You can define Custom Jackson Annotation using @JacksonAnnotationsInside. @JacksonAnnotationsInside is a meta-annotation used to create a "combo-annotations" by having a container annotation, which needs to be annotated with this annotation as well as all annotations it 'contains'.
Example
Find the below working application.
AppJSON.java
package com.sample.app.jackson;
import static com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility.NONE;
import static com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility.PUBLIC_ONLY;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import com.fasterxml.jackson.annotation.JacksonAnnotationsInside;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonInclude;
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
@JsonAutoDetect(getterVisibility = PUBLIC_ONLY, setterVisibility = PUBLIC_ONLY, fieldVisibility = NONE)
@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonIgnoreProperties(ignoreUnknown = true)
public @interface AppJSON {
}
Employee.java
package com.sample.app.model;
import com.sample.app.jackson.AppJSON;
@AppJSON
public class Employee {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
App.java
package com.sample.app.jackson;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.sample.app.model.Employee;
public class App {
public static void main(String args[]) throws JsonProcessingException {
Employee emp = new Employee();
emp.setId(1);
emp.setName("Krishna");
String result = new ObjectMapper().writeValueAsString(emp);
System.out.println(result);
}
}
Output
{"id":1,"name":"Krishna"}
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