I need help! Urgent!

**Hyaki** · June 20th, 2012, 09:45 AM

im constructing a GUI Order System using java. After everything was set, i got this error :

Exception in thread "main" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1090)
at java.awt.Container.add(Container.java:410)
at GUI.<init>(GUI.java:264)
at GUI.main(GUI.java:298)

Process completed.

Can any1 tell me wats wrong with my coding? Thank you. I separate this software into 2 .java file and they should be linked.

GUI.java :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUI extends JFrame implements ActionListener
{
	private JTabbedPane body;
	private JPanel pEntry = new JPanel();
	private JPanel pButton = new JPanel();
	private JPanel pButton2 = new JPanel();
	private JPanel pButton3 = new JPanel();
	private JPanel pDisplay = new JPanel();
	private JPanel pSearch = new JPanel();
	private JPanel pBeer1 = new JPanel();
	private JPanel pBeer2 = new JPanel();
	private JPanel pBeer3 = new JPanel();
	private JPanel pBeer4 = new JPanel();
	private JPanel pBeer5 = new JPanel();
	private int counter = 0;
	private int counter2 = 0;
	private JLabel lblTitle,lblID,lblName,lblbeer,lblbeer1,lblbeer2,lblbeer3,lblbeer4,lblbeer5;
	private JLabel lblAmount;
	private JLabel lblTitled,lblIDd,lblNamed,lblbeerd,lblbeer1d,lblbeer2d,lblbeer3d,lblbeer4d,lblbeer5d;
	private JLabel lblAmountd;
	private JLabel lblTitleR,lblIDR,lblNameR,lblbeerR,lblbeer1R,lblbeer2R,lblbeer3R,lblbeer4R,lblbeer5R;
	private JLabel lblAmountR;
	private JLabel lblTitle1,lblSearch,lblID1,lblName1,lblbeer1a,lblbeer11,lblbeer21,lblbeer31,lblbeer41,lblbeer51;
	private JLabel lblAmount1;
	private JLabel lblID2,lblName2,lblbeer2a,lblbeer12,lblbeer22,lblbeer32,lblbeer42,lblbeer52;
	private JLabel lblAmount2;
	private JLabel lblBlank,lblBlank2,lblBlank3;
	private JTextField txtID,txtName,txtSearch,txtBQty1,txtBQty2,txtBQty3,txtBQty4,txtBQty5;
	private JButton btnReset,btnSave,btnPrevious,btnNext,btnDisplay,btnSearch;
	String choice;
	private boolean flag,flag2=false,flag3=false;
	Order[]orderRec;
	public GUI()
	{
		super("Order");
		body = new JTabbedPane();
		Font customFont = new Font("Arial Black",Font.PLAIN,20);
		Font customFont2 = new Font("Arial",Font.BOLD,12);
		Color customBlue = new Color(50,150,255);
		Color customRed = new Color(255,150,150);
		Color customYellow = new Color(255,200,100);
		Color customGray = new Color(230,230,230);
 
