Update: If I move the code to be within the mouseclick event (i.e. instead of calling initMarksScreen() I just put the code directly in) it works as expected. So my problem is calling the code in its own method. Does this mean if I want to perform the same steps at another point or on a different button that I have to have the code directly in there instead of in a method I can call?
I am fairly new to Java and trying to create a button that adds a JScrollPane which contains a JTable.
It is called by:
public void mouseClicked(java.awt.event.MouseEvent evt) {
initMarksScreen();
}
The code is:
public final void initMarksScreen() {
String[] columnNames = {"Student ID",
"Last Name",
"Firstname",
"Status",
"Degree",
"Candidate No.",
"Stage",
"Year",
"Code",
"Title",
"Grade Mode",
"Mark",
"Result"};
Object[][] data = {
{"100123456", "Cooper","Sheldon", "Signed Up", "BSc Physics","1201234","1","12","PH1001","Blackholes and Revelations","D",new Integer(99),"P"},
{"100123456", "Cooper","Sheldon", "Signed Up", "BSc Physics","1201234","1","12","PH1025","Astrophysics","D",new Integer(95),"P"}
};
JTable tMarks = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane(tMarks);
tMarks.setFillsViewportHeight(true);
panelCentral.add(scrollPane); --!!ERROR AT THIS LINE!!
panelCentral.revalidate();
}
The panel is declared as:
private static final Container panelCentral = null;
As I'm quite new to Java I imagine there is an easy fix but if I need to add an SSCCE.
Everything displays fine until I click the button then the error I get is:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at GUI.mainScreen.initMarksScreen(mainScreen.java:312)
at GUI.mainScreen$2.mouseClicked(mainScreen.java:183)
at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
if panelCentral is JPanel and its not initialized, initialize before add
panelCentral = new JPanel();
panelCentral.add(scrollPane);
Related
I'm basically building a simple GUI for a simple baking program.
The problem is that after creating a model for JTable, adding a row of data
model.addRow(new String[] {"data", "data","data", "data"});
does not work inside of an actionlistener:
public void actionPerformed(ActionEvent event) {
String buttonText = event.getActionCommand();
if (buttonText.equals("Create Savings Account")) {
createSavingsAccount();
public void createCreditAccount() {
logic.createCreditAccount(pNrField.getText());
model.addRow(new String[] {"data", "data","data", "data"});
}
If I try to create an account I get this message:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at svimag6.GUImain.createSavingsAccount(GUImain.java:145)
at svimag6.GUImain.actionPerformed(GUImain.java:124)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at svimag6.GUImain.createSavingsAccount(GUImain.java:145)
at svimag6.GUImain.actionPerformed(GUImain.java:124)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at svimag6.GUImain.createCreditAccount(GUImain.java:140)
at svimag6.GUImain.actionPerformed(GUImain.java:128)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at svimag6.GUImain.createCreditAccount(GUImain.java:140)
at svimag6.GUImain.actionPerformed(GUImain.java:128)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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)
However, if I hardcode the adding of new rows into the table, (in the constructor) it works. But I can't add data dynamically.
