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Ljava.lang.Object; cannot be cast to model

in this case, i want to show Json to an response page in java hibernate, query method from DAO like this:
public List<TransactionQR> getAllTransaction() throws HibernateException {
return this.session.createQuery("FROM TransactionQR tr, Batch b, Terminal t, User_Smartphone us, Merchant mc WHERE tr.batch = b.id AND b.user_smartphone = us.id AND b.terminal = t.id AND t.merchant = mc.id AND state = '1' ").list();
}
then in servlet class i try to convert the list into json using Json object and json array then write in response like this:
int start = 0;
String jsonResult = null;
JSONObject jo=new JSONObject();
HttpServletRequest request = context.getRequest();
HttpServletResponse response = context.getResponse();
HttpSession session = context.getSession();
DB db = getDB(context);
//JSONObject jo = new JSONObject();
QRTransactionDao QR = new QRTransactionDao(db);
//Gson objGson = new GsonBuilder().setPrettyPrinting().create();
//String json = objGson.toJson(QR.getAllTransaction());
//System.out.println(json);
List<TransactionQR> str = QR.getAllTransaction();
JSONArray array = new JSONArray();
for(TransactionQR tr : str){
JSONObject str3 = new JSONObject();
str3.put("amount", tr.getAmount());
context.put("jsoncontent", jsonResult);
array.add(str3);
}
jo.put("status", "ok");
jo.put("dataqr", array);
jsonResult=jo.toString();
response.setContentType("application/json");
response.getWriter().print(jsonResult);
but i got the error on syntax in this line loop:
for(TransactionQR tr : str){
the error like this:
[Ljava.lang.Object; cannot be cast to Transaction
here the model Transaction:
package id.co.keriss.consolidate.ee;
import java.io.Serializable;
import java.util.Date;
public class TransactionQR implements Serializable{
private Long id;
private String codeqr;
private Date approvaltime;
private String merchant;
private String code_merchant;
private Long amount;
private Long saldoawal;
private Integer tracenumber;
private String state;
private Date createdate;
private Batch batch;
public TransactionQR() {
}
public TransactionQR(Long id, String codeqr, Date approvaltime, String merchant, String code_merchant, Long amount,
Long saldoawal, Integer tracenumber, String state, Date createdate, Batch batch) {
super();
this.id = id;
this.codeqr = codeqr;
this.approvaltime = approvaltime;
this.merchant = merchant;
this.code_merchant = code_merchant;
this.amount = amount;
this.saldoawal = saldoawal;
this.tracenumber = tracenumber;
this.state = state;
this.createdate = createdate;
this.batch = batch;
}
public Long getId() {
return id;
}
public Date getApprovalTime() {
return approvaltime;
}
public Batch getBatch() {
return batch;
}
public void setBatch(Batch batch) {
this.batch = batch;
}
public void setApprovalTime(Date approvalTime) {
this.approvaltime = approvalTime;
}
public void setId(Long id) {
this.id = id;
}
public Date getApprovaltime() {
return approvaltime;
}
public void setApprovaltime(Date approvaltime) {
this.approvaltime = approvaltime;
}
public String getCodeqr() {
return codeqr;
}
public void setCodeqr(String codeqr) {
this.codeqr = codeqr;
}
public String getMerchant() {
return merchant;
}
public void setMerchant(String merchant) {
this.merchant = merchant;
}
public String getCode_merchant() {
return code_merchant;
}
public void setCode_merchant(String code_merchant) {
this.code_merchant = code_merchant;
}
public Long getAmount() {
return amount;
}
public void setAmount(Long amount) {
this.amount = amount;
}
public Long getSaldoawal() {
return saldoawal;
}
public void setSaldoawal(Long saldoawal) {
this.saldoawal = saldoawal;
}
public Integer getTracenumber() {
return tracenumber;
}
public void setTracenumber(Integer tracenumber) {
this.tracenumber = tracenumber;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public Date getCreatedate() {
return createdate;
}
public void setCreatedate(Date createdate) {
this.createdate = createdate;
}
}
i have try to handle the list with Gson:
Gson objGson = new GsonBuilder().setPrettyPrinting().create();
String json = objGson.toJson(QR.getAllTransaction());
System.out.println(json);
in that way, it's work to show but it's not from POJO right i want work with pojo to parse the data to json ?
why i get the error can't cast to model ? any clue ?

