Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 12

Before I append the record into the textfile, it's all ok, but when I append the record into textfile, it start to have error when i run the program. I now no idea where got wrong

first error

javaapplication1.LoginWindow.actionPerformed(LoginWindow.java:102) 

belongs to this line of code Dashboard d = new Dashboard();

second error

javaapplication1.Dashboard.<init>(Dashboard.java:200) 

belongs to this line of code data[i][12] = "" + std.getAcdmcq1();

Output Photo. This picture show the output of record that I append to the textfile

Below are the error shown

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 12
	at javaapplication1.Dashboard.<init>(Dashboard.java:200)
	at javaapplication1.LoginWindow.actionPerformed(LoginWindow.java:102)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

This is LoginWindow.java:

package javaapplication1;

import java.awt.Color;
import javax.swing.*;
import java.awt.event.*;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class LoginWindow extends JFrame implements ActionListener,ItemListener,MouseListener{
    private JLabel userName_label;
    private JTextField userName;
    private JLabel password_label;
    private JPasswordField password;
    private JButton loginButton;
    private JPanel panel;
    private JCheckBox display_pswrd;
    private JLabel noAccount;
    private JLabel role;
    private JComboBox roleCmb;
    
    
    public LoginWindow(){
        final int win_width = 300; //window width in pixels
        final int win_height = 250; //window height in pixels
        
        setTitle("Login"); //set this window's title
        setSize(win_width,win_height); //set the size of this window
        

        //Create the components here
        userName_label = new JLabel("Username: ");
        userName_label.setBounds(10,20,80,25);
        userName = new JTextField(15);
        userName.setBounds(100,20,165,25);
        password_label = new JLabel("Password: ");
        password_label.setBounds(10,50,80,25);
        password = new JPasswordField(15);
        password.setBounds(100,50,165,25);
        loginButton = new JButton("Login");
        loginButton.setBounds(80,140,80,25);
        loginButton.addActionListener(this); 
        role = new JLabel("Role: ");
        role.setBounds(10,80,80,25);
        String []roleList = {"","Admin","Lecturer"};
        roleCmb = new JComboBox(roleList);
        roleCmb.setBounds(100, 80, 165, 25);
        display_pswrd = new JCheckBox("Show password");
        display_pswrd.setBounds(100,110,165,25);
        display_pswrd.addItemListener(this);
        noAccount = new JLabel("Didn't have account ?");
        noAccount.setBounds(70,170,165,25);
        //set text color
        noAccount.setForeground(Color.BLUE); //set text color
        noAccount.addMouseListener(this);
        
        panel = new JPanel();
        //Set layout of the component which the component in the panel will align vertically
        panel.setLayout(null);
        panel.add(userName_label);
        panel.add(userName);
        panel.add(password_label);
        panel.add(password);
        panel.add(role);
        panel.add(roleCmb);
        panel.add(display_pswrd);
        panel.add(loginButton);
        panel.add(noAccount);
        
        //set border for the panel
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Panel is added to the JFrane's content panel
        getContentPane().add(panel);
        //Set this frame visible and display
        setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e){
        
        if(e.getSource() == loginButton){           
            //boolean usrFound = false;
            String usr = userName.getText();
            String pswrd = password.getText();
            String loginRole = roleCmb.getSelectedItem().toString();
            for(User user :AcademicSystem.allUser){  //for each user with details of username, password and role
                if(user.getLogin_username().equals(usr)&&user.getLogin_password().equals(pswrd)&&user.getRole().equals(loginRole)){
                    AcademicSystem.user = user;
                    System.out.println(user.getLogin_username() + "\t" + userName.getText());
                    System.out.println(user.getLogin_password() + "\t"  + password.getText());
                    System.out.println(user.getRole() + "\t"  + roleCmb.getSelectedItem().toString());
                    System.out.println("");
                }
            }
            
            if(AcademicSystem.user!=null){
                if(roleCmb.getSelectedItem()=="Admin"){
                    JOptionPane.showMessageDialog(loginButton,"Username and password matched!");
                    JOptionPane.showMessageDialog(loginButton, "User[" + userName.getText() + "] have successfully logged in as " + roleCmb.getSelectedItem().toString() );
                    setVisible(false);
                    Dashboard d = new Dashboard();
                    d.setVisible(true);
                    //usrFound = true;
                }else if(roleCmb.getSelectedItem()=="Lecturer"){
                    LecturerMenu lm = new LecturerMenu();
                    setVisible(false);
                    lm.setVisible(true);
                }
            }else{
                JOptionPane.showMessageDialog(loginButton,"User not found");
                AcademicSystem.user = null;
            } 
            
            try{
                PrintWriter p = new PrintWriter(new FileOutputStream("Logfile.txt", true)); //open the file in append mode
                //p.print("USERNAME\tROLE\t\tACTION\t\tLOGON_TIME\n");
                p.print(AcademicSystem.user.getLogin_username() + "\n");
                p.print(AcademicSystem.user.getRole()+ "\n");
                p.print("Login" + "\n");
                Calendar cal = Calendar.getInstance();
                SimpleDateFormat simpleformat = new SimpleDateFormat("dd/MMMM/yyyy hh:mm:s");
                p.print(simpleformat.format(cal.getTime())+"\n");
                p.println();
                p.close();
                