Here's the code:
package gui;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.event.*;
import java.awt.*;
//YOU NEED TO ADD A FIELD in the GUI FOR NAME, LASTNAME AND PNR
public class GUImain extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private BankLogic logic;
private JList<Object> customerList;
private JTable accountTable;
private JTable transactionTable;
private JTextField nameField;
private JTextField lastnameField;
private JTextField pNrField;
private DefaultTableModel model;
private DefaultTableModel model1;
private JButton addButton = new JButton("Add Customer");
private JButton showButton = new JButton("Show");
private JButton clearButton = new JButton("Rensa");
private JButton createSavingsAccountButton = new JButton("Create Savings Account");
private JButton createCreditAccountButton = new JButton("Create Credit Account");
private JButton deleteAccountButton = new JButton("Delete Account");
private JButton withdrawButton = new JButton("Withdraw");
private JButton depositButton = new JButton("Deposit");
String[] accountColumns = { "ID", "Account Type", "Balance", "Interest" };
String[] transactionColumns = { "Date", "Time", "Amount", "Balance" };
String testdata[][] = { { "101", "Amit", "670000" }, { "102", "Jai", "780000" }, { "101", "Sachin", "700000" } };
public GUImain() {
initiateInstanceVariables();
buildFrame();
}
private void initiateInstanceVariables() {
logic = new BankLogic();
customerList = new JList<Object>();
accountTable = new JTable();
DefaultTableModel model = new DefaultTableModel(0, 0);
model.setColumnIdentifiers(accountColumns);
accountTable.setModel(model);
transactionTable = new JTable();
DefaultTableModel model1 = new DefaultTableModel(0, 0);
model1.setColumnIdentifiers(transactionColumns);
transactionTable.setModel(model1);
model.addRow(new String[] {"data", "data","data", "data"});
nameField = new JTextField();
lastnameField = new JTextField();
pNrField = new JTextField();
nameField.setBorder(BorderFactory.createTitledBorder("Name"));
lastnameField.setBorder(BorderFactory.createTitledBorder("Lastname"));
pNrField.setBorder(BorderFactory.createTitledBorder("pNr"));
}
private void buildFrame() {
setTitle("Bank");
setSize(300, 250);
setLayout(new GridLayout(1, 2));
JPanel bankpanel = new JPanel(new GridLayout(5, 1));
bankpanel.add(nameField);
bankpanel.add(lastnameField);
bankpanel.add(pNrField);
bankpanel.add(addButton);
bankpanel.add(showButton);
bankpanel.add(clearButton);
bankpanel.add(createSavingsAccountButton);
bankpanel.add(createCreditAccountButton);
createSavingsAccountButton.setVisible(false);
createCreditAccountButton.setVisible(false);
addButton.addActionListener(this);
showButton.addActionListener(this);
clearButton.addActionListener(this);
createSavingsAccountButton.addActionListener(this);
createCreditAccountButton.addActionListener(this);
deleteAccountButton.addActionListener(this);
// // ACCOUNT TABLE
accountTable.setCellSelectionEnabled(true);
ListSelectionModel select = accountTable.getSelectionModel();
select.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// // ACCOUNT TABLE
add(bankpanel);
add(customerList);
add(new JScrollPane(accountTable), BorderLayout.CENTER);
add(new JScrollPane(transactionTable), BorderLayout.CENTER);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
// UI LOGIC. This activated the functions below.
public void actionPerformed(ActionEvent event) {
String buttonText = event.getActionCommand();
if (buttonText.equals("Add Customer")) {
addCustomer();
showAccountButtons();
}
if (buttonText.equals("Show")) {
showSelected();
}
if (buttonText.equals("Clear")) {
clear();
}
if (buttonText.equals("Create Savings Account")) {
createSavingsAccount();
}
if (buttonText.equals("Create Credit Account")) {
createCreditAccount();
}
}
private void addCustomer() {
logic.createCustomer(nameField.getText(), lastnameField.getText(), pNrField.getText());
customerList.setListData(logic.getAllCustomers().toArray());
clear();
}
public void createCreditAccount() {
logic.createCreditAccount(pNrField.getText());
model.addRow(new String[] {"data", "data","data", "data"});
}
public void createSavingsAccount() {
logic.createSavingsAccount(pNrField.getText());
model.addRow(new String[] {"data", "data","data", "data"});
}
private void showSelected() {
int position = customerList.getSelectedIndex();
if (position > -1) {
nameField.setText(logic.getNameForPersonAt(position));
lastnameField.setText(logic.getLastNameForPersonAt(position));
pNrField.setText(logic.getpNrAt(position));
} else {
JOptionPane.showMessageDialog(null, "You need a person in the list!");
}
}
private void showAccountButtons() {
createSavingsAccountButton.setVisible(true);
createCreditAccountButton.setVisible(true);
}
private void clear() {
nameField.setText("");
lastnameField.setText("");
pNrField.setText("");
}
}
You have "shadowed variables".
You try to define instance variables but they are null:
private DefaultTableModel model;
private DefaultTableModel model1;
And then you create a local variable which is not null
DefaultTableModel model = new DefaultTableModel(0, 0);
...
DefaultTableModel model1 = new DefaultTableModel(0, 0);
The ActionListener can only access the instance variable but it is null so you get a NPE.
Get rid of the local variables:
model = new DefaultTableModel(0, 0);
...
model1 = new DefaultTableModel(0, 0);
I create a button to copy the selected pixel color.
It works fine if I click the picture(get the pixel value) first, then click the "copy" button. But if I click the "copy" button first, I will receive this error.
Any thoughts?