	lblTitle = new JLabel("ORDER");
	lblID = new JLabel(counter+1 +". Customer No:");
	lblName = new JLabel("Staff Name:");
	lblbeer = new JLabel("Beverage:");
	lblbeer1 = new JLabel("Starker in cup(RM30)");
	lblbeer2 = new JLabel("Starker in barrel(RM300)");
	lblbeer3 = new JLabel("Chivas(RM228)");
	lblbeer4 = new JLabel("Johnny walker's(RM234)");
	lblbeer5 = new JLabel("Bacardi(RM228)");
	lblAmount = new JLabel("Amount:");
	lblBlank = new JLabel();
	lblBlank2 = new JLabel();
	lblBlank3 = new JLabel();
	lblTitled = new JLabel("RECORD");
	lblIDd = new JLabel(counter2+1 +". Customer No.:");
	lblNamed = new JLabel("Staff Name:");
	lblbeerd = new JLabel("Beverage:");
	lblbeer1d = new JLabel("Starker in cup(RM30)");
	lblbeer2d = new JLabel("Starker in barrel(RM300)");
	lblbeer3d = new JLabel("Chivas(RM228)");
	lblbeer4d = new JLabel("Johnny walker's(RM234)");
	lblbeer5d = new JLabel("Bacardi(RM228)");
	lblAmount = new JLabel("Amount:");
	lblIDR = new JLabel();
	lblNameR = new JLabel();
	lblbeerR = new JLabel();
	lblbeer1R = new JLabel();
	lblbeer2R = new JLabel();
	lblbeer3R = new JLabel();
	lblbeer4R = new JLabel();
	lblbeer5R = new JLabel();
	lblAmount = new JLabel();
	lblTitle1 = new JLabel("SEARCH RECORD");
	lblSearch = new JLabel("Search Customer No.");
	lblName1 = new JLabel("Staff Name:");
	lblbeer1a = new JLabel("Beverage:");
	lblbeer11 = new JLabel("Starker in cup(RM30)");
	lblbeer21 = new JLabel("Starker in barrel(RM300)");
	lblbeer31 = new JLabel("Chivas(RM228)");
	lblbeer41 = new JLabel("Johnny walker's(RM234)");
	lblbeer51 = new JLabel("Bacardi(RM228)");
	lblAmount1 = new JLabel("Amount:");
	lblName2 = new JLabel();
	lblbeer2a = new JLabel();
	lblbeer12 = new JLabel();
	lblbeer22 = new JLabel();
	lblbeer32 = new JLabel();
	lblbeer42 = new JLabel();
	lblbeer52 = new JLabel();
	lblAmount2 = new JLabel();
	txtID = new JTextField("",20);
	txtName = new JTextField("",20);
	txtBQty1 = new JTextField("",20);
	txtBQty2 = new JTextField("",20);
	txtBQty3 = new JTextField("",20);
	txtBQty4 = new JTextField("",20);
	txtBQty5 = new JTextField("",20);
	txtSearch = new JTextField("",20);
	btnReset = new JButton("RESET");
	btnReset.setFont(customFont2);
	btnReset.setBackground(customBlue);
	btnReset.setForeground(Color.white);
	btnReset.addActionListener(this);
	btnSave = new JButton("SAVE");
	btnSave.setFont(customFont2);
	btnSave.setBackground(customBlue);
	btnSave.setForeground(Color.white);
	btnSave.addActionListener(this);
	//btnTotal = new JButton("TOTAL");
	//btnTotal.setFont(customFont2);
	//btnTotal.setBackground(customBlue);
	//btnTotal.setForeground(Color.white);
	//btnTotal.addActionListener(this);
	//btnTotal = new JButton("TOTAL");
	//btnTotal.setFont(customFont2);
	//btnTotal.setBackground(customBlue);
	//btnTotal.setForeground(Color.white);
	//btnTotal.addActionListener(this);
	btnNext = new JButton("NEXT");
	btnNext.setFont(customFont2);
	btnNext.setBackground(customBlue);
	btnNext.setForeground(Color.white);
	btnNext.addActionListener(this);
	btnNext.setEnabled(false);
	btnPrevious = new JButton("PREVIOUS");
	btnPrevious.setFont(customFont2);
	btnPrevious.setBackground(customBlue);
	btnPrevious.setForeground(Color.white);
	btnPrevious.addActionListener(this);
	btnPrevious.setEnabled(false);
	btnDisplay = new JButton("DISPLAY");
	btnDisplay.setFont(customFont2);
	btnDisplay.setBackground(customBlue);
	btnDisplay.setForeground(Color.white);
	btnDisplay.addActionListener(this);
	btnDisplay.setEnabled(false);
	btnSearch = new JButton("SEARCH");
	btnSearch.setFont(customFont2);
	btnSearch.setBackground(customBlue);
	btnSearch.setForeground(Color.white);
	btnSearch.addActionListener(this);
	btnSearch.setEnabled(false);
	String input = JOptionPane.showInputDialog("Enter number of items in the array");
	int num = Integer.parseInt(input);
	orderRec = new Order[num];
	for(int j=0;j<orderRec.length;j++)
	{
		orderRec[j] = new Order();
	}
