Java.awt.Window: inner size
Whilst it is clearly easy to work out the external size of a java.awt.Window object, does anybody have a way of querying the inner size of the Window (i.e. the available internal space, once the window's borders have been taken into account )?
Many thanks
Ali
GAHick,
Get the total window size, then get the insets of the window, subtract the window size from the windows insets and you will be left with the total available internal space.
-- Bud
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Hi I've tried the following below (/** My Code **/) and get a compilation error: Window is not public in java.awt.Window; cannot be accessed from outside package.
I did set the JDK1.4 path in the autoexec.bat. The API 1.4 describes Window like:
public class Window
extends Container
/** My Code **/
import java.awt.*;
class WarningWindow extends Window
/** With the below code everything compiles **/
import java.awt.*;
class WarningWindow extends Container
/** END My Code **/
Can someone please tell me why I get this above error and how can I manage to import the Window class.
Thank You
LHello,
The problem is that Window constructor is not declared as public.
But i don't know why JDK1.4 refuse that.
By setting "package java.awt;" you'll access all these method but that is NOT a good solution (you should use Dialog, Frame or Container).
But there is still something strange... Why JDK1.4 refuses compiling that ?????? -
Getting a java.awt.Window.pack(unknown source) error
Hello,
This is the exact error stack:
ERROR: 10:48:21,503 - TcLogger$IC_PrintStream.println:?
java.lang.NullPointerException
java.lang.NullPointerException
at com.teamcenter.rac.util.PropertyLayout.askRowPreferredSize(Unknown Source)
at com.teamcenter.rac.util.PropertyLayout.preferredLayoutSize(Unknown Source)
at com.teamcenter.rac.util.PropertyLayout.layoutContainer(Unknown Source)
at java.awt.Container.layout(Unknown Source)
at java.awt.Container.doLayout(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validate(Unknown Source)
at java.awt.Window.pack(Unknown Source)
at com.honda.ergo.pergo.ProcErgoJDialog.createProcErgoDialog(ProcErgoJDialog.java:789)
at com.honda.ergo.pergo.ProcErgoJDialog.<init>(ProcErgoJDialog.java:328)
at com.honda.cme.actions.ErgoAssessmentAppAction.run(ErgoAssessmentAppAction.java:139)
at java.lang.Thread.run(Unknown Source)
I'm sure it has something to do with the PropertyLayout (Layout Manager) that I'm using but I don't know what. It works fine on one system but does not work or another.
Thanks,dumas9 wrote:
at java.awt.Window.pack(Unknown Source)
at com.honda.ergo.pergo.ProcErgoJDialog.createProcErgoDialog(ProcErgoJDialog.java:789)
at com.honda.ergo.pergo.ProcErgoJDialog.<init>(ProcErgoJDialog.java:328)
at com.honda.cme.actions.ErgoAssessmentAppAction.run(ErgoAssessmentAppAction.java:139)
at java.lang.Thread.run(Unknown Source)It looks like you're not running the Swing GUI on the EDT and since your problem is intermittent it's a likely cause of the problem. Search on "java swing concurrency tutorial" for more information. -
How to disable maximize button of the java.awt.Window ????
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Help neededHow to spam the forum with the same fuqin question. Please get lost.
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Java.io.NotSerializableException: java.awt.BasicStroke - really confusing
I have a class Box which has two member Size and Location, both Serializable.
Then I have several classes (e.g. Node) which extend Box.
None of all the classes (Box, Size, Location and all extensions of Box e.g. Node) use BasicStroke. I commented out the import of BasicStroke in all classes that are Serializable, so it cannot be used anywhere.
The problem is I use drag and drop, and when Box is also Serializable I get the following error when trying to drop:
java.io.NotSerializableException: java.awt.BasicStroke
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1251)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1075)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:391)
at java.util.Vector.writeObject(Vector.java:1018)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
at sun.awt.datatransfer.TransferableProxy.getTransferData(TransferableProxy.java:66)
at java.awt.dnd.DropTargetContext$TransferableProxy.getTransferData(DropTargetContext.java:359)
at kfotobook.kgui.KPageViewer.getFlavorData(KPageViewer.java:767)
at kfotobook.kgui.KPageViewer.getFlavorData(KPageViewer.java:750)
at kfotobook.kgui.KPageViewer.drop(KPageViewer.java:791)
at java.awt.dnd.DropTarget.drop(DropTarget.java:430)
at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:500)
at sun.awt.dnd.SunDropTargetContextPeer.access$800(SunDropTargetContextPeer.java:53)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:812)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:736)
at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:29)
at java.awt.Component.dispatchEventImpl(Component.java:3826)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:3963)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3817)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
I do not know how to better describe the error, because I have no clue why BasicStrokes is tried to serialize at all. I am really confused, but perhaps somebody has seen something similar and can give a hint.
