Is WL6's ServletContext and HttpSession implementation Serializable?
As the subject stated
Rgds,
Raymond Mok
No, they are not serializable.
mark
Raymond Mok wrote:
> As the subject stated
>
> Rgds,
> Raymond Mok
Similar Messages
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Problem with writing and reading using serialization
I am having a problem with writing and reading an object that has another object in it. The purpose of the class is to write a order that has multiple items in it. And there will be several orders. This is for an IB project, where one of the requirements is to utilize a hierarchical composite data structure. That is, it is "one that contains more than one element and at least one of the elements is a composite data structure. Examples are, an array or linked list of records, a record that has one field that is another record, or an array". The code is shown below:
The error produced is
java.lang.NullPointerException
at SamsonRubberIndustries.CustomerOrderDetails.createCustOrdDetailsScreen(CustomerOrderDetails.java:150)
at SamsonRubberIndustries.CustomerOrderDetails$1.run(CustomerOrderDetails.java:78)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
public class CustOrdObject implements Serializable {
public int CustID;
public int CustOrderID;
public Object OrderDate;
public InnerCustOrdObject[] innerCustOrdObj;
public float GrandTotal;
public int MaxItems;
public CustOrdObject() {}
public CustOrdObject(InnerCustOrdObject[] innerCustOrdObj,
int CustID, int CustOrderID, Object OrderDate,
float GrandTotal, int innerarrlength, int innerarrpos, int MaxItems) {
this.CustID = CustID;
this.CustOrderID = CustOrderID;
this.OrderDate = OrderDate;
this.GrandTotal = GrandTotal;
this.MaxItems = MaxItems;
this.innerCustOrdObj = new InnerCustOrdObject[MaxItems];
public InnerCustOrdObject[] getInnerCustOrdObj() {
return innerCustOrdObj;
public void setInnerCustOrdObj(InnerCustOrdObject[] innerCustOrdObj) {
this.innerCustOrdObj = innerCustOrdObj;
public int getCustID() {
return CustID;
public void setCustID(int custID) {
CustID = custID;
public int getCustOrderID() {
return CustOrderID;
public void setCustOrderID(int custOrderID) {
CustOrderID = custOrderID;
public Object getOrderDate() {
return OrderDate;
public void setOrderDate(Object orderDate) {
OrderDate = orderDate;
public void setGrandTotal(float grandTotal) {
GrandTotal = grandTotal;
public float getGrandTotal() {
return GrandTotal;
public int getMaxItems() {
return MaxItems;
public void setMaxItems(int maxItems) {
MaxItems = maxItems;
public class InnerCustOrdObject implements Serializable{
public int ItemNumber;
public float UnitPrice;
public int QuantityRequired;
public float TotalPrice;
public InnerCustOrdObject() {}
public InnerCustOrdObject(int ItemNumber, float
UnitPrice, int QuantityRequired, float TotalPrice){
this.ItemNumber = ItemNumber;
this.UnitPrice = UnitPrice;
this.QuantityRequired = QuantityRequired;
this.TotalPrice = TotalPrice;
public int getItemNumber() {
return ItemNumber;
public void setItemNumber(int itemNumber) {
ItemNumber = itemNumber;
public int getQuantityRequired() {
return QuantityRequired;
public void setQuantityRequired(int quantityRequired) {
QuantityRequired = quantityRequired;
public float getTotalPrice() {
return TotalPrice;
public void setTotalPrice(float totalPrice) {
TotalPrice = totalPrice;
public float getUnitPrice() {
return UnitPrice;
public void setUnitPrice(float unitPrice) {
UnitPrice = unitPrice;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class CustomerOrderDetails extends CommonFeatures{
//TODO
private static int MAX_ORDERS = 200;
private static int MAX_ORDERITEMS = 100;
private static int MaxRecord;
private static int CurrentRecord = 1;
private static int currentItem;
private static int MaxItems;
private static boolean FileExists, recFileExists;
private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
private static File OrderDetailsFile = new File("CustOrdDetails.dat");
private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
private static PrintWriter writeFile;
private static BufferedReader readFile;
private static ObjectOutputStream objOut;
private static ObjectInputStream objIn;
//Set format for date
SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
//--<BEGINNING>--Declaring Interface Variables------------------------------------------//
private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
//--<END>--Declaring Interface Variables------------------------------------------------//
public static void main(String[] args) {
final CustomerOrderDetails COD = new CustomerOrderDetails();
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
COD.createCustOrdDetailsScreen();
} catch (Exception eb) {
eb.printStackTrace();
//--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
public JFrame createCustOrdDetailsScreen() {
createDefaultFrame();
mainframe.setSize(800,500);
createContainerPanel();
containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
//containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
//containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
mainframe.setContentPane(containerpanel);
mainframe.setLocationRelativeTo(null);
mainframe.setVisible(true);
//--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
if (OrdRecordNumStore.exists() == true) {
recFileExists = true;
}else {
recFileExists = false;
if (recFileExists == true) {
MaxRecord = readRecordNumber();
CurrentRecord = MaxRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
}else{
MaxRecord = 1;
writeRecordNumber(MaxRecord);
CustOrderIDTxt.setText(""+MaxRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
//--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
if(readOrder() != null){
orderDetails = (CustOrdObject[]) readOrder();
innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
MaxItems = orderDetails[CurrentRecord].getMaxItems();
if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
externalnextbtn.setEnabled(true);
externalprevbtn.setEnabled(true);
if(CurrentRecord >= MaxRecord){
externalnextbtn.setEnabled(false);
getFieldText(CurrentRecord-1);
}else{
orderDetails[CurrentRecord] = new CustOrdObject();
currentItem = 1;
return mainframe;
//--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
public JPanel createCustOrdDetailsTitle(){
createTitlePanel();
titlepanel.setBackground(TxtfontColor);
label.setText("- Customer Order Details -");
labelpanel.setBackground(TxtfontColor);
label.setForeground(Color.white);
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor) ;
buttonpanel.add(createReturnToMainMenuButton());
titlepanel.add(labelpanel, BorderLayout.WEST);
titlepanel.add(buttonpanel, BorderLayout.EAST);
return titlepanel;
public JPanel createCustOrdDetailsMainPanel(){
createmainpanel();
mainpanel.setBackground(TxtfontColor);
mainpanel.setLayout(new BorderLayout());
mainpanel.setBorder(BorderFactory.createTitledBorder(""));
mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
return mainpanel;
public JPanel createInnerTopPanel(){
