What is the importance of Jackson @JsonInclude annotation in Java?

The Jackson @JsonInclude annotation can be used to exclude properties or fields of a class under certain conditions, and It can be defined using the JsonInclude.Include enumeration. JsonInclude.Include enum Contains some constants, such as "ALWAYS", "NON_DEFAULT", "NON_EMPTY" and "NON_NULL", used to determine whether to exclude attributes (fields).

Syntax

public static enum JsonInclude.Include extends Enum<JSonInclude.Include>

Example

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import java.io.*;
public class JsonIncludeTest {
   public static void main(String args[]) throws IOException {
      ObjectMapper objectMapper = new ObjectMapper();
      Employee emp = new Employee();
      String jsonString = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(emp);
      System.out.println(jsonString);
   }
}
// Employee class
@JsonInclude(JsonInclude.Include.NON_EMPTY)
class Employee {
   public int empId = 115;
   public String empName = null;
   @Override
   public String toString() {
      return "Employee{" +
             "empId=" + empId +
             ", empName='" + empName + '\'' +
             '}';
   }
}

Output

{
   "empId" : 115
}

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