Message was edited by:
kudiThanks for the hint. Actually I must say once more that I was too tired that I have overseen a memeber field because of bad code layout :-( I better went to sleep...
But there is still something confusing, that is also the reason why I did not search for the fields in the right class.
So I have a class Box and a class Node which extends Box. Node is the one which contains the evil AWT references. When I declare only Node as Serializable, it works. But when I also declare the super class Box as Serializable the error occured.
In my opinion a Serializable sub class with a super class which does not implement Serializable does not make sence, but as an accident I did it. What is the semantic in such a case? (At least I know it could not serialize the sub class as expected...)
Message was edited by:
kudi -
Java.awt.IllegalComponentStateException in JTable
Hi folks,
I am trying to write a JTable cell validation. Input data in a cell, if failure, prompt message and set focus & editing back to the cell. I've tried InputVerifier() but it doesn't work since I can easily use the mouse click to shift to other cells in the same table.
What I am trying to do now is to define my DefaultCellEditor. I record the row & index position when getting focus. In the lost focus event, do the validation and set the focus & editing back if failure. Seems it works fine. However, when I randomly click different cells in the table quickly. It prompts:
"java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location"
Here is my stack dump:
at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:1487)
at java.awt.Component.getLocationOnScreen(Component.java:1461)
at javax.swing.Autoscroller.mouseDragged(Autoscroller.java:79)
at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:2759)
at java.awt.Component.processEvent(Component.java:4822)
at java.awt.Container.processEvent(Container.java:1525)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1582)
at java.awt.Component.dispatchEvent(Component.java:3367)
at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.repostEvent(BasicTableUI.java:475)
at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mouseDragged(BasicTableUI.java:554)
at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:258)
at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:257)
at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:257)
at java.awt.Component.processMouseMotionEvent(Component.java:5069)
at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:2763)
at java.awt.Component.processEvent(Component.java:4822)
at java.awt.Container.processEvent(Container.java:1525)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1582)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3359)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3091)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3004)
at java.awt.Container.dispatchEventImpl(Container.java:1568)
at java.awt.Window.dispatchEventImpl(Window.java:1581)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:191)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
Also, enclosed is my modified DefaultCellEditor class. Your input will be greatly appreicated. Thanks.
class NewDefaultCellEditor extends DefaultCellEditor {
public NewDefaultCellEditor(JTextField jTextField) {
super(jTextField);
this.setClickCountToStart(1);
jTextField.addFocusListener(new FocusAdapter() {
JTable tbl;
int row;
int column;
public void focusGained(FocusEvent e) {
tbl = (JTable)((JTextField)e.getSource()).getParent();
row = tbl.getEditingRow();
column = tbl.getEditingColumn();
public void focusLost(FocusEvent e) {
/*** Put validation here, execute the following if failed ***/
tbl.editCellAt(row, column);
((JTextField)e.getSource()).requestFocus();Your use in a JTable isn't too clear to me, but I feel you're overthinking the basic requirement:
I have an extended JComboBox which is meant to display its information only. Thus it
- does not allow any selection
- shows the first item of the list in the TextField only and not once more in the listI don't see the need for duplicating the model and using a popup menu listener.
import java.awt.Component;
import javax.swing.*;
public class DisplayOnlyComboBoxDemo {
public static void main(String[] args) throws Exception {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new DisplayOnlyComboBoxDemo().makeUI();
public void makeUI() {
JFrame frame = new JFrame();
frame.add(new DisplayOnlyComboBox("One", new String[]{"Two", "Three", "Four", "Five"}));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
class DisplayOnlyComboBox extends JComboBox {
private String firstItem;
public DisplayOnlyComboBox(String firstItem, String[] items) {
super(items);
this.firstItem = firstItem;
setRenderer(new DefaultListCellRenderer() {
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (index == -1) {
setText(DisplayOnlyComboBox.this.firstItem);
return this;
}db -
I have few questions about linux. Is there any one who can give me the correct o/p of the following errorecode
Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:134)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
at java.awt.Window.init(Window.java:231)
at java.awt.Window.<init>(Window.java:275)
at java.awt.Frame.<init>(Frame.java:401)
at java.awt.Frame.<init>(Frame.java:366)
at jxml1.<init>(jxml1.java:14)
at jxml1.main(jxml1.java:78)
$ Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:134)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
at java.awt.Window.init(Window.java:231)
at java.awt.Window.<init>(Window.java:275)
at java.awt.Frame.<init>(Frame.java:401)
at java.awt.Frame.<init>(Frame.java:366)
at jxml1.<init>(jxml1.java:14)
at jxml1.main(jxml1.java:78)
$
^C$Hi,
Most often than not this is related to xhost in unix-shell systems.