innertoppanel = new JPanel(new GridBagLayout());
innertoppanel.setBackground(TxtfontColor);
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
CustIDLbl = new JLabel("Customer ID");
CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustIDLbl.setFont(font);
CustIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innertoppanel.add(CustIDLbl, GBC);
CustIDTxt = new JTextField(20);
CustIDTxt.setEditable(true);
GBC.gridx = 2;
GBC.gridy = 1;
innertoppanel.add(CustIDTxt, GBC);
GBC.gridx = 3;
GBC.gridy = 1;
innertoppanel.add(Box.createHorizontalStrut(220), GBC);
OrderedDateLbl = new JLabel("Order Date");
OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
OrderedDateLbl.setFont(font);
OrderedDateLbl.setForeground(LblfontColor);
GBC.gridx = 4;
GBC.gridy = 1;
innertoppanel.add(OrderedDateLbl, GBC);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
OrderedDateTxt.setEditable(false);
GBC.gridx = 5;
GBC.gridy = 1;
innertoppanel.add(OrderedDateTxt, GBC);
CustOrderIDLbl = new JLabel("Customer Order ID");
CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustOrderIDLbl.setFont(font);
CustOrderIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDLbl, GBC);
CustOrderIDTxt = new JTextField(20);
CustOrderIDTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDTxt, GBC);
return innertoppanel;
public JPanel createInnerCenterPanel(){
innercenterpanel = new JPanel(new GridBagLayout());
innercenterpanel.setBackground(TxtfontColor);
innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
ItemNumberLbl = new JLabel("Item Number");
ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
ItemNumberLbl.setFont(font);
ItemNumberLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberLbl, GBC);
ItemNumberTxt = new JTextField(20);
GBC.gridx = 2;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberTxt, GBC);
UnitPriceLbl = new JLabel("Unit Price");
UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
UnitPriceLbl.setFont(font);
UnitPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceLbl, GBC);
UnitPriceTxt = new JTextField(20);
//UnitPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceTxt, GBC);
QuantityReqLbl = new JLabel("Quantity Required");
QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
QuantityReqLbl.setFont(font);
QuantityReqLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqLbl, GBC);
QuantityReqTxt = new JTextField(20);
//QuantityReqTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqTxt, GBC);
TotPriceLbl = new JLabel("Total Price");
TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
TotPriceLbl.setFont(font);
TotPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 4;
innercenterpanel.add(TotPriceLbl, GBC);
TotPriceTxt = new JTextField(20);
//TotPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 4;
innercenterpanel.add(TotPriceTxt, GBC);
return innercenterpanel;
public JPanel createInnerBottomPanel(){
innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
innerbottompanel.setBackground(TxtfontColor);
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
GrandTotLbl = new JLabel("Grand Total");
GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GrandTotLbl.setFont(font);
GrandTotLbl.setForeground(LblfontColor);
innerbottompanel.add(GrandTotLbl);
innerbottompanel.add(Box.createHorizontalStrut(30));
GrandTotTxt = new JTextField(20);
innerbottompanel.add(GrandTotTxt);
return innerbottompanel;
public JPanel createInnerRightPanel(){
innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerrightpanel.setBackground(TxtfontColor);
innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerrightpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalnextbtn = new JButton(createNextButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
//getInnerFieldText(currentItem);
internalprevbtn.setEnabled(true);
if(currentItem < MaxItems){
++CurrentRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
setInnerFieldText(currentItem);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(currentItem == MaxItems){
internalnextbtn.setEnabled(false);
innerrightpanel.add(internalnextbtn, GBC);
return innerrightpanel;
public JPanel createInnerLeftPanel(){
innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerleftpanel.setBackground(TxtfontColor);
innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerleftpanel.setForeground(Color.BLACK);
innerleftpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalprevbtn = new JButton(createPreviousButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
//getInnerFieldText(currentItem);
internalnextbtn.setEnabled(true);
if(currentItem == 1){
internalprevbtn.setEnabled(false);
if(currentItem > 0){
--currentItem;
//readOrder();
setInnerFieldText(currentItem);
innerleftpanel.add(internalprevbtn, GBC);
return innerleftpanel;
public JPanel createCustOrdDetailsButtons(){
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor);
externalprevbtn = new JButton(createPreviousButtonIcon());
externalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalnextbtn.setEnabled(true);
if(CurrentRecord == 1){
externalprevbtn.setEnabled(false);
if(CurrentRecord > 0){
--CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
buttonpanel.add(externalprevbtn);
addrecordbtn = new JButton("Add Record", createAddButtonIcon());
addrecordbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
MaxRecord = readRecordNumber();
MaxRecord++;
writeRecordNumber(MaxRecord);
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
CustIDTxt.setText("");
CustOrderIDTxt.setText(""+MaxRecord);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt.setText(""+simpleDF.format(todaydate));
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
GrandTotTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
externalnextbtn.setEnabled(false);
externalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(addrecordbtn);
savebtn = new JButton("Save Data", createSaveButtonIcon());
savebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
setFieldText(CurrentRecord);
writeOrder();
writeRecordNumber(MaxRecord);
System.out.println(CurrentRecord);
System.out.println(MaxRecord);
buttonpanel.add(savebtn);
java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
additemreqbtn = new JButton("Add Item", AddRowIcon);
additemreqbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
//CurrentRecord = MaxRecord;
currentItem++;
setInnerFieldText(currentItem);
internalnextbtn.setEnabled(false);
internalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(additemreqbtn);
externalnextbtn = new JButton(createNextButtonIcon());
externalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalprevbtn.setEnabled(true);
if(CurrentRecord < MaxRecord){
++CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(CurrentRecord == MaxRecord){
externalnextbtn.setEnabled(false);
buttonpanel.add(externalnextbtn);
return buttonpanel;
//TODO
public void setFieldText(int orderID){//TODO
orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
orderDetails[orderID].setMaxItems(MaxItems);
setInnerFieldText(currentItem);
orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
public void setInnerFieldText(int currentItem){//TODO
innerCustOrdObj[currentItem] = new InnerCustOrdObject();
innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
public void getFieldText(int orderID){
CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
currentItem = orderDetails[orderID].getMaxItems();
System.err.println("currentItem" + currentItem);
getInnerFieldText(currentItem);
GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
public void getInnerFieldText(int currentItem){
ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
public void writeOrder(){//TODO
try {
objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
objOut.writeObject(orderDetails);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
} catch (IOException e) {
e.printStackTrace();
public Object readOrder(){
Object temporaryObj;
try{
objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
temporaryObj = objIn.readObject();
CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
System.out.println("Outer: "+blah[1].getCustID());
InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
System.out.println("Inner: "+whee[1].getItemNumber());
objIn.close();
System.out.println("Read Worky!");
return temporaryObj;
}catch(Exception e){
e.printStackTrace();
System.out.println("Read No Worky!");
return null;
public void writeRecordNumber(int MaxRecord){
try{
objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
objOut.writeObject(MaxRecord);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
}catch(Exception e){e.printStackTrace();}
public int readRecordNumber() {
try {
objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
int temporaryObj = Integer.parseInt(objIn.readObject().toString());
objIn.close();
System.out.println("Read Number Worky!");
return temporaryObj;
} catch (Exception e) {
e.printStackTrace();
System.out.println("Read Number No Worky!");
return -1;
}Message was edited by:
Kilik07
Message was edited by:
Kilik07ok i got reading to work to a certain extent... but the prob is i cnt seem to save my innerCustOrdObj proprly...when ever i look for a record using the gotorecordbtn, the outerobject, which is the orderDetails, seems to change but the innerCustOrdObj remains the same... heres the new code..
public class CustomerOrderDetails extends CommonFeatures{
//TODO
private static int MAX_ORDERS = 200;
private static int MAX_ORDERITEMS = 100;
private static int MaxRecord;
private static int CurrentRecord = 1;
private static int currentItem;
private static int MaxItems = 1;
private static boolean FileExists, recFileExists;
private static boolean RecordExists;
private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
private static File OrderDetailsFile = new File("CustOrdDetails.ser");
private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
private static PrintWriter writeFile;
private static BufferedReader readFile;
private static ObjectOutputStream objOut;
private static ObjectInputStream objIn;
//Set format for date
SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
//--<BEGINNING>--Declaring Interface Variables------------------------------------------//
private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
//--<END>--Declaring Interface Variables------------------------------------------------//
public static void main(String[] args) {
final CustomerOrderDetails COD = new CustomerOrderDetails();
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
COD.createCustOrdDetailsScreen();
} catch (Exception eb) {
eb.printStackTrace();
//--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
public JFrame createCustOrdDetailsScreen() {
createDefaultFrame();
mainframe.setSize(800,500);
createContainerPanel();
containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
//containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
//containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
mainframe.setContentPane(containerpanel);
mainframe.setLocationRelativeTo(null);
mainframe.setVisible(true);
//--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
if (OrdRecordNumStore.exists() == true) {
recFileExists = true;
}else {
recFileExists = false;
if (recFileExists == true) {
MaxRecord = readRecordNumber();
CurrentRecord = MaxRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
}else{
MaxRecord = 1;
writeRecordNumber(MaxRecord);
CustOrderIDTxt.setText(""+MaxRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
//--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
if(readOrder() != null){
orderDetails = (CustOrdObject[]) readOrder();
//CurrentRecord--;
//System.out.println("Current Rec Here"+CurrentRecord);
if(orderDetails[CurrentRecord] == null){
System.err.println("CustomerOrderObj 1 is null !!");
}else{
System.err.println("CustomerOrderObj 1 is not null !!");
if(orderDetails[CurrentRecord].getInnerCustOrdObj() == null){
System.err.println("InnerCustomerOrderObj is null !!");
}else{
System.err.println("InnerCustomerOrderObj is not null !!");
innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
MaxItems = orderDetails[CurrentRecord].getMaxItems();
if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
externalnextbtn.setEnabled(true);
externalprevbtn.setEnabled(true);
if(CurrentRecord >= MaxRecord){
externalnextbtn.setEnabled(false);
getFieldText(CurrentRecord);
getInnerFieldText(MaxItems);
}else{
orderDetails[CurrentRecord] = new CustOrdObject();
currentItem = 1;
return mainframe;
//--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
public JPanel createCustOrdDetailsTitle(){
createTitlePanel();
titlepanel.setBackground(TxtfontColor);
label.setText("- Customer Order Details -");
labelpanel.setBackground(TxtfontColor);
label.setForeground(Color.white);
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor) ;
buttonpanel.add(createReturnToMainMenuButton());
titlepanel.add(labelpanel, BorderLayout.WEST);
titlepanel.add(buttonpanel, BorderLayout.EAST);
return titlepanel;
public JPanel createCustOrdDetailsMainPanel(){
createmainpanel();
mainpanel.setBackground(TxtfontColor);
mainpanel.setLayout(new BorderLayout());
mainpanel.setBorder(BorderFactory.createTitledBorder(""));
mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
return mainpanel;
public JPanel createInnerTopPanel(){
innertoppanel = new JPanel(new GridBagLayout());
innertoppanel.setBackground(TxtfontColor);
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
CustIDLbl = new JLabel("Customer ID");
CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustIDLbl.setFont(font);
CustIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innertoppanel.add(CustIDLbl, GBC);
CustIDTxt = new JTextField(20);
CustIDTxt.setEditable(true);
GBC.gridx = 2;
GBC.gridy = 1;
innertoppanel.add(CustIDTxt, GBC);
GBC.gridx = 3;
GBC.gridy = 1;
innertoppanel.add(Box.createHorizontalStrut(220), GBC);
OrderedDateLbl = new JLabel("Order Date");
OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
OrderedDateLbl.setFont(font);
OrderedDateLbl.setForeground(LblfontColor);