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Pixel value is null
at a9.ImageEditorController.copy(ImageEditorController.java:81)
at a9.PixelInspectorTool.actionPerformed(PixelInspectorTool.java:95)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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 void copy() {
Pixel selectedB = model.getSelected();
if (selectedB == null) {
throw new IllegalArgumentException("cannot be null"); //line 81
}
PaintBrushToolUI pbtUI = (PaintBrushToolUI) paint_brush_tool.getUI();
pbtUI.changeView(selectedB);
}
public void actionPerformed(ActionEvent arg0) {
for (ToolButtonListener t : tList) {
t.copy(); // this is line 95
System.out.println("Copying");
}
}
Well actually you get this error message because You throw it exactly here:
if (selectedB == null) {
// code bellow throws your exception...
throw new IllegalArgumentException("cannot be null"); //line 81
}
To solve your problem you can check if your model is null here:
for(ToolButtonListener t:tList) {
//check here if it's null for example
if(model.getSelected() != null){
t.copy(); // this is line 95
System.out.println("Copying");
}
}
Or you can make the copy method to check if object is null like this:
public void copy() {
Pixel selectedB= model.getSelected();
if (selectedB != null) {
// throw new IllegalArgumentException("cannot be null"); //line 81
PaintBrushToolUI pbtUI = (PaintBrushToolUI)paint_brush_tool.getUI();
pbtUI.changeView(selectedB);
}
}
This error occurs because before you click that other button to create color the first one(copy button) doesn't have "source" to copy from.
You can also make the copy button inactive until you click the other button. There are various solutions for your problem(probably a lot better than mine) and it all depends on what effect you want to achieve.
I am very new to marshalling and unmarshalling. I need to be able to save and load an xml file in my program. First I will post my wrapper class.
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
//Class created to wrap the list of pc parts on the right Jlist.
#XmlRootElement
public class JlistWrapper {
private List<String> Pcpart;
#XmlElement(name = "Pcpart")
public List<String> getPcParts(){
return Pcpart;
}
public void setPcparts(List<String> Pcpart){
this.Pcpart = Pcpart;
}
}
Now here is my save() method that works:
public static void save(File file) throws Exception{
for (int i = 0; i < computerParts1.size(); i++){
save.add((String)computerParts1.getElementAt(i));
}
//wrapping Jlist data
JlistWrapper wrapper = new JlistWrapper();
wrapper.setPcparts(save);
JAXBContext c = JAXBContext.newInstance(JlistWrapper.class);
Marshaller m = c.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
m.marshal(wrapper, file);
}
For my save method, I originally had the last line set this way to just output the xml to the console. But I was unsure of how to unmarshall from there (any ideas on that as well?).
m.marshal(wrapper, System.out);
Now finally, my load() method that I can't get to unmarshal correctly...
public static void load(File file) throws JAXBException{
JAXBContext context = JAXBContext.newInstance(JlistWrapper.class);
Unmarshaller unmar = context.createUnmarshaller();
//Read XML from file
JlistWrapper wrapper = (JlistWrapper) unmar.unmarshal(file);
save.clear();
save.addAll(wrapper.getPcParts());
}
And here is the error I get when I hit the load button:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.addToPack(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.addToPack(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Scope.add(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty$ReceiverImpl.receive(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.endElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at com.cooksys.assessment.Window.load(Window.java:236)
at com.cooksys.assessment.Window$2.actionPerformed(Window.java:149)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
Let me know if there is anything else you need to answer my question. Thanks ahead of time!
EDIT: I forgot to clarify that I need to unmarshall a list of objects to a JList in my GUI. Sofar I am only able to save the list of objects from a JList into xml.
You need to ensure that getPcParts doesn't return null, either by initializing the field or by doing a lazy init in the getter:
#XmlElement(name = "Pcpart")
public List<String> getPcParts(){
if(Pcpart == null) {
Pcpart = new ArrayList<String>();
}
return Pcpart;
}
The way JAXB unmarshals lists is a bit unusual - it doesn't call the setter, instead it assumes that the getter returns a mutable list which it can add to. The unmarshaller essentially does
theObj.getPcParts().add(theStringValueFromXml)
for each Pcpart element in the XML.
I'm just starting out with swing, but I've been stuck on this issue for about a week and I've tried everything I can think. I'm trying to update the table model as the result of a click on a column header and getting an ArrayIndexOutOfBoundsException.