	pEntry.setLayout(new GridLayout(13,2,0,2));
	lblTitle.setBackground(customBlue);
	lblTitle.setForeground(Color.black);
	lblTitle.setFont(customFont);
	lblBlank.setBackground(customBlue);
	pEntry.add(lblTitle);
	pEntry.add(lblBlank);
	pEntry.add(lblID);
	pEntry.add(txtID);
	pEntry.add(lblName);
	pEntry.add(txtName);
	pEntry.add(lblbeer);
	pEntry.add(new JLabel());
	pEntry.add(lblbeer1);
	pBeer1.setLayout(new GridLayout(0,4,0,2));
	pBeer1.add(txtBQty1);
	pBeer1.add(new JLabel());
	pBeer1.add(new JLabel());
	pBeer1.add(new JLabel());
	pEntry.add(pBeer1);
	pEntry.add(lblbeer2);
	pBeer2.setLayout(new GridLayout(0,4,0,2));
	pBeer2.add(txtBQty2);
	pBeer2.add(new JLabel());
	pBeer2.add(new JLabel());
	pBeer2.add(new JLabel());
	pEntry.add(pBeer2);
	pEntry.add(lblbeer3);
	pBeer3.setLayout(new GridLayout(0,4,0,2));
	pBeer3.add(txtBQty3);
	pBeer3.add(new JLabel());
	pBeer3.add(new JLabel());
	pBeer3.add(new JLabel());
	pEntry.add(pBeer3);
	pEntry.add(lblbeer4);
	pBeer4.setLayout(new GridLayout(0,4,0,2));
	pBeer4.add(txtBQty4);
	pBeer4.add(new JLabel());
	pBeer4.add(new JLabel());
	pBeer4.add(new JLabel());
	pEntry.add(pBeer4);
	pEntry.add(lblbeer5);
	pBeer5.setLayout(new GridLayout(0,4,0,2));
	pBeer5.add(txtBQty5);
	pBeer5.add(new JLabel());
	pBeer5.add(new JLabel());
	pBeer5.add(new JLabel());
	pEntry.add(pBeer5);
	pEntry.add(lblAmount);
	pEntry.add(new JLabel());
	pEntry.add(new JLabel());
	pEntry.add(new JLabel());
	pButton.setLayout(new GridLayout(0,3,3,2));
	pButton.add(new JLabel());
	//pButton.add(btnTotal);
	pButton.add(btnReset);
	pButton.add(btnSave);
	pEntry.add(pButton);
	pEntry.add(new JLabel());
	pEntry.add(new JLabel());
	lblTitled.setBackground(customRed);
	lblTitled.setForeground(Color.black);
	lblTitled.setFont(customFont);
	lblBlank2.setBackground(customRed);
	pDisplay.setLayout(new GridLayout(15,2,0,2));
	pDisplay.add(lblTitled);
	pDisplay.add(lblBlank2);
	pDisplay.add(lblIDd);
	pDisplay.add(lblIDR);
	pDisplay.add(lblNamed);
	pDisplay.add(lblNameR);
	pDisplay.add(lblbeer);
	pDisplay.add(new JLabel());
	pDisplay.add(lblbeer1d);
	pDisplay.add(lblbeer1R);
	pDisplay.add(lblbeer2d);
	pDisplay.add(lblbeer2R);
	pDisplay.add(lblbeer3d);
	pDisplay.add(lblbeer3R);
	pDisplay.add(lblbeer4d);
	pDisplay.add(lblbeer4R);
	pDisplay.add(lblbeer5d);
	pDisplay.add(lblbeer5R);
	pDisplay.add(lblAmount);
	pDisplay.add(new JLabel());
	pDisplay.add(new JLabel());
	pDisplay.add(new JLabel());
	pButton2.setLayout(new GridLayout(0,3,3,2));
	pButton2.add(btnDisplay);
	pButton2.add(btnPrevious);
	pButton2.add(btnNext);
	pDisplay.add(pButton2);
	pDisplay.add(new JLabel());
	pDisplay.add(new JLabel());
	lblTitle1.setBackground(customYellow);
	lblTitle1.setForeground(Color.black);
	lblTitle1.setFont(customFont);
	lblBlank3.setBackground(customYellow);
	pSearch.setLayout(new GridLayout(15,2,0,2));
	pSearch.add(lblTitle1);
	pSearch.add(lblBlank3);
	pSearch.add(lblSearch);
	pButton3.setLayout(new GridLayout(0,2,2,2));
	pButton3.add(txtSearch);
	pButton3.add(btnSearch);
	pSearch.add(pButton3);
	pSearch.add(new JLabel());
	pSearch.add(new JLabel());
	pSearch.add(lblID1);
	pSearch.add(lblID2);
	pSearch.add(lblName1);
	pSearch.add(lblName2);
	pSearch.add(lblbeer1a);
	pSearch.add(new JLabel());
	pSearch.add(lblbeer11);
	pSearch.add(lblbeer12);
	pSearch.add(lblbeer21);
	pSearch.add(lblbeer22);
	pSearch.add(lblbeer31);
	pSearch.add(lblbeer32);
	pSearch.add(lblbeer41);
	pSearch.add(lblbeer42);
	pSearch.add(lblbeer51);
	pSearch.add(lblbeer52);
	pSearch.add(lblAmount1);
	pSearch.add(lblAmount2);
	pSearch.add(new JLabel());
	pSearch.add(new JLabel());
	body.addTab("RECORD",null,pEntry,"Entry Record");
	body.addTab("DISPLAY",null,pEntry,"Display Record");
	body.addTab("SEARCH",null,pEntry,"Search Record");
	body.setBackgroundAt(0,customBlue);
	body.setBackgroundAt(1,customRed);
	body.setBackgroundAt(2,customYellow);
	body.setBackground(customGray);
	add(body);
	setSize(580,430);
	setVisible(true);
 
