jason.deserialize is returning null

Hi All,
i am trying to parsing the below jason into my object.but while using the deserialize method its comming as Null.
not sure what i am missinh here.

Jason response :
{"invoiceList":[{"totalPrice":5.5,"statementDate":"2011-10-04T16:58:54.858Z","lineItems":[{"UnitPrice":1.0,"Quantity":5.0,"ProductName":"Pencil"},{"UnitPrice":0.5,"Quantity":1.0,"ProductName":"Eraser"}],"invoiceNumber":1},{"totalPrice":11.5,"statementDate":"2011-10-04T16:58:54.858Z","lineItems":[{"UnitPrice":6.0,"Quantity":1.0,"ProductName":"Notebook"},{"UnitPrice":2.5,"Quantity":1.0,"ProductName":"Ruler"},{"UnitPrice":1.5,"Quantity":2.0,"ProductName":"Pen"}],"invoiceNumber":2}]}

Wrapper class for data structure :
public class WrapperListinvoice {
public List<invoicelist> invoicepp;

public class invoicelist{
public double totalprice;
public DateTime Statementdate;
public list<Lineitems> sline;
public integer invoicenum;
}
public class Lineitems{
public double unitprice;
public double quantity;
public string productname;
}
}

calling class :
HttpRequest res= new HttpRequest();
res.setEndpoint('https://docsample.herokuapp.com/jsonSample');
res.setMethod('GET');
res.setHeader('Content-Type', 'application/json');
res.setHeader('Accept','application/json');
Http hes= new Http();
httpresponse repp=hes.send(res);
string s=repp.getBody();
integer status =repp.getStatusCode();

//list<responseBean> assp= new list<responseBean>();
WrapperListinvoice responseBean=(WrapperListinvoice) JSON.deserialize(s,WrapperListinvoice.class);
system.debug(responseBean);

Can somebody please help me to understand what i am missing here.

Thanks,
Bhaskar

January 18, 2019
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Raj Vakati
The JSON is causing an issue JSON.deserializeUntyped .. To apex to JSON the following json must to be updated
"UnitPrice":1.0 --> should be change like "UnitPrice":"1.0"

Use the deserializeUntyped as shown below

Map<String, Object> m = (Map<String, Object>)JSON.deserializeUntyped(s);

HttpRequest res= new HttpRequest(); res.setEndpoint('https://docsample.herokuapp.com/jsonSample'); res.setMethod('GET'); res.setHeader('Content-Type', 'application/json'); res.setHeader('Accept','application/json'); Http hes= new Http(); httpresponse repp=hes.send(res); string s=repp.getBody(); integer status =repp.getStatusCode(); System.debug('s'+s); System.debug('status'+status); if(status==200){ Map<String, Object> m = (Map<String, Object>)JSON.deserializeUntyped(s); Do the for loop and set the values into the wrapper class //list<responseBean> assp= new list<responseBean>(); //WrapperListinvoice responseBean=(WrapperListinvoice) JSON.deserialize(s,WrapperListinvoice.class); system.debug(m); }

Use the below wrapper class

public class WrapperListinvoice { public cls_invoiceList[] invoiceList{get;set;} class cls_invoiceList { public Double totalPrice{get; set { totalPrice = 0 ; } }//5.5 public String statementDate{get;set { statementDate = ''; }} //2011-10-04T16:58:54.858Z public cls_lineItems[] lineItems{get;set;} public Integer invoiceNumber{get; set { invoiceNumber = 0 ; }} //1 } class cls_lineItems { public Integer UnitPrice{get; set { UnitPrice = 0 ; }} //1 public Integer Quantity{get; set { Quantity = 0 ; }} //5 public String ProductName{get; set { ProductName = '' ; }} //Pencil } }