            }catch(Exception er){
                JOptionPane.showMessageDialog(this,er);
            }
            
            
        }  
    }
    
    //Detect the change of state of checkbox 
    public void itemStateChanged(ItemEvent ie){
        if (ie.getSource() == display_pswrd){
            if(display_pswrd.isSelected()){
                 // Setting a value of 0 indicates that you wish to see the text
                //as it is typed, similar to the behavior of a standard JTextField
                display_pswrd.setText("Hide Password");
                password.setEchoChar((char)0);
            }else{
                display_pswrd.setText("Show Password");
                password.setEchoChar('*');
            }
        }
    }
    
    public void mouseClicked(MouseEvent me){
        int a = JOptionPane.showConfirmDialog(null, "Do your want to a register a new account?");
        
        if (a == JOptionPane.YES_OPTION){
            setVisible(false);
            Register rg = new Register();
            rg.setVisible(true);
        }
        
        else{
            setVisible(true);
        }
    }
    
    public void mouseReleased(MouseEvent e){
     //...
    }
    public void mouseEntered(MouseEvent e){
        //...
    }
    public void mouseExited(MouseEvent e){
        //....
    }
    
    public void mousePressed(MouseEvent e){
        ///......
    }
}

This is my Dashboard.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.PrintWriter;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Dashboard extends JFrame implements ActionListener{
//declaration here
private JTabbedPane tp;
private JPanel studentPanel;
private JPanel enrolPanel;
private JLabel nameLabel;
private JTextField nameTextField;
private JLabel GenderLabel;
private JTextField GenderTxtField;
private JLabel raceLabel;
private JComboBox raceCmbBox;
private JComboBox genderCmbBox;
private JLabel icLabel;
private JTextField icTxtField;
private JLabel religionLabel;
private JTextField religionTxtField;
private JLabel NationalityLabel;
private JTextField nationalityTxtField;
private JLabel addressLabel;
private JTextField addressTxtField;
private JLabel emailLabel;
private JTextField emailTxtField;
private JLabel contactLabel;         
private JTextField contactTxtField; 
private JLabel maritalLabel;       
private JComboBox maritalCmb;
private JLabel postcodeLabel;
private JTextField postcodeTxtField;
private JLabel countryLabel;
private JComboBox countryCmb;
private JLabel acdmcLabel;
private JTable tbl;
private JLabel no1Label;
private JTextField no1TxtField;
private JLabel no2Label;
private JTextField no2TxtField;
private JLabel no3Label;
private JTextField no3TxtField;
private JLabel dataTableLabel;
private JButton registerButton;
private JButton editButton;
private JButton deleteButton;
private JButton gnrReportButton;
private JButton logoutButton;
public Dashboard(){
setSize(2000,500);
setTitle("Dashboard");
//component here
tp =new JTabbedPane();
studentPanel = new JPanel();
studentPanel.setLayout(null); //default layout is flow layout, set it to null so then easily to set the location of each component
nameLabel = new JLabel("Name: ");
nameLabel.setBounds(10,20,80,25);
nameTextField = new JTextField(25);
nameTextField.setBounds(100,20,165,25);
icLabel = new JLabel("IC Number: ");
icLabel.setBounds(10,50,80,25);
icTxtField = new JTextField(25);
icTxtField.setBounds(100,50,165,25);
GenderLabel = new JLabel("Gender: ");
GenderLabel.setBounds(300,20,165,25);
String[] genderList = {"","Male","Female","Other"};
genderCmbBox = new JComboBox(genderList);
genderCmbBox.setBounds(390,20,165,25);
raceLabel = new JLabel("Race:");
raceLabel.setBounds(300,50,80,25);
String[] raceList = {"","Malay","Chinese","Indians"};
raceCmbBox = new JComboBox(raceList);
raceCmbBox.setBounds(390,50,165,25);
religionLabel = new JLabel("Religion: ");
religionLabel.setBounds(10,80,80,25);
religionTxtField = new JTextField(15);
religionTxtField.setBounds(100,80,165,25);