	}//End of GUI
public static void main(String[] args)throws AWTException
{
	GUI adm = new GUI();
	adm.addWindowListener(
		new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		}
	);
}//End of main
public void actionPerformed(ActionEvent ae)
{
	if(ae.getSource()== btnReset)
	{
		Reset();
	}
	if(ae.getSource()== btnSave)
	{
		if(flag == false)
		{
			Validate();
		}
		if(flag == true)
		{
			Save();
			Reset();
			if(counter == 0)
			{
				btnNext.setEnabled(false);
			}
			else if(flag == true)
			{
				btnNext.setEnabled(true);
			}
			counter++;
			if(counter == 1)
			{
				btnDisplay.setEnabled(true);
				btnSearch.setEnabled(true);
			}
		}
		lblID.setText(counter+1 +".Customer No. :");
		if(counter >= orderRec.length)
		{
			counter = 0;
			lblID.setText(counter+1 +".Customer No. :");
		}
		flag = false;
	}
	if(ae.getSource()== btnDisplay)
	{
	Display();
	flag3 = true;
	btnDisplay.setEnabled(false);
	if(counter == 1)
	{
		btnNext.setEnabled(false);
	}
	if(counter != 1)
	{
		btnNext.setEnabled(true);
	}
	if(ae.getSource()== btnNext)
	{
		counter2++;
		if(counter2 == (counter-1))
		{
			btnNext.setEnabled(false);
		}
		else
		{
			btnNext.setEnabled(true);
		}
		if(counter2 == 4)
		{
			btnNext.setEnabled(false);
		}
		btnPrevious.setEnabled(true);
		lblID.setText(counter2+1 +".Customer No. :");
		Display();
	}
	if(ae.getSource()== btnPrevious)
	{
		counter2--;
		if(counter == 0)
		{
			btnPrevious.setEnabled(false);
		}
		else
		{
			btnPrevious.setEnabled(true);
		}
		btnNext.setEnabled(true);
		lblID.setText(counter2+1 +".Customer No. :");
		Display();
	}
	if(ae.getSource()== btnSearch)
	{
		Validate2();
		Search();
	}
	}
}// End of actionPerformed
 
