Event Dispatch n Listen between module
hello.
i gonna develope a App using module based env.
but, i don't know hot to do.
so, hope someone let me the way with samples.
here is my ideal structrue.
When i click a node in Tree [module A],
i want to send some data value to [module B] by event
dispatching.
[main App module]
- [sub module]
- [Display module A] : left side, Tree Type
- [Display module B] : right side,
AdvancedDataGrid
You need to create a singleton object for main application
for listening events and redirection them to modules. (In Caingorm
microarchitecture it's called MainController)
In each module it's needed an initial part for registering
posible events in MainController and event listeners for events
from other modules.
Similar Messages
-
Dispatching and listening events in different swf in flex
I have two swf files.
1.Main Application swf file.
2.Module swf file
If i dispatch an event in main application swf file i am unable to listen in module swf file.
Can any one propose me a solution for this.You can use this example:
private function ready(event:ModuleEvent):void
var c:UIComponent = event.currentTarget.child as UIComponent;
c.addEventListener(events.system_events.MODULE_UPDATED, updated, false, 0, true);
<mx:ModuleLoader id="mod" x="0" y="0" ready="ready(event);" error="load_error(event);" width="100%" height="100%" /> -
I need to make a task with less as3 code and more timeline structure and event dispatcher !
I went to an interview in a big company. I had to make a task in which there is a wall with 3 lines and 5 columns filled with bombs.When you click on a bomb the bomb changes its scale, a robot enters, goes under the bomb and takes it, then goes to a smaller wall, makes the bomb smaller and place it at the same place it had been in the previous wall.I made the task with tween througout as3 code.The interviewer told me it was good but i need to make it with the less code possible and with more complex timeline structure and to use event dispatcher.What is the best way to do this ?
The immediate thing that comes to mind is they might want to see that you can balance work between design teams and development teams.
To do that, the robots movements (pick up bomb, bomb grows/shrinks, arms/treads/legs moving, sequences of 'doing things') can be timeline based so animators can work on those separate from code.
Developers would be working on the logic of keeping score, moving the robot around to the correct spot with path detection, collision detection, etc.
It's very similar to thinking in simple factories (which Flash is good at being automatically with timelines), and a bit of MVC (or just VC in some cases).
Big companies have lots of different types of employees so you'll probably be very specific in your role so you're efficient. -
[svn:fx-trunk] 12435: Followup to the recent event dispatching change.
Revision: 12435
Revision: 12435
Author: [email protected]
Date: 2009-12-03 07:26:54 -0800 (Thu, 03 Dec 2009)
Log Message:
Followup to the recent event dispatching change. As it turns out we do require capture phase listeners on both FlexEvent.MOVE and FlexEvent.RESIZE. Will make the change to always dispatch these event types but if it proves too much of a performance loss (as measured by our performance suite), we will find a way to work around the need for capturing. Currently UIComponent listens for MOVE,RESIZE that it may update the focus rectangle. DataGrid listens for RESIZE globally to dismiss any active item renderers.
QE notes: None
Doc notes: None
Bugs: SDK-24504
Reviewer: Alex
Tests run: Checkin
Is noteworthy for integration: No
Ticket Links:
http://bugs.adobe.com/jira/browse/SDK-24504
Modified Paths:
flex/sdk/trunk/frameworks/projects/framework/src/mx/core/UIComponent.as -
How to synchronize two Event Dispatcher threads?
I have two applications running in the same jvm. The flow should go like--
a) First application (A1) has a swing window containing componets like buttons, text boxes etc.
b) On click of this button, Event Dispatcher thread (T1) , calls the other application (A2).
c) The second application A2, creates a swing window using EventQueue.invokeLater method and in the mean time Thread T1 should wait for this new A2 window to get some results from the database.
Is it possible to stop thead T1 in between without freezing the GUI components of application A2.
ThanksI think what tjacobs01 is getting at, is that there is only one Event Dispatcher Thread per JVM. So your question does not make sense. If there really is two EDT threads, then you are dealing with inter-process communication (since there would be two JVM processes, one for each application).
It sounds like there is only one JVM, one EDT and two instances of a java.awt.Window. You probably think of the window == an application. In that case, you can probably solve your problem by executing the DB access (the long-running task) in the doInBackground() method of a SwingWorker.
http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html -
Eventhandlers of children of application can not receive custom event dispatched by application
Hello dear Adobe community,
hope you can help me with this issue.
When the application dispatches a custom event, the child uicomponent can only receive the event by using Application.application.addEventListener or systemManager.addEventListener. Simply adding a listener, without application or systemmanager, does not allow the event to be received by the child component.
I want to be able to use the addEventListener and removeEventListener without SystemManager or Application.application, or could you provide a better workaround? How can I use the addEventListener, do I need to overwrite EventDispatcher, which I wouldnt like to do?
Just to clarifiy, if i remove the systemManager in front of addEventListener(CustomEventOne.EventOne,sysManHandleCE,false) it will not add it and will not fire.
