I'm trying to read the data from a .json file and store it in a% of objects%, however an error is occurring that I do not know what it means.
Class Sale - To store the data that will be brought from the file
public class Sale {
private int n_payments;
private String sale_id;
private String timestamp;
private String payment_method;
private String id_product;
public int getN_payments() {
return n_payments;
}
public void setN_payments(int n_payments) {
this.n_payments = n_payments;
}
public String getSale_id() {
return sale_id;
}
public void setSale_id(String sale_id) {
this.sale_id = sale_id;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getPayment_method() {
return payment_method;
}
public void setPayment_method(String payment_method) {
this.payment_method = payment_method;
}
public String getId_product() {
return id_product;
}
public void setId_product(String id_product) {
this.id_product = id_product;
}
}
JSONRead class- To read the data
public class JSONRead {
public static void main(String[] args) {
Gson gson = new Gson();
java.lang.reflect.Type type = new TypeToken<List<Sale>>() {}.getType();
try{
Reader br = new FileReader(new File(ClassLoader.getSystemResource("C:\Users\casa\Desktop\sales.jsonl").getFile()));
List<Sale> sales = gson.fromJson(br, type);
System.out.println(sales);
}catch(IOException e){
e.printStackTrace();
}
}
}
Error that is shown
Exception in thread "main" java.lang.NullPointerException
at JSONRead.main(JSONRead.java:18)
C:\Users\casa\AppData\Local\NetBeans\Cache.2\executor-snippets\run.xml:53: Java returned: 1
FALHA NA CONSTRUÇÃO (tempo total: 4 segundos)
Sales.json file
{"n_payments":1,"sale_id":"574936432081248","timestamp":"2017-03-03 11:51:42","payment_method":"debit","product_id":"2700455360785340"}
{"n_payments":1,"sale_id":"8390335018619568","timestamp":"2017-11-19 22:00:19","payment_method":"debit","product_id":"0157148090593854"}
{"n_payments":1,"sale_id":"6734916500594364","timestamp":"2017-03-11 0:26:28","payment_method":"credit","product_id":"4995839903495816"}