In this example we will show you how to convert java object to JSON using Jackson library.

Firs of all we need to add following dependency into the maven pom.xml

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.8.6</version>
</dependency>

To convert the java object into JSON we need to do following:

ObjectMapper objectMapper = new ObjectMapper();
String json = objectMapper.writeValueAsString(object);

And the full example:

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonModelToJsonExample {

    private static class User {

        private String name;

        private String emailAddress;

        public User(String name, String emailAddress) {
            this.name = name;
            this.emailAddress = emailAddress;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getEmailAddress() {
            return emailAddress;
        }

        public void setEmailAddress(String emailAddress) {
            this.emailAddress = emailAddress;
        }
    }

    public static void main(String[] args) throws JsonProcessingException {
        User user = new User("testName", "testEmailAddress");
        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(user);
        System.out.println(json);
    }
}

Output should be following:

{"name":"testName","emailAddress":"testEmailAddress"}