Try the following
$setenv DISPLAY :0
$xhost +
or simply
$xhost +If you need more security add just your user after xhost + command
Hope this helps
Aviroop -
How to make awt window without owner
The java.awt.Window(owner) requires owner but I want it to be top level without any other owner, how to do it
.:moby:.Sorry.
You have to open up a frame, what use would be a top level window in a GUI that can't me minimized, moved or closed? Why do you want it to stand alone? -
How to restrict the maximum size of a java.awt.ScrollPane
Dear all,
I would like to implement a scroll pane which is resizable, but not to a size exceeding the maximum size of the java.awt.Canvas that it contains.
I've sort of managed to do this by writing a subclass of java.awt.ScrollPane which implements java.awt.event.ComponentListener and has a componentResized method that checks whether the ScrollPane's viewport width (height) exceeds the content's preferred size, and if so, resizes the pane appropriately (see code below).
It seems to me, however, that there ought to be a simpler way to achieve this.
One slightly weird thing is that when the downsizing of the pane happens, the content can once be moved to the left by sliding the horizontal scrollbar, but not by clicking on the arrows. This causes one column of gray pixels to disappear and the rightmost column of the content to appear; subsequent actions on the scrollbar does not have any further effect. Likewise, the vertical scrollbar can also be moved up once.
Also, I would like a java.awt.Frame containing such a restrictedly resizable scrollpane, such that the Frame cannot be resized by the user such that its inside is larger than the maximum size of the scrollpane. The difficulty I encountered with that is that setSize on a Frame appears to set the size of the window including the decorations provided by the window manager (fvwm2, if that matters), and I haven't been able to find anything similar to getViewportSize, which would let me find out the size of the area inside the Frame which is available for the scrollpane which the frame contains.
Thanks in advance for hints and advice.
Here's the code of the componentResized method:
public void componentResized(java.awt.event.ComponentEvent e)
java.awt.Dimension contentSize = this.content.getPreferredSize();
this.content.setSize(contentSize);
java.awt.Dimension viewportSize = getViewportSize();
System.err.println("MaxSizeScrollPane: contentSize = " + contentSize);
System.err.println("MaxSizeScrollPane: viewportSize = " + viewportSize);
int dx = Math.max(0, (int) (viewportSize.getWidth() - contentSize.getWidth()));
int dy = Math.max(0, (int) (viewportSize.getHeight() - contentSize.getHeight()));
System.err.println("MaxSizeScrollPane: dx = " + dx + ", dy = " + dy);
if ((dx > 0) || (dy > 0))
java.awt.Dimension currentSize = getSize();
System.err.println("MaxSizeScrollPane: currentSize = " + currentSize);
setSize(new java.awt.Dimension(((int) currentSize.getWidth()) - dx, ((int) currentSize.getHeight()) - dy));
System.err.println();
}Best regards, Janimport java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class ScrollPaneTest
GraphicCanvas canvas;
CustomScrollPane scrollPane;
private Panel getScrollPanel()
canvas = new GraphicCanvas();
scrollPane = new CustomScrollPane();
scrollPane.add(canvas);
// GridBagLayout allows scrollPane to remain at
// its preferred size during resizing activity
Panel panel = new Panel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
panel.add(scrollPane, gbc);
return panel;
private WindowListener closer = new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
private Panel getUIPanel()
int w = canvas.width;
int h = canvas.height;
int visible = 100;
int minimum = 200;
int maximum = 500;
final Scrollbar
width = new Scrollbar(Scrollbar.HORIZONTAL, w,
visible, minimum, maximum),
height = new Scrollbar(Scrollbar.HORIZONTAL, h,
visible, minimum, maximum);
AdjustmentListener l = new AdjustmentListener()
public void adjustmentValueChanged(AdjustmentEvent e)
Scrollbar scrollbar = (Scrollbar)e.getSource();
int value = scrollbar.getValue();
