How to generate json by using lombok+gson using builder() method? - gson

Question

I have a json like this, how can I generate it by using lombok expression + gson library? It has a mixture of array and list. Is there any readymade tool available?
{
"transactions": [
{
"transactionIds": 123456,
"test": 3000,
"amount": {
"currency": "USD",
"value": 10
}
}
]
}

Answer 1

Define the values like you always do and rather generating the getters / setters you would be adding the #Data attribute, Complete code below along with the dependencies
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.ArrayList;
import java.util.List;
import lombok.Data;
public class Stack32 {
public static #Data class Amount {
private String currency;
private int value;
}
public static #Data class Child {
private int transactionIds;
private int test;
private Amount amount;
}
public static #Data class Parent {
private List<Child> transactions = new ArrayList<Child>();
}
public static void main(String[] args) throws JsonProcessingException {
Amount a1 = new Amount();
a1.setCurrency("USD");
a1.setValue(10);
Child a2 = new Child();
a2.setTransactionIds(123456);
a2.setTest(3000);
a2.setAmount(a1);
Parent a3 = new Parent();
a3.getTransactions().add(a2);
ObjectMapper mapper = new ObjectMapper();
String payload = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(a3);
System.out.println(payload);
}
}
Depdendencies :
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
</dependencies>