I've simplified the code here, but can someone please explain why this:
package gradebook.model.courseTable;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
public class CourseTableTest extends JTable {
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
JFrame frame = new JFrame();
frame.add(new JScrollPane(new CourseTable()));
frame.setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
}
});
}
public CourseTableTest(){
super(3, 3);
this.tableHeader.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
setModel(new DefaultTableModel(3, 3));
}
});
}
}
throws this when clicked?:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementData(Unknown Source)
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableColumnModel.getColumn(Unknown Source)
at javax.swing.JTable.getCellRenderer(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintDraggedArea(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.access$700(Unknown Source)
at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementData(Unknown Source)
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableColumnModel.getColumn(Unknown Source)
at javax.swing.JTable.getCellRenderer(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintDraggedArea(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.access$700(Unknown Source)
at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
Edit
Some of you have asked why I would change the model during a click of the column header. In my application, the table columns represent a school assignment. When the header is clicked it opens a dialog box that allows the user to either modify or delete the assignment. If the user clicks delete I would like to remove the column from the table. But any time I try to change the table structure within the click handler I get this error.
The MouseListener must be doing some processing and doesn't like you changing the data in the middle of the processing.
Try:
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
setModel(new DefaultTableModel(3, 3));
}
});
This will let the MouseListener code finish executing before you change the model.
The real question is why would you change the model when you click on the header?
Edit:
As noted by MadProgrammer the first suggestion doesn't work.
As another hack if you are just trying to clear the data in the model you can use:
#Override
public void mousePressed(MouseEvent e)
{
model.setRowCount(0);
model.setRowCount(3);
}
If you want a table with a completely different structure then I would suggest you do something like:
#Override
public void mousePressed(MouseEvent e)
{
scrollPane.setViewportView( new JTable(4, 4) );
}
I try to make Test code about JTable input and refresh.
Insert and delete is working well,
but if I delete or insert data after sort the table, it make's exception:
"AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException : 9>=0" ..
Here's my test code.
How do I fix it?
and.. any other advice?
public class Test extends JFrame{
private DefaultTableModel modelTest = new DefaultTableModel();
private JTable tableTest = new JTable(modelTest);
private JScrollPane paneTest = new JScrollPane(tableTest);
private JButton button1 = new JButton("pattern1");
private JButton button2 = new JButton("pattern2");
private JButton button3 = new JButton("delete");
private void compInit(){
paneTest.setBounds(0, 0,778, 300);
button1.setBounds(250, 320,80,20);
button2.setBounds(450,320,80,20);
button3.setBounds(300,400,80,20);
DefaultTableModel tmp = modelTest;
tmp.addColumn(" ");
tmp.addColumn("col1");
tmp.addColumn("col2");
tmp.addColumn("col3");
tmp.addColumn("col4");
tmp.addColumn("col5");
tmp.addColumn("col6");
tmp.addColumn("col7");
try {
tableTest.setDefaultRenderer(Class.forName("java.lang.String"), new DefaultTableCellRenderer());
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
tableTest.setAutoCreateRowSorter(true);
tableTest.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
tableTest.getColumnModel().getColumn(0).setPreferredWidth(20);
tableTest.getColumnModel().getColumn(1).setPreferredWidth(45);
tableTest.getColumnModel().getColumn(2).setPreferredWidth(110);
tableTest.getColumnModel().getColumn(3).setPreferredWidth(60);
tableTest.getColumnModel().getColumn(4).setPreferredWidth(100);
tableTest.getColumnModel().getColumn(5).setPreferredWidth(227);
tableTest.getColumnModel().getColumn(6).setPreferredWidth(100);
tableTest.getColumnModel().getColumn(7).setPreferredWidth(100);
tableTest.getTableHeader().setForeground(new Color(105,105,105));
this.add(button1);
this.add(button2);
this.add(button3);
this.add(paneTest);
}
private void pattern1(){
for(int i = 0;i<10;i++){
Vector rowData = new Vector<>();
rowData.add(false);
rowData.add(i+1);
rowData.add("a : " + i);
rowData.add("b : " + i);