if(scrollbar == width)
canvas.setWidth(value);
if(scrollbar == height)
canvas.setHeight(value);
canvas.invalidate();
scrollPane.validate();
width.addAdjustmentListener(l);
height.addAdjustmentListener(l);
Panel panel = new Panel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(2,2,2,2);
gbc.weightx = 1.0;
addComponents(new Label("width"), width, panel, gbc);
addComponents(new Label("height"), height, panel, gbc);
gbc.anchor = GridBagConstraints.CENTER;
return panel;
private void addComponents(Component c1, Component c2, Container c,
GridBagConstraints gbc)
gbc.anchor = GridBagConstraints.EAST;
c.add(c1, gbc);
gbc.anchor = GridBagConstraints.WEST;
c.add(c2, gbc);
public static void main(String[] args)
ScrollPaneTest test = new ScrollPaneTest();
Frame f = new Frame();
f.addWindowListener(test.closer);
f.add(test.getScrollPanel());
f.add(test.getUIPanel(), "South");
f.pack();
f.setLocation(200,200);
f.setVisible(true);
f.addComponentListener(new FrameSizer(f));
class GraphicCanvas extends Canvas
int width, height;
public GraphicCanvas()
width = 300;
height = 300;
public void paint(Graphics g)
super.paint(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int dia = Math.min(width, height)*7/8;
g2.setPaint(Color.blue);
g2.draw(new Rectangle2D.Double(width/16, height/16, width*7/8, height*7/8));
g2.setPaint(Color.green.darker());
g2.draw(new Ellipse2D.Double(width/2 - dia/2, height/2 - dia/2, dia-1, dia-1));
g2.setPaint(Color.red);
g2.draw(new Line2D.Double(width/16, height*15/16-1, width*15/16-1, height/16));
public Dimension getPreferredSize()
return new Dimension(width, height);
public Dimension getMaximumSize()
return getPreferredSize();
public void setWidth(int w)
width = w;
repaint();
public void setHeight(int h)
height = h;
repaint();
class CustomScrollPane extends ScrollPane
Dimension minimumSize;
public Dimension getPreferredSize()
Component child = getComponent(0);
if(child != null)
Dimension d = child.getPreferredSize();
if(minimumSize == null)
minimumSize = (Dimension)d.clone();
Insets insets = getInsets();
d.width += insets.left + insets.right;
d.height += insets.top + insets.bottom;
return d;
return null;
public Dimension getMinimumSize()
return minimumSize;
public Dimension getMaximumSize()
Component child = getComponent(0);
if(child != null)
return child.getMaximumSize();
return null;
class FrameSizer extends ComponentAdapter
Frame f;
public FrameSizer(Frame f)
this.f = f;
public void componentResized(ComponentEvent e)
Dimension needed = getSizeForViewport();
Dimension size = f.getSize();
if(size.width > needed.width || size.height > needed.height)
f.setSize(needed);
f.pack();
* returns the minimum required frame size that will allow
* the scrollPane to be displayed at its preferred size
private Dimension getSizeForViewport()
ScrollPane scrollPane = getScrollPane(f);
Insets insets = f.getInsets();
int w = scrollPane.getWidth() + insets.left + insets.right;
int h = getHeightOfChildren() + insets.top + insets.bottom;
return new Dimension(w, h);
private ScrollPane getScrollPane(Container cont)
Component[] c = cont.getComponents();
for(int j = 0; j < c.length; j++)
if(c[j] instanceof ScrollPane)
return (ScrollPane)c[j];
if(((Container)c[j]).getComponentCount() > 0)
return getScrollPane((Container)c[j]);
return null;
private int getHeightOfChildren()
Component[] c = f.getComponents();
int extraHeight = 0;
for(int j = 0; j < c.length; j++)
int height;
if(((Container)c[j]).getComponent(0) instanceof ScrollPane)
height = ((Container)c[j]).getComponent(0).getHeight();
else
height = c[j].getHeight();
extraHeight += height;
return extraHeight;
} -
How can i increase a size of java plugin window in developer10g form?
Dear Friends,
I made a master detail form in developer10g form. In the form i m unable to see all the fields in java plugin window bcoz its small.
how can i increase the size of java plugin window?
Thanks in advance.
Regards,
KamranHi Kamran
Just modify width and height values to 100% in the forms\server\formsweb.cfg file:
# Forms applet parameter
width=100%
# Forms applet parameter
height=100%
After this restart OC4J instance.
