default values.
Example - Serialization without using @JsonInclude
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonTester {
public static void main(String args[]){
ObjectMapper mapper = new ObjectMapper();
try {
Student student = new Student(1,null);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
class Student {
public int id;
public String name;
Student(int id,String name){
this.id = id;
this.name = name;
}
}
Output
Run the JacksonTester and verify the output −
{
"id" : 1,
"name" : null
}
Example - Serialization with @JsonInclude
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonTester {
public static void main(String args[]){
ObjectMapper mapper = new ObjectMapper();
try {
Student student = new Student(1,null);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
@JsonInclude(JsonInclude.Include.NON_NULL)
class Student {
public int id;
public String name;
Student(int id,String name){
this.id = id;
this.name = name;
}
}
Output
Run the JacksonTester and verify the output −
{
"id" : 1
}
Here we can see, without using @JsonInclude, Jackson is serializing all values including null as well. Using @JsonInclude we can define the values which are to be ignored during serialization.
Advertisements