GBC.gridx = 4;
GBC.gridy = 1;
innertoppanel.add(OrderedDateLbl, GBC);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
OrderedDateTxt.setEditable(false);
GBC.gridx = 5;
GBC.gridy = 1;
innertoppanel.add(OrderedDateTxt, GBC);
CustOrderIDLbl = new JLabel("Customer Order ID");
CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustOrderIDLbl.setFont(font);
CustOrderIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDLbl, GBC);
CustOrderIDTxt = new JTextField(20);
//CustOrderIDTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDTxt, GBC);
return innertoppanel;
public JPanel createInnerCenterPanel(){
innercenterpanel = new JPanel(new GridBagLayout());
innercenterpanel.setBackground(TxtfontColor);
innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
ItemNumberLbl = new JLabel("Item Number");
ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
ItemNumberLbl.setFont(font);
ItemNumberLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberLbl, GBC);
ItemNumberTxt = new JTextField(20);
GBC.gridx = 2;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberTxt, GBC);
UnitPriceLbl = new JLabel("Unit Price");
UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
UnitPriceLbl.setFont(font);
UnitPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceLbl, GBC);
UnitPriceTxt = new JTextField(20);
//UnitPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceTxt, GBC);
QuantityReqLbl = new JLabel("Quantity Required");
QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
QuantityReqLbl.setFont(font);
QuantityReqLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqLbl, GBC);
QuantityReqTxt = new JTextField(20);
//QuantityReqTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqTxt, GBC);
TotPriceLbl = new JLabel("Total Price");
TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
TotPriceLbl.setFont(font);
TotPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 4;
innercenterpanel.add(TotPriceLbl, GBC);
TotPriceTxt = new JTextField(20);
TotPriceTxt.setEditable(false);
TotPriceTxt.addFocusListener(new FocusAdapter(){
public void focusGained(FocusEvent evt){
TotPriceTxt.setText(""+Integer.parseInt(UnitPriceTxt.getText())*Integer.parseInt(QuantityReqTxt.getText()));
GBC.gridx = 2;
GBC.gridy = 4;
innercenterpanel.add(TotPriceTxt, GBC);
return innercenterpanel;
public JPanel createInnerBottomPanel(){
innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
innerbottompanel.setBackground(TxtfontColor);
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
GrandTotLbl = new JLabel("Grand Total");
GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GrandTotLbl.setFont(font);
GrandTotLbl.setForeground(LblfontColor);
innerbottompanel.add(GrandTotLbl);
innerbottompanel.add(Box.createHorizontalStrut(30));
GrandTotTxt = new JTextField(20);
innerbottompanel.add(GrandTotTxt);
return innerbottompanel;
public JPanel createInnerRightPanel(){
innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerrightpanel.setBackground(TxtfontColor);
innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerrightpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalnextbtn = new JButton(createNextButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getInnerFieldText(currentItem);
internalprevbtn.setEnabled(true);
if(currentItem < MaxItems){
++currentItem;
orderDetails[CurrentRecord].getInnerCustOrdObj();
setInnerFieldText(currentItem);
System.out.println("Current Item" + currentItem);
if(currentItem == MaxItems){
internalnextbtn.setEnabled(false);
innerrightpanel.add(internalnextbtn, GBC);
return innerrightpanel;
public JPanel createInnerLeftPanel(){
innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerleftpanel.setBackground(TxtfontColor);
innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerleftpanel.setForeground(Color.BLACK);
innerleftpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalprevbtn = new JButton(createPreviousButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getInnerFieldText(currentItem);
internalnextbtn.setEnabled(true);
if(currentItem == 1){
internalprevbtn.setEnabled(false);
if(currentItem > 0){
--currentItem;
orderDetails[CurrentRecord].getInnerCustOrdObj();
setInnerFieldText(currentItem);
System.out.println("Current Item" + currentItem);
innerleftpanel.add(internalprevbtn, GBC);
return innerleftpanel;
public JPanel createCustOrdDetailsButtons(){
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor);
externalprevbtn = new JButton(createPreviousButtonIcon());
externalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalnextbtn.setEnabled(true);
if(CurrentRecord == 1){
externalprevbtn.setEnabled(false);
if(CurrentRecord > 0){
--CurrentRecord;
setFieldText(CurrentRecord);
System.out.println("Current Record " + CurrentRecord);//Checking RECORD_NUM
buttonpanel.add(externalprevbtn);
addrecordbtn = new JButton("Add Record", createAddButtonIcon());
addrecordbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
MaxRecord = readRecordNumber();
MaxRecord++;
CurrentRecord = MaxRecord;
orderDetails[CurrentRecord] = new CustOrdObject();
writeRecordNumber(MaxRecord);
MaxItems = 1;
innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
CustIDTxt.setText("");
CustOrderIDTxt.setText(""+MaxRecord);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt.setText(""+simpleDF.format(todaydate));
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
GrandTotTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
externalnextbtn.setEnabled(false);
externalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(addrecordbtn);
savebtn = new JButton("Save Data", createSaveButtonIcon());
savebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
setFieldText(CurrentRecord);
setInnerFieldText(MaxItems);
writeOrder();
writeRecordNumber(MaxRecord);
System.out.println(CurrentRecord);
System.out.println(MaxRecord);
buttonpanel.add(savebtn);
java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
additemreqbtn = new JButton("Add Item", AddRowIcon);
additemreqbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
//CurrentRecord = MaxRecord;
MaxItems++;
innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
System.out.println("Max Items "+MaxItems);
currentItem = MaxItems;
orderDetails[CurrentRecord].setMaxItems(MaxItems);
///setInnerFieldText(currentItem);
internalnextbtn.setEnabled(false);
internalprevbtn.setEnabled(true);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(additemreqbtn);
externalnextbtn = new JButton(createNextButtonIcon());
externalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalprevbtn.setEnabled(true);
if(CurrentRecord < MaxRecord){
++CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(CurrentRecord == MaxRecord){
externalnextbtn.setEnabled(false);
buttonpanel.add(externalnextbtn);
gotorecordbtn = new JButton("Go To Record", createGotoButtonIcon());
gotorecordbtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt){
* The text from the GotorecordTxt textfield will be taken and assigned
* to a temporary integer variable called Find.