rowData.add("c : " + i);
rowData.add("d : " + i);
rowData.add("e : " + i);
rowData.add("f : " + i);
modelTest.addRow(rowData);
}
}
private void pattern2(){
for(int i = 0;i<10;i++){
Vector rowData = new Vector<>();
rowData.add(false);
rowData.add(i+1);
rowData.add("z : " + i);
rowData.add("y : " + i);
rowData.add("x : " + i);
rowData.add("w : " + i);
rowData.add("v : " + i);
rowData.add("u : " + i);
modelTest.addRow(rowData);
}
}
private void delete(){
DefaultTableModel tmp = modelTest;
tmp.getDataVector().removeAllElements();
tableTest.repaint();
}
private void eventInit(){
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
pattern1();
}
});
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
pattern2();
}
});
button3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
delete();
}
});
}
public Test(){
this.setLayout(null);
this.compInit();
this.eventInit();
this.setSize(778, 500);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
public static void main(String[] ar){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
new Test();
}
});
}
}
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 3 >= 1
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
at javax.swing.table.TableRowSorter$TableRowSorterModelWrapper.getValueAt(Unknown Source)
at javax.swing.table.TableRowSorter$TableRowSorterModelWrapper.getStringValueAt(Unknown Source)
at javax.swing.DefaultRowSorter.compare(Unknown Source)
at javax.swing.DefaultRowSorter.access$100(Unknown Source)
at javax.swing.DefaultRowSorter$Row.compareTo(Unknown Source)
at javax.swing.DefaultRowSorter$Row.compareTo(Unknown Source)
at java.util.Arrays.binarySearch0(Unknown Source)
at java.util.Arrays.binarySearch(Unknown Source)
at javax.swing.DefaultRowSorter.insertInOrder(Unknown Source)
at javax.swing.DefaultRowSorter.rowsInserted0(Unknown Source)
at javax.swing.DefaultRowSorter.rowsInserted(Unknown Source)
at javax.swing.JTable.notifySorter(Unknown Source)
at javax.swing.JTable.sortedTableChanged(Unknown Source)
at javax.swing.JTable.tableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableRowsInserted(Unknown Source)
at javax.swing.table.DefaultTableModel.insertRow(Unknown Source)
at javax.swing.table.DefaultTableModel.addRow(Unknown Source)
at timer.Test.pattern1(Test.java:77)
at timer.Test.access$0(Test.java:66)
at timer.Test$1.actionPerformed(Test.java:106)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.DefaultRowSorter.getViewToModelAsInts(Unknown Source)
at javax.swing.DefaultRowSorter.rowsInserted0(Unknown Source)
at javax.swing.DefaultRowSorter.rowsInserted(Unknown Source)
at javax.swing.JTable.notifySorter(Unknown Source)
at javax.swing.JTable.sortedTableChanged(Unknown Source)
at javax.swing.JTable.tableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableRowsInserted(Unknown Source)
at javax.swing.table.DefaultTableModel.insertRow(Unknown Source)
at javax.swing.table.DefaultTableModel.addRow(Unknown Source)
at timer.Test.pattern2(Test.java:92)
at timer.Test.access$1(Test.java:81)
at timer.Test$2.actionPerformed(Test.java:111)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
Whenever you change your model vector directly, make sure to notify the container about this. You fail to do that in the following method:
private void delete(){
DefaultTableModel tmp = modelTest;
tmp.getDataVector().removeAllElements();
tableTest.repaint();
}
After the removeAllElements() you should call tmp.fireTableDataChanged(). Something like:
private void delete(){
DefaultTableModel tmp = modelTest;
tmp.getDataVector().removeAllElements();
tmp.fireTableDataChanged();
tableTest.repaint();
}
Reason: Changes directly to the Model's underlying data vector are not automatically propagated to the View. You are changing a Vector this way, not a Model. Changes to the Model are propagated to the View. Your calls to Model.addRow() inform the View that a row was added. Your Vector.removeAllElements() call is not informed to the View so after that call View and Model are out of sync (that is, if they weren't both empty before). The call to Model.fireTableDataChanged informs the View that the whole table data in the Model has changed. After this call they are in sync again. When Model and View are out of sync, you can expect ArrayOutOfBoundException's to occur e.g. during sorting.
I also had this problem recently - a NullPointerException caused by DefaultRowSorter.getViewToModelAsInts.
The problem for me is that I was trying to directly update the GUI when an exception was thrown in SwingWorker's doInBackground() method. I found the exact solution to my particular problem here. Maybe that will help you or at least point you in the right direction as I wouldn't be surprised if your problem was because you are trying to manipulate the GUI from the wrong thread.