Hope this helps
Regards
Carlos -
OutOfMemory error in java.awt.image.DataBufferInt. init
We have an applet application that performs Print Preview of the images in the canvas. The images are like a network of entities (it has pictures of the entities involve (let's say Person) and how it links to other entities). We are using IE to launch the applet.
We set min heap space to 128MB, JVM max heap space to 256MB, java plugin max heap space to 256MB using the Control Panel > Java.
When the canvas width is about 54860 and height is 1644 and perform Print Preview, it thows an OutOfMemoryError in java.awt.image.DataBufferInt.<int>, hence, the Print Preview page is not shown. The complete stack trace (and logs) is as follows:
Width: 54860 H: 1644
Max heap: 254 # using Runtime.getRuntime().maxMemory()
javaplugin.maxHeapSize: 256M # using System.getProperties("javaplugin.maxHeapSize")
n page x n page : 1x1
Exception in thread "AWT-EventQueue-2" java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferInt.<init>(Unknown Source)
at java.awt.image.Raster.createPackedRaster(Unknown Source)
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(Unknown Source)
at java.awt.image.BufferedImage.<init>(Unknown Source)
at com.azeus.gdi.chart.GDIChart.preparePreview(GDIChart.java:731)
at com.azeus.gdi.chart.GDIChart.getPreview(GDIChart.java:893)
at com.azeus.gdi.ui.GDIUserInterface.printPreviewOp(GDIUserInterface.java:1526)
at com.azeus.gdi.ui.GDIUserInterface$21.actionPerformed(GDIUserInterface.java:1438)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.Component.dispatchEvent(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)
Drilling down the cause of the problem. The OutOfMemory occurred in the constructor of DataBufferInt when it tried to create an int array:
public DataBufferInt(int size) {
super(STABLE, TYPE_INT, size);
data = new int[size]; # this part produce out of memory error when size = width X height
bankdata = new int[1][];
bankdata[0] = data;
The OutOfMemory error occurred when size is width * height (54860 X 1644) which is 90,189,840 bytes (~86MB).
I can replicate the OutOfMemory error when initiating an int array using a test class when it uses the default max heap space but if I increase the heap space to 256MB, it cannot be replicated in the test class.
Using a smaller width and height with product not exceeding 64MB, the applet can perform Print Preview successfully.
Given this, I think the java applet is not using the value assigned in javaplugin.maxHeapSize to set the max heap space, hence, it still uses the default max heap size and throws OutOfMemory in int array when size exceeds the default max heap space which is 64MB.
For additional information, below is some of the java properties (when press S in java applet console):
browser = sun.plugin
browser.vendor = Sun Microsystems, Inc.
browser.version = 1.1
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\PROGRA~1\Java\jre6\classes
java.class.version = 50.0
java.class.version.applet = true
java.runtime.name = Java(TM) SE Runtime Environment
java.runtime.version = 1.6.0_17-b04
java.specification.version = 1.6
java.vendor.applet = true
java.version = 1.6.0_17
java.version.applet = true
javaplugin.maxHeapSpace = 256M
javaplugin.nodotversion = 160_17
javaplugin.version = 1.6.0_17
javaplugin.vm.options = -Xms128M -Djavaplugin.maxHeapSpace=256M -Xmx256m -Xms128M
javawebstart.version = javaws-1.6.0_17
Kindly advise if this is a bug in JRE or wrong setting. If wrong setting, please advise on the proper way to set the heap space to prevent OutOfMemory in initializing int array.
Thanks a lot.
Edited by: rei_xanther on Jun 28, 2010 12:01 AM
Edited by: rei_xanther on Jun 28, 2010 12:37 AMrei_xanther wrote:
..But the maximum value of the int data type is 2,147,483,647. That is the maximum positive integer value that can be stored in (the 4 bytes of) a signed int, but..
..The value that I passed in the int array size is only 90,189,840...its only connection with RAM is that each int requires 4 bytes of memory to hold it.
new int[size] -- size is 90,189,840Sure. So the number of bytes required to hold those 90,189,840 ints is 360,759,360.