int Find = Integer.parseInt(CustOrderIDTxt.getText());
for(int j=1; j <= MaxRecord; j++){
* Using a for loop, each record can be read using the readCustRecord
* method.
getFieldText(j);
* An if condition is utilized to check whether the temporary stored variable, Find,
* matches a field in a record. If this record is found, then using the RecordExists
* which was declared at the top, either a true or false statement can be assigned
* If the record exists, then a true statement will be assigned, if not a false
* statement will be assigned.
if(orderDetails[j].getCustOrderID() == Find){
RecordExists = true;
break;
}else{
RecordExists = false;
if(RecordExists == false){
* If the RecordExists is assigned a false statement, then a message will be
* displayed to show that the record does not exist.
JOptionPane.showMessageDialog(null, "Record Does Not Exist!", "Error Message", JOptionPane.ERROR_MESSAGE, createErrorIcon());
}else{
getFieldText(Find);
buttonpanel.add(gotorecordbtn);
return buttonpanel;
//TODO
public void setFieldText(int orderID){//TODO
orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
orderDetails[orderID].setMaxItems(MaxItems);
setInnerFieldText(currentItem);
orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
public void setInnerFieldText(int currentItem){//TODO
innerCustOrdObj[currentItem] = new InnerCustOrdObject();
innerCustOrdObj[currentItem].setMaxItems(MaxItems);
innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
public void getFieldText(int orderID){
CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
currentItem = orderDetails[orderID].getMaxItems();
orderDetails[orderID].getInnerCustOrdObj();
System.err.println("currentItem" + currentItem);
//getInnerFieldText(currentItem);
GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
public void getInnerFieldText(int currentItem){
ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
public void writeOrder(){//TODO
try {
objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
objOut.writeObject(orderDetails);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
} catch (IOException e) {
e.printStackTrace();
public Object readOrder(){
Object temporaryObj;
try{
objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
temporaryObj = objIn.readObject();
CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
/* System.out.println("Outer: "+blah[1].getCustID());
InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
System.out.println("Inner: "+whee[1].getItemNumber());*/
objIn.close();
System.out.println("Read Worky!");
return temporaryObj;
}catch(Exception e){
e.printStackTrace();
System.out.println("Read No Worky!");
return null;
public void writeRecordNumber(int MaxRecord){
try{
objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
objOut.writeObject(MaxRecord);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
}catch(Exception e){e.printStackTrace();}
public int readRecordNumber() {
try {
objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
int temporaryObj = Integer.parseInt(objIn.readObject().toString());
objIn.close();
System.out.println("Read Number Worky!");
return temporaryObj;
} catch (Exception e) {
e.printStackTrace();
System.out.println("Read Number No Worky!");
return -1;
}Message was edited by:
Kilik07 -
Using a class or servlet that implements Serializable
Hello everyone,
Can someone please help me. I need to make a program that uses a class or servlet that implements Serializable and then use the values of the variables in servlets.
The first is using it to validate login. then changing the color of the background, header and footer of each servlet.
the variables in the Serialized file are all Strings for color, username, password, header text and footer text.
I tried using the applet tag to run the class in the servlet but it is not working.It's not working because you seem to be making random guesses what servlets, serialization and files are
-
Problem with NotSerializableException on class implementing Serializable
Hi,
Any idea as to why I get this exception, and what I can do to avoid it ?
