Java — Convert Object to Map example

In Java, you can use the Jackson library to convert a Java object into a Map easily.

1. Get Jackson

pom.xml

<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
	<artifactId>jackson-databind</artifactId>
	<version>2.6.3</version>
</dependency>

2. Convert Object to Map

2.1 A Jackson 2 example to convert a Student object into a java.util.Map

Student.java

package com.nayan.examples;
import java.util.List;
public class Student {
    private String name;
    private int age;
    private List<String> skills;
    // getters setters
}

ObjectToMapExample.java

package com.nayan.examples;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.Arrays;
import java.util.Map;
public class ObjectToMapExample {
    public static void main(String[] args) {
        ObjectMapper oMapper = new ObjectMapper();
        Student obj = new Student();
        obj.setName("nayan");
        obj.setAge(34);
        obj.setSkills(Arrays.asList("java","angular"));
        // object -> Map
        Map<String, Object> map = oMapper.convertValue(obj, Map.class);
        System.out.println(map);
    }
}

Output

{name=nayan, age=34, skills=[java, angular]}