I assumed that one element in the int array is 1 byte. ..Your assumption is wrong. How could it be possible to store 32 bits (4 bytes) in 8 bits (1 byte)? (a)
a) Short of some clever compression algorithm applied to the data. -
Java.awt.Container.add(Container.java:345) how can i handle this
dear all,
i want to design an outlook for a chat applet. but this seems to tough as i am getting a run time error
my code is:
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
* the import that are required for this class
public class outer extends Frame //implements ActionListener, Runnable
private TextField txtusername,txtpassword,txtroomname;
private Label lblusername,lblpassword,lblroomname,lbllistofrooms;
Button okBtn,exitBut;
Color backColor=null,btnBackClr=null,btnForeClr=null;
String[] roomsavailable = {" one ", " two ", " three", " four"};
private JList rooms = new JList(roomsavailable);
/** the costructor*/
public outer()
{ // super(st);
backColor=new Color(200,200,255);
btnBackClr=new Color(225,240,255);
btnForeClr=new Color(205,205,205);
setBackground(backColor);
setLayout(null);
lblusername = new Label("Username");
lblusername.reshape(insets().left+5,insets().top+10,60,20);
add(lblusername);
txtusername=new TextField();
txtusername.reshape(insets().left+75,insets().top+10,60,20);
add(txtusername);
lblpassword = new Label("Password");
lblpassword.reshape(insets().left+5,insets().top+30,60,20);
add(lblpassword);
txtpassword=new TextField();
txtpassword.reshape(insets().left+75,insets().top+30,60,20);
add(txtpassword);
lblroomname = new Label("Select Room");
lblroomname.reshape(insets().left+5,insets().top+50,60,20);
add(lblroomname);
txtroomname=new TextField();
txtroomname.reshape(insets().left+75,insets().top+50,60,20);
add(txtroomname);
okBtn=new Button("Login");
okBtn.reshape(insets().left+25,insets().top+80,60,20);
add(okBtn);
// okBtn.addActionListener(this);
exitBut=new Button("EXIT");
exitBut.reshape(insets().left+50,insets().top+80,60,20);
add(exitBut);
// exitBut.addActionListener(this);
public static void main(String[] args)
// Create a JFrame
JFrame frame = new JFrame("client side");
// Create a outer class object
outer outerobj = new outer();
// Add the outer to the JFrame
frame.getContentPane().add(outerobj, BorderLayout.WEST);
// Set Jframe size
frame.setSize(800, 400);
//set resizable true
frame.setResizable(true);
// Set JFrame to visible
frame.setVisible(true);
// set the close operation so that the Application terminates when closed
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
when i compile it it compiles but gives run time error like this
RUN TIME error:
Exception in thread "main" java.lang.IllegalArgumentException: adding a window
to a container
at java.awt.Container.addImpl(Container.java:434)
at java.awt.Container.add(Container.java:345)
at outer.main(outer.java:75)
Press any key to continue...
i know erroe in this line
frame.getContentPane().add(outerobj, BorderLayout.WEST);
but how shall i add to get the proper layout by getting benifit of insets method
reply soon
pleaseYou can't add a frame to a frame.
Try chaing the class definition from
public class outer extends Frameto
public class outer extends PanelPlease note to format your code (you'll get a faster response) use [ code]
Object names should always start with a capital letter. outer --> Outer -
Very simple Java AWT Frame resize question
In the following code, I create an awt Frame. Unfortunately, when I run the resulting Java application (on Windows) and use the mouse to resize the window, none of the Frame's resize/setSize methods get called. Can anyone explain why this is?
Thanks
Greg
import java.awt.* ;
public class Junk extends Frame {
public static void main (String args[])
Junk j = new Junk ();
j.show ();
public void resize(Dimension arg0)
super.resize(arg0);
public void resize(int arg0, int arg1)
super.resize(arg0, arg1);
public void setSize(Dimension arg0)
super.setSize(arg0);
public void setSize(int arg0, int arg1)
super.setSize(arg0, arg1);
}When the user resizes the frame with the mouse, the resizing action probably happens entirely on the Frame's peer, without the java.awt.Frame getting involved at all. setSize() and [deprecated] resize() allow an application to programmatically change the size of a Frame, but the Frame just passes the new size to its peer.