//---Reset---
public void Reset()
{
	txtID.setText("");
	txtName.setText("");
	txtBQty1.setText("");
	txtBQty2.setText("");
	txtBQty3.setText("");
	txtBQty4.setText("");
	txtBQty5.setText("");
}// End of reset
 
//---Save Record---
public void Save()
{
	String name,temp;
	int customer,Quantity1,Quantity2,Quantity3,Quantity4,Quantity5;
	String temp1,temp2,temp3,temp4,temp5;
 
	temp1 = txtID.getText();
	customer = Integer.parseInt(temp1);
	orderRec[counter].setCustomerNo(customer);
	name = txtName.getText();
	orderRec[counter].setStaffName(name);
	temp1 = txtBQty1.getText();
	Quantity1 = Integer.parseInt(temp1);
	orderRec[counter].setQuantityA(Quantity1);
	temp2 = txtBQty2.getText();
	Quantity2 = Integer.parseInt(temp2);
	orderRec[counter].setQuantityB(Quantity2);
	temp3 = txtBQty3.getText();
	Quantity3 = Integer.parseInt(temp3);
	orderRec[counter].setQuantityC(Quantity3);
	temp4 = txtBQty4.getText();
	Quantity4 = Integer.parseInt(temp4);
	orderRec[counter].setQuantityD(Quantity4);
	temp5 = txtBQty5.getText();
	Quantity5 = Integer.parseInt(temp5);
	orderRec[counter].setQuantityE(Quantity5);
}// End of save
 
//---Dispaly Record---
 public void Display()
 {
 	int temp2;
 	String temp3;
 	double temp4;
 	temp2 = orderRec[counter2].getCustomerNo();
 	temp3 = Integer.toString(temp2);
 	lblIDR.setText(temp3);
 	lblNameR.setText(orderRec[counter2].getStaffName());
 	temp2 = orderRec[counter2].getQuantityA();
 	temp3 = Integer.toString(temp2);
 	lblbeer1R.setText(temp3);
 	temp2 = orderRec[counter2].getQuantityB();
 	temp3 = Integer.toString(temp2);
 	lblbeer2R.setText(temp3);
 	temp2 = orderRec[counter2].getQuantityC();
 	temp3 = Integer.toString(temp2);
 	lblbeer3R.setText(temp3);
 	temp2 = orderRec[counter2].getQuantityD();
 	temp3 = Integer.toString(temp2);
 	lblbeer4R.setText(temp3);
 	temp2 = orderRec[counter2].getQuantityE();
 	temp3 = Integer.toString(temp2);
 	lblbeer5R.setText(temp3);
 
 
 }// End of Display
 
 //---Search Record---
 public void Search()
 {
 	String str, temp7;
 	int a,cust,temp6,temp8,count=0;
 	double temp9;
 
 	flag2 = true;
 	//int[] idArray = new int[orderRec.length];
 	str = txtSearch.getText();
 	a = Integer.parseInt(str);
 	for(int k=0;k<orderRec.length;k++)
 	{
 		//idArray[k] = orderRec[k].getCustomerNo();
 		if(orderRec[k].getCustomerNo() == a)
 		{
 			flag2=true;
 			temp6 = orderRec[k].getCustomerNo();
 			temp7 = Integer.toString(temp6);
 			lblIDR.setText(temp7);
 			lblNameR.setText(orderRec[k].getStaffName());
 			temp6 = orderRec[k].getQuantityA();
 			temp7 = Integer.toString(temp6);
 			lblbeer1R.setText(temp7);
 			temp6 = orderRec[k].getQuantityB();
 			temp7 = Integer.toString(temp6);
 			lblbeer2R.setText(temp7);
 			temp6 = orderRec[k].getQuantityC();
 			temp7 = Integer.toString(temp6);
 			lblbeer3R.setText(temp7);
 			temp6 = orderRec[k].getQuantityD();
 			temp7 = Integer.toString(temp6);
 			lblbeer4R.setText(temp7);
 			temp6 = orderRec[k].getQuantityE();
 			temp7 = Integer.toString(temp6);
 			lblbeer5R.setText(temp7);
 
 			break;
 		}
 		else if(!(orderRec[k].getCustomerNo() == a))
 		{
 			flag2 = false;
 		}
 	}
 	if(flag2 == false)
 	JOptionPane.showMessageDialog(this,"Record not found.");
 }// End of Search
 