java.io.NotSerializableException: util.NumberStore$UserI have this, relatively simple, class
class User implements Serializable
private static long serialVersionUID = 1L;
private String uid;
private String nr;
public User(){}
public User( String uid, String nr ) {
this.uid = uid;
this.nr = nr;
public String getUid() {
return uid;
public String getNr() {
return nr;
public void setUid(String uid){
this.uid = uid;
public void setNr(String nr){
this.nr = nr;
}When loading and saving it, I use these two methods:
private void saveLocalList()
FileOutputStream f = null;
try {
f = new FileOutputStream("./users.dat");
ObjectOutputStream out = new ObjectOutputStream(f);
for (User u: numbers)
out.writeObject(u);
f.close();
} catch (IOException e) {
System.err.println("User info not saved:"+e.getLocalizedMessage());
if (f != null)
try {
f.close();
} catch (IOException e1) {
private boolean loadLocalList()
FileInputStream f = null;
try {
f = new FileInputStream("./users.dat");
ObjectInputStream input = new ObjectInputStream(f);
numbers = new ArrayList<User>();
User u = (User) input.readObject();
while (u != null)
numbers.add(u);
u = (User) input.readObject();
f.close();
return true;
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
e.printStackTrace();
if (f != null)
try {
f.close();
} catch (IOException e1) {
// ignore close errors
return false;
} catch (ClassNotFoundException e) {
if (f != null)
try {
f.close();
} catch (IOException e1) {
// ignore close errors
return false;
}Both the User class and the methods are found within the NumberStore class.The User class indeed does not contain any references at all to the NumberStore classIf 'User' is nested inside 'NumberStore' and it isn't static, User does indeed have a hidden reference to the outer class NumberStore. That's how the syntax 'NumberStore.this' works.
I can say with absolute certainty that an object which was not marked as serializable was written to the users.dat file.Quite apart from the fact that the source code of ObjectOutputStream makes it utterly impossible, I don't see how you can possibly say that 'with absolute certainty'. For a start there's no information in the file to indicate what interfaces were and weren't implemented by the class of the serialized object at the time it was serialized.
I'm not absolutely positive about whether or not it bombed out on this occassion, or when trying to re-read it next time aroundNotSerializableException is only thrown when writing, not when reading, so that answers that.
Do you still have the file? I'd like to see exactly what was written. In any case a serialization file that copped any kind of IOException when being written should have been thrown away immediately, you're right about that.
BTW your reading code is wrong. You shouldn't be testing for null, unless you are deliberately writing a null as a sentinel value. You should be catching EOFException. -
Example class that implements Serializable interface
Dear,
I have a class myData that I want to implement Serializable interface. class myData has only two fields: Integer iData1, String sData2.
Could anybody shown me how my myData class should be?
Thanks a lot!Hey, if you have yet to obtain a remote reference from the app server ...then we are into pandora's box. I lost three whole heads of hair getting up on JBoss when I first started. You want to check out the JBoss forums on the JBoss website, and the enterprise javabeans forum here. Search some posts and read the free JBoss manual.
Unfortunately, there isn't a 'here, do this' solution to getting connected with JBoss. There are quite a few gotcha's. There are descriptors, descriptor syntax ...and this changes between releases so there seems to be alot of people saying 'here, do this' ...but you try and it doesn't work (wrong release). Here are some descriptors that I threw up recently for someone ...a place to start.
http://forum.java.sun.com/thread.jsp?forum=13&thread=414432
This drove me nuts until it all worked right. I was stuck for three weeks at one point ...ready to give up, but then I got it. Perservere ...its a nice container for learning in (its free!).
I will try and watch for you.
Oh, and put something in your head ...at least then you will keep your hair !
:) -
If I remove "implements serializable" XMLEncoder/decoder still works ???
Like the title says, if I remove "implements serializable" from the class declaration, I can still write out the file to XML. Why?
Also, I'm using hungarian notation instead of following the normal javabean naming convention. Shouldn't this break the XMLEncoding/decoding process ??
For example, in my class I have a few variables:
private int iAge = 1;
private String szName = "John Smith";
public void setAge( int iNewAge ) {
iAge = iNewAge;
public void setName( String szNewName ) {
szName = szNewName;
}When it's written to XML, it uses "name" instead of "szName". How does it know that setName refers to the variable szName (instead of some variable called "name" which does not exist?
<void property="name">
<string>Name here</string>
</void>ThanksWhen it's written to XML, it uses "name" instead of
"szName". How does it know that setName refers to
o the variable szName (instead of some variable
called "name" which does not exist?It doesn't know anything about the variable. JavaBeans will, by default, look at getter and setter methods. Since you have setName and setAge, and no BeanInfo (I think that's the name) class to say otherwise, the result is that in JavaBeans world, you have a name and an age property, and they're accessed through those methods. -
My class is serializing w/o implementing serializable
I have a class Foo that implements Serializable.
Foo has a data member that is an instance of class Bar.
Class Bar does NOT implement Serializable.
When I serialize an instance of Foo out to a file and
then deserialize it back in, I'm seeing Bar's no-arg
constructor being called.
Shouldn't I be getting IOExceptions on the write and
and read of my Foo instance when the JVM tries to
write/read the Bar member, since only classes that implement
Serializable can be serialized/deserialized?
Oh, I'm using JDK 2SDK version 1.3.1
-SteveFrom the Serializable API
"To allow subtypes of non-serializable classes to be serialized, the subtype may assume responsibility for saving and restoring the state of the supertype's public, protected, and (if accessible) package fields. The subtype may assume this responsibility only if the class it extends has an accessible no-arg constructor to initialize the class's state. It is an error to declare a class Serializable in this case. The error will be detected at runtime."
There seems to be a mistake in the second to last sentence. I would think itr should say 'It is an error to declare a class Serializable if this is not the case'. -
How ServletContext and Session object differ in a Serlet
Both ServletContext and Session allows storing objects as a name value pair set and they can be accessed across several servlets/JSP's. How do they differ?
Hi
The Main difference is their visibility or rather the scope of the varibles differs depending on whether they are stored in the session or the Servlet Context.
When you say that an Object is stored in the session then it means that the Object is available to the application for duration of the particulars user's session i.e. as long as the user's session is active the Object is available though not for others who will have a different session and so will not be able to access this information.