NationalityLabel = new JLabel("Nationality: ");
NationalityLabel.setBounds(300,80,80,25);
nationalityTxtField = new JTextField(15);
nationalityTxtField.setBounds(390,80,165,25);
contactLabel = new JLabel("Contact:");
contactLabel.setBounds(10,110,165,25);
contactTxtField = new JTextField(15);
contactTxtField.setBounds(100,110,165,25);
maritalLabel = new JLabel("Marital");
maritalLabel.setBounds(300,110,165,25);
String []maritalStatus_List = {"","Single","Married"}; 
maritalCmb = new JComboBox(maritalStatus_List);
maritalCmb.setBounds(390,110,165,25);       
postcodeLabel = new JLabel("Postcode:");
postcodeLabel.setBounds(10,140,165,25);
postcodeTxtField = new JTextField(15);
postcodeTxtField.setBounds(100,140,165,25);
countryLabel = new JLabel("Country:");
countryLabel.setBounds(300,140,165,25);
String []countryList = {"","Sarawak","Sabah"};
countryCmb = new JComboBox(countryList);
countryCmb.setBounds(390,140,165,25);
addressLabel = new JLabel("Address: ");
addressLabel.setBounds(10,170,165,25);
addressTxtField = new JTextField(30);
addressTxtField.setBounds(100,170,455,25);
emailLabel = new JLabel("Email:");
emailLabel.setBounds(10,200,165,25);
emailTxtField = new JTextField(30);
emailTxtField.setBounds(100,200,455,25);
acdmcLabel = new JLabel("Academic Qualification");
acdmcLabel.setBounds(10,230,165,25);
no1Label = new JLabel("1.");
no1Label.setBounds(10,260,165,25);
no1TxtField = new JTextField(15);
no1TxtField.setBounds(40,260,520,25);
no2Label = new JLabel("2.");
no2Label.setBounds(10,290,165,25);
no2TxtField = new JTextField(15);
no2TxtField.setBounds(40,290,520,25);
no3Label = new JLabel("3");
no3Label.setBounds(10,320,165,25);
no3TxtField = new JTextField(15);
no3TxtField.setBounds(40,320,520,25);
dataTableLabel = new JLabel("Record Table: ");
dataTableLabel.setBounds(580,1,165,25);
registerButton = new JButton("Register");
registerButton.setBounds(600,360,165,25);
registerButton.addActionListener(this);
editButton = new JButton("Edit");
editButton.setBounds(800,360,165,25);
deleteButton = new JButton("Delete");
deleteButton.setBounds(1000,360,165,25);
gnrReportButton = new JButton("Generate Report");
gnrReportButton.setBounds(1200,360,165,25);
logoutButton = new JButton("Logout");
logoutButton.setBounds(1400,360,165,25);
logoutButton.addActionListener(this);       
int size = AcademicSystem.allStdInfo.size();
String[][]data = new String[size][12];
for(int i =0; i<size; i++){
Student std = AcademicSystem.allStdInfo.get(i);
data[i][0] = std.getName();
data[i][1]  = "" +  std.getIc();
data[i][2]  = "" +  std.getRace();
data[i][3]  = "" +  std.getGender();
data[i][4]  = "" +  std.getReligion();
data[i][5]  = "" +  std.getNationality();
data[i][6]  = "" +  std.getContact();
data[i][7]  = "" +  std.getMarital();
data[i][8]  = "" +  std.getPostcode();
data[i][9]  = "" +  std.getCountry();
data[i][10] = "" +  std.getAddress();
data[i][11] = "" +  std.getEmail();
data[i][12] = "" +  std.getAcdmcq1();
}     
String[]columns = {"Name","Ic","Race","Gender","Religion","Nationality","Contact","Marital","Postcode","Country","Address","Email","Academic Qualification"};
DefaultTableModel model = new DefaultTableModel(data,columns);
tbl= new JTable(model);
JScrollPane sp = new JScrollPane(tbl);
sp.setBounds(580,20,1335,325);
studentPanel.add(nameLabel);
studentPanel.add(nameTextField);
studentPanel.add(icLabel);
studentPanel.add(icTxtField);
studentPanel.add(raceLabel);
studentPanel.add(raceCmbBox);
studentPanel.add(GenderLabel);
studentPanel.add(genderCmbBox);
studentPanel.add(religionLabel);
studentPanel.add(religionTxtField);
studentPanel.add(NationalityLabel);
studentPanel.add(nationalityTxtField);
studentPanel.add(contactLabel);
studentPanel.add(contactTxtField);
studentPanel.add(maritalLabel);
studentPanel.add(maritalCmb);
studentPanel.add(addressLabel);
studentPanel.add(addressTxtField);
studentPanel.add(postcodeLabel);
studentPanel.add(postcodeTxtField);
studentPanel.add(countryLabel);
studentPanel.add(countryCmb);
studentPanel.add(emailLabel);