Try adding Select tr to your query in getAllTransaction()

Wich is the relation between QRTransactionDao and TransactionQR ?

JAVA linking ID to name from other table

I got a tableview with a tablecolumn ("ID").
How can i link the ID to show the value?
For example: ID 90 has to be "Shop" and ID 91 has to be "Wallmart"..
I'm using 2 tables:
Person(id, personName, personShopID)
Items(id, shopName)
PersonShopID links to ITEMS id and i have to show the shopName instead of the ID..
Note: I'm using JavaFX and i'm getting data from mysql database and i'm using tcShopName.setCellValueFactory(new PropertyValueFactory<>("personShopID"));
kind regards !
package databag;
import java.sql.Timestamp;
import java.sql.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import vivesgoal.controller.CustomDate;
/**
*
* #author Lowie Menu
*/
public class PersoonBag {
private int id;
private String naam;
private String voornaam;
private Date geboortedatum;
private String opmerking;
private boolean isTrainer;
private int ploeg_id;
public PersoonBag(int id, String naam, String voornaam, Date geboortedatum, String opmerking,boolean isTrainer, int ploeg_id){
this.id=id;
this.naam=naam;
this.voornaam=voornaam;
this.geboortedatum=geboortedatum;
this.opmerking=opmerking;
this.isTrainer=isTrainer;
this.ploeg_id=ploeg_id;
}
public PersoonBag()
{
}
public int getId() {
return id;
}
public String getNaam() {
return naam;
}
public String getVoornaam() {
return voornaam;
}
public Date getGeboortedatum() {
return geboortedatum;
}
public String getGeboortedatumAlter(){
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
String datum = df.format(geboortedatum);
return datum;
}
public CustomDate getMyDate(){
return new CustomDate(geboortedatum.getTime());
}
public java.util.Date getGeboortedatumUtil(){
return geboortedatum;
}
public String getOpmerking() {
return opmerking;
}
public boolean isIsTrainer() {
return isTrainer;
}
public int getPloeg_id() {
return ploeg_id;
}
public void setId(int id) {
this.id = id;
}
public void setNaam(String naam) {
this.naam = naam;
}
public void setVoornaam(String voornaam) {
this.voornaam = voornaam;
}
public void setGeboortedatum(Date geboortedatum) {
this.geboortedatum =geboortedatum;
}
public void setOpmerking(String opmerking) {
this.opmerking = opmerking;
}
public void setIsTrainer(boolean isTrainer) {
this.isTrainer = isTrainer;
}
public void setPloeg_id(int ploeg_id) {
this.ploeg_id = ploeg_id;
}
}
and class Team (dutch ploeg)
package databag;
/**
*
* #author Lowie Menu
*/
public class PloegBag {
private int id;
private String naam;
private String niveau;
private int trainer_id;
public PloegBag(int id, String naam, String niveau, int trainer_id){
this.id = id;
this.naam = naam;
this.niveau = niveau;
this.trainer_id = trainer_id;
}
public PloegBag(){
}
public void setId(int id) {
this.id = id;
}
public void setNaam(String naam) {
this.naam = naam;
}
public void setNiveau(String niveau) {
this.niveau = niveau;
}
public void setTrainer_id(int trainer_id){
this.trainer_id=trainer_id;
}
public int getId() {
return id;
}
public String getNaam() {
return naam;
}
public String getNiveau() {
return niveau;
}
public int getTrainer_id(){
return trainer_id;
}
}
Note: i'm trying to link ploeg_id from PersoonBag to the name of PloegBag(ploegnaam).
This sql code gets me the name of the club matching the id
select * from persoon AS p INNER JOIN ploeg AS ploeg ON p.ploeg_id =ploeg.id where ploeg.naam=?"
Update: no value in ploeg.naam? maybe issue here
p