If you want to detect when your Frame has been resized, use addComponentListener to register a component listener on the Frame, and then put your code in the componentResized method of the listener. -
If Statement in java.awt paint
import java.applet.Applet; //bring in the applet class
import java.awt.*; //bring in the graphics class
import java.awt.event.*; //bring in the event class
import java.text.DecimalFormat; //bring in the decimal format class
import java.lang.Float; //bring in the float class
public class Bmi extends Applet implements ActionListener { //begin program and start ActionListener
Label weight, height; //define Label variable
TextField weighttext, heighttext; //define TextField variables
Button calculate; //define button variables
float index, wt, ht, max, min; //define float variables
DecimalFormat fmt2 = new DecimalFormat("#.00"); //set decimal format for reals
public void init() { //begin init()
weight = new Label("Please enter your weight in Kg. (2 decimal places): "); //define content of Label weight
weighttext = new TextField(6); //define size of TextField
height = new Label("Please enter your height in Metres (2 decimal places): "); //define content of Label height
heighttext = new TextField(5); //define size of TextField
calculate = new Button("Calculate!!"); //define content of Button
add(weight); //add Label weight to the GUI
add(weighttext); //add TextField weighttext to the GUI
add(height); //add Label height to the GUI
add(heighttext); //add TextField heighttext to the GUI
add(calculate); //add button calculate to the GUI
calculate.addActionListener(this); //wait for button to be returned
wt = 0; //reset wt to 0
index = 0; //reset index to 0
ht = 0; //reset ht to 0
max = 0; //reset max to 0
min = 0; //reset min to 0
public void actionPerformed( ActionEvent e ) { //run upon return of button
wt = Float.parseFloat(weighttext.getText()); //convert weighttext from String to Float
ht = Float.parseFloat(heighttext.getText()); //covert heighttext from String to Float
repaint(); //refresh paint area
public float indexer() //begin indexer method
float ind; //delare local variable ind
ind = wt/(ht*ht); //perform calculation
return ind; //make indexer() the value of variable ind
} // end of indexer method
public float maxWeight() //begin maxWeight method
float maxwt; //declare local variable maxwt
final float UPPER = 25.0f; //declare variable UPPER as a float with a decimal value of 25.0
maxwt = UPPER*ht*ht; //perform calculation
return maxwt; //make maxWeight() the value of variable maxwt
} // end of maxWeight method
public float minWeight() //begin minWeight method
float minwt; //declare local variable minwt
final float LOWER= 20.0f; //declare variable LOWER as a float with a decimal value of 20.0
minwt = LOWER*ht*ht; //perform calculation
return minwt; //make minWeight() the value of variable minwt
} // end of minWeight method
public void paint(Graphics g) //begin paint method, define g as Graphics
index=indexer(); //covert method indexer() to variable index
max=maxWeight(); //convert method maxWeight() to variable max
min=minWeight(); //convert method minWeight() to variable min
g.setFont(new Font("Verdana", Font.ITALIC, 15)); //define font, weight and size
g.setColor(new Color(90,90,90)); //set new colour
g.drawRect(5,100,300,75); //define size of rectangle
g.setColor(new Color(255,107,9)); //set new colour
g.drawString("BMI is " + fmt2.format(index) + " for " + fmt2.format(wt) + "kg",20,120); //create string in paint, define its on screen position
g.drawString("Maximum bodyweight is " + fmt2.format(max) + "kg", 20,140); //create string in paint, define its on screen position
g.drawString("Minimum bodyweight is " + fmt2.format(min) + "kg", 20,160); //create string in paint, define its on screen position
} // end of paint method
} // end of Bmi classI have written the above code to calculate someones BMI (Body Mass Index). Basically as you can see it recieves a weight and height from the user and calculates the rest. But whilst that good I would like to know how I can make it tell the user something to the effect of "Your overweight" or "Your underweight". The if statement runs like this:
if (wt > max)This forum doesn't quite handle <> properly. The greater and less than symbols. So above you will see > this is the html character code for a greater than symbol so please read it as such.
And then if wt is greater than max then it will say "Your overweight".
But I can't figure out how to include it in the above program. Becuase it won't run in paint, atleast it won't the way I have done it previously. So can you think of any other ways?
Help much appreciated,
SimonThanks very much that works well.
