Ok, I am working on this program. It works so long as I do not add the code that I want to use to make a pop up dialog box.

Basically, I have an array setup. I have it to were I can click a check box and a certain drawing will pop into view. On one of them, I want to use the following code to display Message Dialog box to show the user what is going on.

JOptionPane.showMessageDialog(null, " Insert message once you get this fixed ", "Message Title", JOptionPane.INFORMATION_MESSAGE);

This basically causes the program to freeze. Also, the pop up will not display the text that it should, "Insert message once you get this fixed "

----

If I change the code to

JOptionPane.showInternalMessageDialog(null, "information", "information", JOptionPane.INFORMATION_MESSAGE);

I get the following error message

Code:

----jGRASP exec: appletviewer jgrasphta.htm

Exception in thread "AWT-EventQueue-1" java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent
    at javax.swing.JOptionPane.createInternalFrame(JOptionPane.java:1486)
    at javax.swing.JOptionPane.showInternalOptionDialog(JOptionPane.java:1259)
    at javax.swing.JOptionPane.showInternalMessageDialog(JOptionPane.java:1073)
    at javax.swing.JOptionPane.showInternalMessageDialog(JOptionPane.java:1047)
    at DrawingPanel.paintComponent(DrawingPanel.java:67)
    at javax.swing.JComponent.paint(JComponent.java:1027)
    at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)
    at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:277)
    at javax.swing.RepaintManager.paint(RepaintManager.java:1217)
    at javax.swing.JComponent._paintImmediately(JComponent.java:5070)
    at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803)
    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
    at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
    at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

----

I am not really sure if that helps any.

 

The showInternalMessageDialog needs a parentFrame rather than null as a first parameter. Pass it your JFrame or, if you have multiple ones, the one on which coordinates the Message Dialog's position should be based on.

 

Will this work for the "JOptionPane.showMessageDialog" as well?

 

The showMessageDialog shouldn't need a specific parent frame, only the ones with 'Internal' in the name. If it did, it would throw the same exception.

Does the program freeze before or after this line? Maybe the error is before or after it. What text does the pop up display? Also, are there any error messages on the console?

 

I forgot to say this, but thanks for your help World.

---

The entire code can be found here

http://forums.devarticles.com/java-development-38/freeze-on-running-194870.html

I'll post the problem area here.

Code:

*snip*
}
if (checkBoxArray[2].isSelected())
{
//Entrance Perpendicular

JOptionPane.showMessageDialog(null, "Entrance Perpendicular: Dr. S can input what he wants here ",
"Entrance Perpendicular",
JOptionPane.INFORMATION_MESSAGE);

//TOP
g.setColor(Color.BLACK);
g.drawLine(325, 193, 335, 208);
//Middle
g.drawLine(325,250,335, 250);
//BOTTOM
g.drawLine(325, 305, 335, 295);

}
*snip*

The program will run and I can check all of the check boxes until the I get to the one with the JOptionPane in it. It is more like it has gotten caught in an infinite loop or something. Except, I don't have 50 million popping up at once.

I'll try to get some screens of the error code up in a minute.

*edit*
I am getting the following error code:

*another edit*
I was wrong about the 50 million pop ups

Also, starting at

at java.security.AccessController.doPrivileged(Native Method)

it keeps repeating

Code:

	at java.awt.Dialog.show(Dialog.java:1101)
	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:853)
	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:650)
	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:621)
	at DrawingPanel.paintComponent(DrawingPanel.java:67)
	at javax.swing.JComponent.paint(JComponent.java:1027)
	at javax.swing.JComponent.paintChildren(JComponent.java:864)
	at javax.swing.JComponent.paint(JComponent.java:1036)
	at javax.swing.JComponent.paintChildren(JComponent.java:864)
	at javax.swing.JComponent.paint(JComponent.java:1036)
	at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
	at javax.swing.JComponent.paintChildren(JComponent.java:864)
	at javax.swing.JComponent.paint(JComponent.java:1036)
	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
	at java.awt.Container.paint(Container.java:1780)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
	at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
	at java.awt.Dialog$1.run(Dialog.java:1051)
	at java.awt.Dialog$3.run(Dialog.java:1103)

 

Hm, I'm afraid I can't help you there. Applets aren't my cup of tea, haven't used them in years. What I was able to find out by trying that code was that while the MessageDialog isn't drawn, you can still click on the invisible OK-Button (or hit enter or space).

I can tell you though that the MessageDialog would be called whenever you change something as long as the corresponding checkbox was ticked since that part of the paintComponent method would be called every time.

This shows itself especially if you don't use HTML as an applet viewer. If I try to resize the Applet Viewer Window with the option checked, I get a StackOverflow from the many MessageDialogs that pop up.

In short, I have no idea how the OptionPanes work in Applets.
All I can recommend is not using an OptionPane and painting a custom message box over the paint area and put the program to sleep for a few seconds. Or maybe draw a String with the message somewhere.

 

g.drawString seems to be working at the moment

Thanks again for your help, World