ublic ArrayList<PersoonBag> zoekAlleSpelers() throws DBException, ApplicationException {
ArrayList<PersoonBag> pb = new ArrayList<>();
try (Connection conn = ConnectionManager.getConnection();) {
try(PreparedStatement stmt = conn.prepareStatement(
"select * from persoon inner join ploeg where persoon.ploeg_id = ploeg.id");) {
// execute voert elke sql-statement uit, executeQuery enkel de eenvoudige
stmt.execute();
// result opvragen (en automatisch sluiten)
try (ResultSet rs = stmt.getResultSet()) {
// van alle rekennigen uit de database,
// RekeningBag-objecten maken en in een RekeningVector steken
while (rs.next()) {
PersoonBag p = new PersoonBag();
PloegBag ploeg = new PloegBag();
// ploeg.setId(rs.getInt("id"));
ploeg.setNaam(rs.getString("naam"));
p.setId(rs.getInt("id"));
p.setNaam(rs.getString("naam"));
p.setVoornaam(rs.getString("voornaam"));
p.setGeboortedatum(rs.getDate("geboortedatum"));
p.setOpmerking(rs.getString("opmerking"));
p.setIsTrainer(rs.getBoolean("isTrainer"));
p.setPloeg_id(ploeg);
pb.add(p);
}
return pb;
} catch (SQLException sqlEx) {
throw new DBException(
"SQL-exception in zoekAlleRekeningen - resultset");
}
} catch (SQLException sqlEx) {
throw new DBException(
"SQL-exception in zoekAlleRekeningen - statement");
}
} catch (SQLException sqlEx) {
throw new DBException(
"SQL-exception in zoekAlleRekeningen - connection");
}
}
Still have'nt found the issue.. this is function to store the data from the sql query in the table note: this works only ploegname isn't showing
PersoonDB pdb = new PersoonDB();
ArrayList<PersoonBag> persoonbag = new ArrayList<>();
try {
ArrayList<PersoonBag> spelersLijst = pdb.zoekAlleSpelers();
for (PersoonBag r : spelersLijst) {
PersoonBag speler = new PersoonBag(r.getId(),r.getNaam(), r.getVoornaam(),r.getMyDate(),r.getOpmerking(), r.isIsTrainer(),r.getPloeg_id());
persoonbag.add(speler);
}
ObservableList<PersoonBag> spelers = FXCollections.observableArrayList(persoonbag);
taSpelers.setItems(spelers);
Cell items:
#FXML
private TableView<PersoonBag> taSpelers;
#FXML
private TableColumn tcFamilienaam;
#FXML
private TableColumn tcVoornaam;
#FXML
private TableColumn tcOpmerking;
#FXML
private TableColumn<PersoonBag, CustomDate> tcGeboortedatum;
#FXML
private TableColumn<PersoonBag, PloegBag> tcPloeg;
#Override
public void initialize(URL url, ResourceBundle rb) {
tcFamilienaam.setCellValueFactory(new PropertyValueFactory<>("naam"));
tcVoornaam.setCellValueFactory(new PropertyValueFactory<>("voornaam"));
tcGeboortedatum.setCellValueFactory(new PropertyValueFactory<PersoonBag, CustomDate>("geboortedatum"));
tcOpmerking.setCellValueFactory(new PropertyValueFactory<>("opmerking"));
tcPloeg.setCellValueFactory(new PropertyValueFactory<>("ploeg"));
tcPloeg.setCellFactory(tc -> new TableCell<PersoonBag, PloegBag>() {
#Override
public void updateItem(PloegBag ploeg, boolean empty) {
if (empty || ploeg ==null){
setText("");
} else{
setText(ploeg.getNaam());
}
}
});
UPDATE!!! i'm almost there! It's getting the 'naam' data from persoon instead of 'naam' from ploeg!
issue:
while (rs.next()) {
PloegBag ploeg = new PloegBag();
ploeg.setId(rs.getInt("id"));
ploeg.setNaam(rs.getString("naam"));
PersoonBag p = new PersoonBag();
p.setId(rs.getInt("id"));
p.setNaam(rs.getString("naam"));
p.setVoornaam(rs.getString("voornaam"));
p.setGeboortedatum(rs.getDate("geboortedatum"));
p.setOpmerking(rs.getString("opmerking"));
p.setIsTrainer(rs.getBoolean("isTrainer"));
p.setPloeg(ploeg);
pb.add(p);
}
when i'm putting niveau instead of 'naam' it's get me the correct matching result! now i need the name..!