studentPanel.add(emailTxtField);
studentPanel.add(acdmcLabel);
studentPanel.add(no1Label);
studentPanel.add(no1TxtField);
studentPanel.add(no2Label);
studentPanel.add(no2TxtField);
studentPanel.add(no3Label);
studentPanel.add(no3TxtField);
studentPanel.add(dataTableLabel);
studentPanel.add(sp);
studentPanel.add(registerButton);
studentPanel.add(editButton);
studentPanel.add(deleteButton);
studentPanel.add(gnrReportButton);
studentPanel.add(logoutButton);
enrolPanel = new JPanel();
tp.add("Student",studentPanel);
tp.add("Enrolment",enrolPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Panel is added to the JFrane's content panel
getContentPane().add(tp);
//Set this frame visible to be display
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e){
if(e.getSource()==logoutButton){
setVisible(false);
AcademicSystem.user = null;
LoginWindow lg = new LoginWindow();
lg.setVisible(true);
}
else if(e.getSource()==registerButton){
String name = nameTextField.getText();
String ic = icTxtField.getText();
String race = raceCmbBox.getSelectedItem().toString();
String gender = genderCmbBox.getSelectedItem().toString();
String religion = religionTxtField.getText();
String nationality = nationalityTxtField.getText();
String contact = contactTxtField.getText();
String marital = maritalCmb.getSelectedItem().toString();
String address = addressTxtField.getText();
String postcode = postcodeTxtField.getText();
String country = countryCmb.getSelectedItem().toString();
String email = emailTxtField.getText();
String acdmc = no1TxtField.getText()+" ," + no2TxtField.getText()+" ,"+no3TxtField.getText();
if(!name.equals("")&&!ic.equals("")&&!race.equals("")&&!gender.equals("")&&!religion.equals("")&&!nationality.equals("")&&!contact.equals("")&&!marital.equals("")&&!address.equals("")&&!postcode.equals("")&&!country.equals("")&&!email.equals("")&&!no1TxtField.equals("")&&!no2TxtField.equals("")&&!no3TxtField.equals("")){
JOptionPane.showMessageDialog(this,"Profile registered successfully");
boolean found = false;
for(int i=0; i<AcademicSystem.allStdInfo.size(); i++){
Student std = AcademicSystem.allStdInfo.get(i);
if(name.equals(std.getName())){
found = true;
break;
}
}
if(!found){
Student std = new Student(name,Integer.parseInt(ic),race,gender,religion,nationality,Integer.parseInt(contact),marital,Integer.parseInt(postcode),country,address,email,acdmc);
AcademicSystem.allStdInfo.add(std);
DefaultTableModel model1 = (DefaultTableModel)tbl.getModel();
model1.addRow(new Object[]{name,ic,race,gender,religion,nationality,contact,marital,postcode,country,address,email,acdmc});
}else{
JOptionPane.showMessageDialog(this,"This user is exists in the record");
}
}else if(e.getSource()==editButton){
try{
PrintWriter p = new PrintWriter("StudentInfo.txt");
for(int i=0; i<AcademicSystem.allStdInfo.size(); i++){
Student stdnt = AcademicSystem.allStdInfo.get(i);
p.println(stdnt.getName());
p.println(stdnt.getIc());
p.println(stdnt.getRace());
p.println(stdnt.getGender());
p.println(stdnt.getReligion());
p.println(stdnt.getNationality());
p.println(stdnt.getContact());
p.println(stdnt.getMarital());
p.println(stdnt.getPostcode());
p.println(stdnt.getCountry());
p.println(stdnt.getAddress());
p.println(stdnt.getEmail());
p.println(stdnt.getAcdmcq1());
p.println();
}
p.close();
}catch(Exception er){
}
}
}
}
}

Java arrays are 0 indexed that means they start at zero,and the largest index is the length minus 1.

If you declare an array, and try to access an element beyond the length you get the exact error you are getting.

String[] data = new String[12];
data[12] = "this is an error";

Make your array bigger.

String[] data = new String[13];
data[12] = "this is fine";

This might be confusing if you are used to 1 base indexes.

More specifically, in your code you declare an array.

String[][]data = new String[size][12];

Then you try to access that array in a for loop.

data[i][12] = "" +  std.getAcdmcq1();

Note,that this code will not get run if size is = 0 because of the for loop condition.