 //---Validation Checking---
 public void Validate()throws ArithmeticException
 {
 	flag = false;
 	int c = 0;
 	try{
 		c =Integer.parseInt(txtID.getText());
 	}catch(NumberFormatException nfx){
 		JOptionPane.showMessageDialog(this,"Invalid Customer No.");
 	}
 	if(txtID.getText().equals("")||txtName.getText().equals("")){
 		JOptionPane.showMessageDialog(this,"Please fill in staff name and customer no.");
 	}
 	else if(!txtName.getText().matches("([a-zA-Z]+|[a-zA-Z]+\\s[a-zA-Z]+)*")){
 		JOptionPane.showMessageDialog(this,"Invalid Name");
 		txtName.requestFocus();
 	}
 	else{
 		flag = true;
 	}
 
 }// End of Validation
 
 //---Search Validation Checking---
 public void Validate2(){
 	if(txtSearch.getText().equals("")){
 		JOptionPane.showMessageDialog(this,"Please search ID");
 		txtSearch.requestFocus();
 	}
 }// End of Search Validation Checking
}// End of class

Order.java :

public class Order
{
	//Instant variables
	String staffName;
	int customerNo;
	int quantityA,quantityB,quantityC,quantityD,quantityE;
	int amount;
 
 
 
//Setter and Getter
public void setStaffName(String sName)
{
	staffName = sName;
}
public String getStaffName()
{
	return staffName;
}
public void setCustomerNo(int CN)
{
	customerNo = CN;
}
public int getCustomerNo()
{
	return customerNo;
}
public void setQuantityA(int QtA)
{
	quantityA = QtA;
}
public int getQuantityA()
{
	return quantityA;
}
public void setQuantityB(int QtB)
{
	quantityB = QtB;
}
public int getQuantityB()
{
	return quantityB;
}
public void setQuantityC(int QtC)
{
	quantityC = QtC;
}
public int getQuantityC()
{
	return quantityC;
}
public void setQuantityD(int QtD)
{
	quantityD = QtD;
}
public int getQuantityD()
{
	return quantityD;
}
public void setQuantityE(int QtE)
{
	quantityE = QtE;
}
public int getQuantityE()
{
	return quantityE;
}
//Calculate amount
}

**KevinWorkman** · June 20th, 2012, 09:53 AM

Please read the link in my signature on asking questions the smart way, especially the bit about using meaningful titles as well as not mentioning your deadline or urgency (otherwise you come off as impatient and rude).

Then follow the advice here: http://www.javaprogrammingforums.com...t-println.html

If you're still stuck, then please narrow your problem down to an SSCCE by eliminating any extraneous code that does not directly attribute to the problem. An SSCCE should only be a few lines long.

**Norm** · June 20th, 2012, 10:59 AM

Exception in thread "main" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1090)
at java.awt.Container.add(Container.java:410)
at GUI.<init>(GUI.java:264)

What code is at line 264 in the GUI class? Do any of the variables on that line have a null value?

**javapenguin** · June 20th, 2012, 11:03 AM

You posted the GUI class twice it looks like.

**wuppy29** · June 20th, 2012, 12:01 PM

Exception in thread "main" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1090)
at java.awt.Container.add(Container.java:410)
at GUI.<init>(GUI.java:264)
at GUI.main(GUI.java:298)

There is some kind of error with your Container.
At line 410 you add something that is broken. And I'm pretty sure you have made this at line 1090.
298 is the error when you try to load the program. It has an error in the file, so it gives an error there.
I don't know what the error on line 264 is though.

**Norm** · June 20th, 2012, 12:39 PM

@wuppy29 - You need to review what is shown in a stack trace.
Line 298 in the main() method calls the GUI class's constructor
Line 264 in the constructor calls the add() method of a container <<< This is the OPs code
LIne 410 is in the Container class in the java.awt package <<< This was written by Sun
Line 1090 is where the NPE exception was thrown. Probably because the argument to the add() method called on line 264 was null.

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Re: I need help! Urgent!

Re: I need help! Urgent!

Re: I need help! Urgent!

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