Instead of storing the id of the linked item, store a reference to the item itself. So your PersoonBag class will look like:
public class PersoonBag {
private int id;
private String naam;
private String voornaam;
private Date geboortedatum;
private String opmerking;
private boolean isTrainer;
private PloegBag ploeg;
public PersoonBag(int id, String naam, String voornaam, Date geboortedatum, String opmerking,boolean isTrainer, PloegBag ploeg){
this.id=id;
this.naam=naam;
this.voornaam=voornaam;
this.geboortedatum=geboortedatum;
this.opmerking=opmerking;
this.isTrainer=isTrainer;
this.ploeg=ploeg;
}
public PersoonBag()
{
}
public PloegBag getPloeg() {
return ploeg ;
}
public void setPloeg(PloegBag ploeg) {
this.ploeg = ploeg ;
}
// other get/set methods ...
}
Now you can load everything at once using an inner join in the SQL:
String sql = "select * from persoon inner join ploeg where persoon.ploeg_id = ploeg.id";
PreparedStatement statement = connection.prepareStatement(sql);
ResultSet rs = statement.executeQuery();
List<Persoon> persoonList = new ArrayList<>();
while (rs.next()) {
PloegBag ploeg = new PloegBag();
// populate ploeg with data from rs...
PersoonBag persoon = new PersoonBag();
persoon.setPloeg(ploeg);
// populate persoon with remaining data from rs...
persoonList.add(persoon);
}
(Obviously you can modify the SQL code, e.g. to retrieve specific items from the database, or just generally to improve it, etc.)
Now your JavaFX code looks like:
TableView<PersoonBag> persoonTable = new TableView<>();
TableColumn<PersoonBag, PloegBag> tcPloeg = new TableColumn<>("Ploeg");
tcPloeg.setCellValueFactory(new PropertyValueFactory<>("ploeg"));
// other columns...
To get the cells to display the value you need from the PloegBag, there are two ways. The "quick and dirty" way is just to define a toString() method in the PloegBag class:
public class PloegBag {
// ...
#Override
public String toString() {
return naam ;
}
}
This isn't very satisfactory, though, as you might want to toString() method to do something else for other reasons in your application. The "proper" way is to use a cell factory:
tcPloeg.setCellFactory(tc -> new TableCell<PersoonBag, PloegBag>() {
#Override
public void updateItem(PloegBag ploeg, boolean empty) {
if (empty || ploeg == null) {
setText(null);
} else {
setText(ploeg.getNaam());
}
}
});

1) establish a Connection to your database from your Java-program by using JDBC:
private static Connection getDBConnection() {
Connection connection = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDatabase?autoReconnect=true&user=myUser&password=myPass");
} catch (ClassNotFoundException | SQLException e) {
System.out.println("Error on getDBCOnnection "+e.toString());
}
return connection;
}
2) Query your Items table in a query like this:
SELECT shopName FROM Items WHERE ID = 90
Java:
public static ResultSet runQuery(String query) {
if(conn == null){
conn = getDBConnection();
}
Statement stmt;
ResultSet rs;
try {
stmt = conn.createStatement();
rs = stmt.executeQuery(query);
return rs;
} catch (SQLException e) {
System.out.println(e + " " + e.getMessage());
return null;
}
}
3) Read the result
ResultSet rs = runQuery(query);
String result = rs.getString(1);

Hibernate could do it all for you, including queries... just saying... Although steep learning curve if doing it for the first time... You need to model your container object to have these fields, for example person would have:
class Person{
long id;
String name;
String shopName;
...
}
Then in your data service (provider of data) you would query for that, lets say:
SELECT p.id, p.name, s.name
FROM person p, shop s
WHERE p.shopId = s.shopId;
and provide simple rowmapper
#Ovrride
public Person mapRow(ResultSet rs, int rowNum) throws SQLException {
Person person = new Person(rs.getInt("personId"), rs.getString("personName"), rs.getString("shopName"));
return person;
}
You end up with list of Persons, which you can operate on within app. As someone mentioned earlier, you would want to do this, beforehand. Every time you need that list you would hit a local cache, instead of going back to DB. You could set a policy to refresh cache if needed.