Whereas, when you add the Object to Servlet Context you are setting up the object to be visible throughout the application for duration of the application itself and for any component that is art of the application
So if we have a list of Object storage/sharing mechanisms listed in descending order of object life span/visibility then we have:
Application - ServletContext
Session - HttpSession
Request - ServletRequest
Page
Keep me posted on your progress.
Good Luck!
Eshwar Rao
Developer Technical Support
Sun microsystems
http://www.sun.com/developers/support -
Why we require to implement Serializable interface?
Hi techies,
I am new to Serialization. Why we require to use Serializable interface for Serializing objects. Since Serializable interface is a marker interface, how it prevents objects not implementing Serializable from being Serialized. Does Java Compiler checks it or how it checks it?JavaBreather wrote:
Since Serializable interface is a marker interface, how it prevents objects not implementing Serializable from being >Serialized. Does Java Compiler checks it or how it checks it?Compiler does nothing but mark the class as implementing the interface. You can then later check whether objects instanceof Interface" and find out whether or not it is present. As said above, ObjectOutputStream does the same thing.
Marker interfaces are a misuse of interfaces, and should be avoided. You shouldn't create new ones.Annotations introduce in Java 5 are a generic mechanism of adding metadata to a class. -
PL/SQL and Java implementation
Hi all,
We need to implement a fast solution for reporting to our existing web application. Application is totally based on stored procedures written in PL/SQL.
We have already java classes for drawing different types of charts
named Chartdirector (http://www.advsofteng.com/)
This library can create chart images in memory.
I have already read about calling java classes from PL/SQL and SQLJ too.
My questions are;
1. Is this safe to include classes to database and create
reports by using loadjava in real life. I mean not in theory, in real life?
2. Is there any experiments of the audience about this method?
3. Would it be any performance problems about this?
4. Should i prefer to use any Java container and jsps instead of this method?
I will continue to research for necessary steps after i could see the light :)
Thank you to all,
Regards,
Gokhan> 1. Is this safe to include classes to database and create
reports by using loadjava in real life. I mean not in theory, in real life?
Yes.
> 2. Is there any experiments of the audience about this method?
Experiments and actual implementation - yes. It works. Granted, it does not always work as easy as running the Java code from the command line. But it does work.
> 3. Would it be any performance problems about this?
This is a potential problem with any software code.
4. Should i prefer to use any Java container and jsps instead of this method?
To be honest, I prefer not using Java for web graphics as I'm not impressed with the quality and flexibility of the graphs generated. I prefer using (and paying for commercial use) for the JPGraph classes for PHP - and using that from PL/SQL (via Zend Core for Oracle).
Another option is to use SVG and generated SVG directly from PL/SQL. But this requires a browser plugin and SVG also does not look that great. (this is btw what Oracle's HTMLDB does and uses) -
Problem with HttpURLConnection and HttpSession.
Hi,
Problem with HttpURLConnection and HttpSession.
I created a HttpSession object in my main class and then called a URL via HttpURLConnection.
I tried to access the same session object from the servlet called by the URL . but the main session
is not returned a new seperate session is created.let me know how can we continue the same session in
the called URL also which is created in main class.
Thanks
PrasadYou are not supported to create a HttpSession by java client. Only J2EE web container can create it.
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Differences between US and UK implementations for HR and Benefits
Need to know any information about implementing Oracle HR and basic benefits in Europe (France localization with rollup of others). I have HR, OAB implementation experinece in US. Want to understand the differences between US implementations and UK implementations. Any reference documents welcome.
Thanks
AluAlu,
Here are some starting points, but the list is only a subset of published collateral:
1. MetaLink Note 315928.1 - HRMS for France - Public Sector Updates FP K - June 2005
2. MetaLink Note 315927.1 - HRMS for France - Commercial Sector Updates FP K - June 2005
3. MetaLink Note 273558.1 - P11D Implementation and User Guide 2005-2006
4. MetaLink Note 356684.1 - UK: Payroll Statutory Deductions User Guide incorporating End of Year and Start of Year 2005-2006
5. MetaLink Note 236455.1 - Teacher''s Pension Extracts in Oracle HRMS
6. MetaLink Note 236454.1 - Occupational Sick Pay and Occupational Maternity Pay in Oracle HRMS
7. Oracle HRMS Implementation Guide B14466-01
8. Oracle HRMS Implementation Guide (UK) B15575-01
9. Oracle HRMS Implementation Guide (US) B15548-01
10. Oracle HRMS Enterprise and Workforce Management Guide (Global) B14467-01
11. Oracle HRMS Compensation and Benefits Management Guide (UK) B15579-01
Regards,
Greg -
Which table if for BADI and its implementation
Which table if for BADI and its implementation
I want to know which implementations have already been created and actived for one BADI.Hi
check the tables for BADI
SXC_ATTR
SXC_ATTRT
SXC_CLASS
SXC_COCO
SXC_EXIT
SXC_FCODE
SXC_FCODET
SXC_IMPSWH
SXC_SCRN
SXC_TABLE
SXC_TABLET
Regards
Anji -
Need information abt ServletContext and ServletConfig
i want to know the information and difference b/w in ServletContext and ServletConfig pls help me.
Thanks&Regards
kishoreServletConfig serves a very specific purpose, a means to get configuration parameters from the web.xml INTO you servlet. AFAIK, it doesn't serve much purpose beyond that...
ServletContext provides the mechanism for a Servlet to communication with the Container. You can get path information, use it to store application wide attributes and parameters, etc.
The two really have absolutely nothing in common. So to answer your rather vague question:
"The difference b/w ServletContext and ServletConfig: Everything."
Do you have a more specific question? Is there a particular thing (like maybe the fact they both have methods named getInitParameter and getInitParmaterNames....) that is confusing you? -
Performanceproblem with WL6.1 JDBC and Oracle
Hi!
I have a big performance-problem using wl6.1, jdbc and oracle.