Simon
My code now looks like this: import java.applet.Applet; //bring in the applet class
import java.awt.*; //bring in the graphics class
import java.awt.event.*; //bring in the event class
import java.text.DecimalFormat; //bring in the decimal format class
import java.lang.Float; //bring in the float class
public class Bmi extends Applet implements ActionListener { //begin program and start ActionListener
Label weight, height; //define Label variable
TextField weighttext, heighttext; //define TextField variables
Button calculate; //define button variables
float index, wt, ht, max, min; //define float variables
DecimalFormat fmt2 = new DecimalFormat("#.00"); //set decimal format for reals
public void init() { //begin init()
weight = new Label("Please enter your weight in Kg. (2 decimal places): "); //define content of Label weight
weighttext = new TextField(6); //define size of TextField
height = new Label("Please enter your height in Metres (2 decimal places): "); //define content of Label height
heighttext = new TextField(5); //define size of TextField
calculate = new Button("Calculate!!"); //define content of Button
add(weight); //add Label weight to the GUI
add(weighttext); //add TextField weighttext to the GUI
add(height); //add Label height to the GUI
add(heighttext); //add TextField heighttext to the GUI
add(calculate); //add button calculate to the GUI
calculate.addActionListener(this); //wait for button to be returned
wt = 0; //reset wt to 0
index = 0; //reset index to 0
ht = 0; //reset ht to 0
max = 0; //reset max to 0
min = 0; //reset min to 0
public void actionPerformed( ActionEvent e ) { //run upon return of button
wt = Float.parseFloat(weighttext.getText()); //convert weighttext from String to Float
ht = Float.parseFloat(heighttext.getText()); //covert heighttext from String to Float
repaint(); //refresh paint area
public float indexer() //begin indexer method
float ind; //delare local variable ind
ind = wt/(ht*ht); //perform calculation
return ind; //make indexer() the value of variable ind
} // end of indexer method
public float maxWeight() //begin maxWeight method
float maxwt; //declare local variable maxwt
final float UPPER = 25.0f; //declare variable UPPER as a float with a decimal value of 25.0
maxwt = UPPER*ht*ht; //perform calculation
return maxwt; //make maxWeight() the value of variable maxwt
} // end of maxWeight method
public float minWeight() //begin minWeight method
float minwt; //declare local variable minwt
final float LOWER= 20.0f; //declare variable LOWER as a float with a decimal value of 20.0
minwt = LOWER*ht*ht; //perform calculation
return minwt; //make minWeight() the value of variable minwt
} // end of minWeight method
public void you(Graphics g)
String statement;
if(wt > max) statement="You are very fat";
else if(wt < min) statement="You are very thin";
else statement="You are in the recommended weight range for your height";
g.drawString(statement, 20,210);
public void paint(Graphics g) //begin paint method, define g as Graphics
you(g);
index=indexer(); //covert method indexer() to variable index
max=maxWeight(); //convert method maxWeight() to variable max
min=minWeight(); //convert method minWeight() to variable min
g.setFont(new Font("Verdana", Font.ITALIC, 15)); //define font, weight and size
g.setColor(new Color(90,90,90)); //set new colour
g.drawRect(5,100,300,75); //define size of rectangle
g.setColor(new Color(255,107,9)); //set new colour
g.drawString("BMI is " + fmt2.format(index) + " for " + fmt2.format(wt) + "kg",20,120); //create string in paint, define its on screen position
g.drawString("Maximum bodyweight is " + fmt2.format(max) + "kg", 20,140); //create string in paint, define its on screen position
g.drawString("Minimum bodyweight is " + fmt2.format(min) + "kg", 20,160); //create string in paint, define its on screen position
} // end of paint method
} // end of BmiThanks again,
Simon -
Java.awt.Dialog in Java 1.6 has a memory leak
When a modal Dialog opens a modal sub-dialog, the Dialog stays in memory after both the sub-dialog and the Dialog itself is disposed.
The field that contains the leaked object is Dialog.modalDialogs (static). The methods which causes the leak are Dialog.modalHide and Dialog.modalShow.
Whenever a modal Dialog is opened, Dialog.modalShow is called, and adds itself to Dialog.modalDialogs.
When it closes, Dialog.modalHide is called and removes one copy of itself from Dialog.modalDialogs. Then Dialog.modalShow is called on all previously blocked modal dialogs. When the sub-dialog is opened and closed, Dialog.modalDialogs contains two references to the main Dialog, and only one of them is removed when Dialog.modalHide for that Dialog is called.
To detect the leak, just put a break point in Dialog.modalHide, after modalDialogs.remove(this);. When opening a Dialog and closing it without opening a sub-dialog, the Dialog.modalDialogs field should be empty. When a sub-dialog was opened and closed before the main Dialog is closed, the Dialog.modalDialogs field contains a reference to the disposed main Dialog.
This leak does not exist in 1.5.0_10 (no Dialog.modalDialogs field). I have searched the bug database, but I have not found this bug there. Could anyone confirm this?
A simple code to reproduce the leak:
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Test {
public static void main(String[] args) {
final JFrame frame = new JFrame() {
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
JButton button = new JButton("Dialog");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent aE) {
JButton subButton = new JButton("SubDialog");
subButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent aE) {
JOptionPane.showMessageDialog(frame, "SubDialog");
JOptionPane.showMessageDialog(frame, subButton);
frame.getContentPane().add(button);
frame.pack();
// Center the window
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}Sorry, I just found the bug in the bugdatabase (with google of course,):
[http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6497929]
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