The Return value is not true in arraylist of android App

This function returns two objects TMBase.customer#40fb1588, TMBase.customer#40fb1ad8, but I need to return these values emy, samera. I need to know what is the problem?
public ArrayList<TMBase.Customer> GetWorkerNameOfCustomerByID( int LineID)
{
ArrayList<TMBase.Customer> CustomerArr = new ArrayList<TMBase.Customer>();
connecttodatabase qq = new connecttodatabase();
qq.dbconnect();
if (qq.con != null)
{
String result = "";
ResultSet rs = null;
try {
CallableStatement cstmt = null;
Statement st = qq.con.createStatement();
cstmt = qq.con.prepareCall("{CALL GetWorkerNameOfCustomerByID(?)}");
cstmt.setInt(1, LineID);
rs = cstmt.executeQuery();
ResultSetMetaData rsmd = rs.getMetaData();
while(rs.next())
{
TMBase.Customer CustomerObj=new TMBase.Customer();
CustomerObj.setWorkerName(rs.getString("WorkerName"));
CustomerArr.add(CustomerObj);
}
} catch (SQLException e) {
e.printStackTrace();
}
qq.closeConnection();
}
return CustomerArr;
}
Customer class:
package TMBase;
public class Customer {
private int ID;
private int LineId;
private int WorkerId;
private Timestamp DateSubscribe;
private String WorkerName;
public int getID() {
return this.ID;
}
public int setID(int ID){
return this.ID = ID;
}
//////////////////////////////////////////////
public int getLineId() {
return this.LineId;
}
public int setLineId(int LineId){
return this.LineId = LineId;
}
//////////////////////////////////////////////
public int getWorkerId() {
return this.WorkerId;
}
public int setWorkerId(int WorkerId){
return this.WorkerId = WorkerId;
}
///////////////////////////////////////////////
public Timestamp getDateSubscribe() {
return this.DateSubscribe;`enter code here`
}
public Timestamp setDateSubscribe(Timestamp DateSubscribe){
return this.DateSubscribe = DateSubscribe;
}
///////////////////////////////////////////////
public String getWorkerName() {
return this.WorkerName;
}
public String setWorkerName(String WorkerName){
return this.WorkerName = WorkerName;
}
}

you need to override the toString() method of your Customer object.
I'm assuming you are using an ArrayAdapter to display these in your ListView, which calls toString() on each item in the dataset to display on the screen.
By overriding toString(), you can return whatever data you want to be displayed in the ListView for example:
public String toString(){
return getWorkerName();
}

What is the logic of creating the Mysql SELECT Statement for drop down in Struts + JSP?

can you please help me rectify the code below, I'm trying to create a populated drop down list in struts 2 in Eclipse as my IDE. This is my first time to use 'STRUTS' as well as 'IDE ECLIPSE'.
To be specific by the SELECT statement I do not know how to write the code that, when a user selects the 'Make' of the car, the database extracts the different 'Models' of that make. But other select items like 'Color', should be optional in that a user can proceed to search for the 'Make' minus choosing an option from them.
Please help I'm new in ActionClass and DataBase. Thanx in advance.
package drive;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.opensymphony.xwork2.ActionSupport;
public class CarSearch extends ActionSupport {
private String model;
private String modification;
private String engine;
private String color;
private String bodyType;
private String minPrice;
private String maxPrice;
private String mileage;
private int minYear;
private int maxYear;
private String make;
public String execute () {
String ret = NONE;
Connection conn = null;
try {
String URL = "jdbc:mysql://localhost/Cars";
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(URL, "root", "$jademedia247");
String sql = "SELECT make FROM type WHERE";
sql+=" model = ? AND modification = ? ";
PreparedStatement ps = conn.prepareStatement (sql);
ps.setString(1, model);
ps.setString(2, modification);
ResultSet rs = ps.executeQuery();
while (rs.next()){
make = rs.getString(1);
ret = SUCCESS;
}
} catch (Exception e) {
ret = ERROR;
} finally {
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
}
}
}
return ret;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public String getModification() {
return modification;
}
public void setModification (String modification) {
this.modification = modification;
}
public String getEngine() {
return engine;
}
public void setEngine (String engine) {
this.engine = engine;
}
public String getColor() {
return color;
}
public void setColor (String color) {
this.color = color;
}
public String getBodyType() {
return bodyType;
}
public void setBodyType(String bodyType) {
this.bodyType = bodyType;
}
public String getMinPrice() {
return minPrice;
}
public void setMinPrice(String minPrice) {
this.minPrice = minPrice;
}
public String getMaxPrice () {
return maxPrice;
}
public void setMaxPrice (String maxPrice) {
this.maxPrice = maxPrice;
}
public String getMileage () {
return mileage;
}
public void setMileage (String mileage) {
this.mileage = mileage ;
}
public int getMinYear() {
return minYear;
}
public void setMinYear(int minYear) {
this.minYear = minYear;
}
public int getMaxYear() {
return maxYear;
}
public void setMaxYear(int maxYear) {
this.maxYear = maxYear;
}
public String getMake() {
return make;
}
public void setMake(String make){
this.make = make;
}
}