My Server is sending a Vector with NodeBeans via JDBC to a OracleDB. The answer
comes immediately with the timeout.
Why is the EJB waiting for the timeout?
Is it a problem of configuration?
Thanks
ThomasHi Sree,
here I send You the class with the main problem. The call queryDataSet.refresh();
is the timeconsuming part.
We are using WL6.1sp2, Oracle 8.1.7 with classes12. In our environment we can
not use connectionpools.
It comes back with a timeout AND the data. Calling it again immediately it takes
2/3 of the time the timeout is set.
Do You have a fine solution?
Thanks
Thomas
package ppif.db;
import java.rmi.*;
import ppif.bo.*;
import java.util.*;
import com.borland.dx.dataset.*;
import com.borland.dx.sql.dataset.*;
import java.math.*;
public class connector {
private ppif.mapping.NodeDescriptions nodeDescriptions;
public connector(ppif.mapping.NodeDescriptions nodeDescriptions) {
this.nodeDescriptions = nodeDescriptions;
public connector() {
this.nodeDescriptions = nodeDescriptions;
public Vector fetchNodes(ppif.bo.Node filterNode) throws RemoteException {
String childClassName = null;
Vector nodeVector = new Vector();
Node node = null;
if (nodeDescriptions == null) throw new RemoteException("nodeDescriptions ==
null");
// childClassName zu gegebenen filterNode ermitteln
if (filterNode.getClassName().equals("DefaultRoot")) childClassName = "ST";
if (filterNode.getClassName().equals("PrismaProjectsRoot")) childClassName =
"PrismaProjects";
if (childClassName == null) throw new RemoteException("Zum übergebenen filterNode
wurde kein chlidClassName gefunden.");
if (nodeDescriptions.getNodeDescription(childClassName) == null) throw new RemoteException("Für
die ChildClass "+childClassName+" ist kein Mapping definiert.");
// Vector mit Child-Knoten erzeugen durch DB-Zugriff
ppif.mapping.NodeDescription nodeDescription = nodeDescriptions.getNodeDescription(childClassName);
Database database = new Database();
ParameterRow parameterRow = null;
Column column = null;
QueryDataSet queryDataSet = new QueryDataSet();
// DB-Connect generieren
database.setConnection(new com.borland.dx.sql.dataset.ConnectionDescriptor(nodeDescription.dbUrl,
nodeDescription.dbUser, nodeDescription.dbPassword, false, "oracle.jdbc.driver.OracleDriver"));
int queryCount = 0;
// Schleife über alle queries der childKlasse, gemäss Mapping
for (Iterator it = nodeDescription.mappingQueries.iterator(); it.hasNext();
ppif.mapping.MappingQuery mappingQuery = (ppif.mapping.MappingQuery)it.next();
String queryString = mappingQuery.getQueryString();
parameterRow = mappingQuery.getParameterRow();
// ParameterRow mit Input-Werten füllen
for (int i=0; i<parameterRow.getColumnCount(); i++) {
String columnName = parameterRow.getColumn(i).getColumnName();
String filterAttributeName = columnName;
Object filterAttributeValue = filterNode.getAttribute(filterAttributeName).getVal1();
switch (parameterRow.getColumn(i).getDataType()) {
case com.borland.dx.dataset.Variant.BIGDECIMAL:
BigDecimal val = (BigDecimal)filterAttributeValue;
parameterRow.setBigDecimal(i, val);
break;
case com.borland.dx.dataset.Variant.STRING:
parameterRow.setString(i, (String)filterAttributeValue);
break;
default:
throw new RemoteException("Unbekannter Datentyp");
// Query generieren
queryDataSet.setQuery(new com.borland.dx.sql.dataset.QueryDescriptor(database,
queryString, parameterRow, false, Load.ALL));
// DB-Verbindung öffnen
queryDataSet.open();
// Rolle setzen
if (nodeDescription.dbRole != null) {
java.sql.Statement setRole;
String roleName = nodeDescription.dbRole;
String rolePwd = nodeDescription.dbRolePassword;
try {
java.sql.Connection jdbcConnection = database.getJdbcConnection();
setRole = jdbcConnection.createStatement();
setRole.execute("SET ROLE " + roleName + " IDENTIFIED BY " + rolePwd);
} catch (java.sql.SQLException exception) {
throw new RemoteException(exception.getMessage());
} catch (Exception exception) {
throw new RemoteException(exception.getMessage());
// Query ausführen
queryDataSet.refresh();
// Datensätze in Node-Objekte umwandeln
int columnCount = queryDataSet.getColumnCount();
String columnArray[];
columnArray = queryDataSet.getColumnNames(columnCount);
for(queryDataSet.first(); queryDataSet.inBounds(); queryDataSet.next()) {
Node rNode = nodeDescriptions.createNodeInstance(childClassName);
// Abfrageergebnissen in eine Attributliste übertragen
for (int i=0; i<columnCount; i++) {
nodeVector.add(rNode);
queryCount++;
return nodeVector;
public ppif.mapping.NodeDescriptions getNodeDescriptions() {
return nodeDescriptions;
public void setNodeDescriptions(ppif.mapping.NodeDescriptions nodeDescriptions)
this.nodeDescriptions = nodeDescriptions;
"Sree Bodapati" <[email protected]> wrote:
hi Thomas,
please post more detail on what your code is doing. if possible a code
snippet/error messages/thread dump
sree
"Thomas Eberhard" <[email protected]> wrote in message
news:[email protected]...
Hi!
I have a big performance-problem using wl6.1, jdbc and oracle.
My Server is sending a Vector with NodeBeans via JDBC to a OracleDB.
The
answer
comes immediately with the timeout.
Why is the EJB waiting for the timeout?
Is it a problem of configuration?
Thanks
Thomas
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