PreparedStatement ps = conn.prepareStatement ("SELECT field_name FROM table_name WHERE model = ? AND modification = ? ");
ps.setString(1, model);
ps.setString(2, modification);
ResultSet rs = ps.executeQuery();
//it will help you

Throws Exception in netbeans when using GET

I'm trying to retrieve data from my Model class into textfield via GET, although nullpointexception is throwing an error
The code in the View class is =
public View_EditCustomer(Model_Customer cust) {
customer = cust;
txtname.setText(customer.GetFName());
txtSecondName.setText(customer.GetLName());
initComponents();
}
and in another View class it is =
private void btnSelectActionPerformed(java.awt.event.ActionEvent evt) {
ListSelectionModel rowSM = jTable1.getSelectionModel();
int row = rowSM.getMinSelectionIndex();
int Appointment_ID = (Integer)resultModel.getValueAt(row, 0);
Model_Customer cust = null;
try{
cust = Controller_ManageCustomer.GetCustomer(Appointment_ID);
new View_EditCustomer(cust).setVisible(true);
}catch(Exception ex){
JOptionPane.showMessageDialog(this,ex.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
}
}
Model_Customer code parts =
public static Model_Customer QueryID(int Appointment_ID) throws Exception
{
try{
Statement stmt = Model_Customer.conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM appointment WHERE appointmentid="+Appointment_ID+" LIMIT 1;");
if(rs.next())
return new Model_Customer(rs.getInt(1),rs.getString(2),rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9),rs.getString(10),rs.getString(11),rs.getString(12));
}catch(Exception e){
throw new Exception(e.getMessage());
}
return null;
}
private Model_Customer(int Appointment_ID, String FName, String LName, String Registration, String Make, String Model, String Engine, String Year, String Mileage, String Type, String Date, String Time)
{
this._Appointment_ID=Appointment_ID;
this._Type=Type;
this._Time=Time;
this._Date=Date;
this._FName=FName;
this._LName=LName;
this._Make=Make;
this._Model=Model;
this._Engine=Engine;
this._Year=Year;
this._Mileage=Mileage;
this._Registration=Registration;
this._inSync=true;
}
public int GetID()
{
return this._Appointment_ID;
}
public String GetFName()
{
return _FName;
}
public String GetLName()
{
return _LName;
}
public String GetRegistration()
{
return _Registration;
}
public String GetMake()
{
return _Make;
}
public String GetModel()
{
return _Model;
}
public String GetEngine()
{
return _Engine;
}
public String GetYear()
{
return _Year;
}
public String GetMileage()
{
return _Mileage;
}
public String GetType()
{
return _Type;
}
public String GetDate()
{
return _Date;
}
public String GetTime()
{
return _Time;
}
In debugging Model_Customer cust is actually populated by data and it actually goes to the end to txtname.setText(customer.GetFName()); goes to Model_Customer GetFName and should retrieve the name but throws an exception (int)0. Would really appreciate your help!!

Shouldn't initComponents(); be called before using TextViews ?
public View_EditCustomer(Model_Customer cust) {
initComponents();
customer = cust;
txtname.setText(customer.GetFName());
txtSecondName.setText(customer.GetLName());
}