The code below is an example for this problem that the event is not getting fired in the right moment. The mainapplication got only a button with the customEventOne that gets dispatched.
public
class MyCanvas extends Canvas{
public function MyCanvas()
super();
width=300;
height=300;
addEventListener(FlexEvent.CREATION_COMPLETE,handleCC,false,0,true);
private function handleCC(event:FlexEvent):void
removeEventListener(FlexEvent.CREATION_COMPLETE,handleCC);
addEventListener(CustomEventOne.EventOne,handleCE,false,0,true);
addEventListener(Event.REMOVED_FROM_STAGE,handleEvt,false,0,true);
systemManager.addeventListener(CustomEventOne.eventOne,sysManHandleCE,false,0,true);
private function handleEvt(event:Event):void
trace("In removed from stage handler");
systemManager.removeEventListener(CustomEventOne.EventOne,sysManHandleCE);
trace(hasEventListener(FlexEvent.CREATION_COMPLETE));
trace(hasEventListener(CustomEventOne.EventOne));
trace(hasEventListener(Event.REMOVED_FROM_STAGE));
private function handleCE(event:CustomEventOne):void
trace("I got it");
private function sysManHandleCE(event:CustomEventOne):void
trace("I got it");
public class CustomEventOne extends Event
public static const EventOne:String = "EventOne";
public function CustomEventOne(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
super(type, bubbles, cancelable);
override public functionclone():Event
return newCustomEventOne(type,bubbles,cancelable);
Thank you in advance,
MichaelI think you need to look at event propogation. The object that dispatches an event will be sitting on the display tree. The event propagates up the tree to the roots. Your canvas should be attached to the application, but even then it sits lower in the tree branches than the event dispatcher, so it won't see the event being dispatched because the event is not propagated to the children of the object that dispatches it but to the parent of the object that dispatches it.
So, your canvas is a child of the application, but dispatching the event from the application means that the canvas doesn't see it because events are notified up the tree using the parent link, not the child links.
You may wish to investigate how the display list and event propagation works and then the MVC pattern.
Paul -
Executing Code outside of the Event Dispatcher Thread
Hello,
I have just come to learn that any actionPerformed() method that is called after an event occurs actually runs in the Event Dispatcher. So, for example, if you click on a button, any code that is run as a result is run in the event dispatcher.
So there are two things I am wondering about. First, If i run code in response to a user event, then it doesn't have to use invokeLater() to update GUI components because it's already being run in the event thread? Second, if I run code in response to an event but it's computationally expensive and I do not want to run it in the Event Dispatcher thread, how do i do that? Will a method call cause it to do so, or do i have to specifically create a new thread for it?
My questions are a result of this: How does one normally go about updating a GUI during a long process? I figured that if I could get the process to run in any thread other than the Event Dispatcher, I could call invokeLater() within it and it would update the GUI. Am I correct in assuming so?So there are two things I am wondering about. First, If i run code in response to a user event, then it doesn't have to use invokeLater() to update GUI components because it's already being run in the event thread?
Correct. So if your response to an action is, for example, creating a new bit of UI using data which is already in memory, you can just do it.
Second, if I run code in response to an event but it's computationally expensive and I do not want to run it in the Event Dispatcher thread, how do i do that? Will a method call cause it to do so, or do i have to specifically create a new thread for it?
You will need to create a new thread: method calls are just control flow within the same thread.
You should use an object which implements Runnable and then use "new Thread(foo).start()"
My questions are a result of this: How does one normally go about updating a GUI during a long process?
You have to hop back onto the EDT whenever an update is required. I'd suggest writing yourself a little reusable class or two to help you with this - such as a listener mechanism with an implementation which handles the thread hopping.
I figured that if I could get the process to run in any thread other than the Event Dispatcher, I could call invokeLater() within it and it would update the GUI. Am I correct in assuming so?
Yes.
Should I use inner classes? I would prefer to keep them as separate classes within the same package.
Depends on all sorts of things - sometimes anonymous or declared inner objects are the way forward, sometimes public class objects, sometimes generic helper objects and sometimes utility classes. There are all sorts of different scenarios. As I say, though, it's worth writing some utility/helper classes to reuse. Personally I don't find SwingWorker is ideal so I have my own. Note that an abstract Action implementation is a very useful one, since this is precisely where you need to be doing most of the thread hopping. -
Event dispatching to swing components
Hi,
I'm implementing an extension of JTextPane, and I would like to make it as much reusable as possible.
In order to do this, the class don't have to know about the external world (components)..
The class should notify events (e.g. an event could be that a specific string has been typed..) to the other components just sending a message (or event), and all the components registered to that specific event implement their behavior to react to it.. quite simple..
which is the simplest solution in Java to do this?
thanks in advance..You should implement event dispatching based on the listener model, for consistency. Since you are extending JTextPane, a lot of the event dispatching code is written for you. Look up JTextPane in the javadocs and check out all the classes it is derived from. To take advantage of the already written listener code, simply call the appropriate fireWhateverEvent method whenever something happens. That will cause the event to be dispatched to all listeners registered with that component. If you want to define some new events that aren't covered by any of the listener methods in any of the classes your new class is derived from, here's the general way to do it:
1) Define a new listener interface that implements the EventListener interface (which contains no methods).
2) In your new listener interface, include methods for specific events, such as keyPressed, actionPerformed, textTyped, etc...
3) Each of these methods should take a single parameter describing the event. This parameter should be a class that extends EventObject and that contains data relevant to your event. For example, you may define a TextEvent class that extends EventObject. The only methods EventObject has is getSource() and toString(). You won't really need to override these as long as you call the EventObject(Object) constructor from your TextEvent constructors.
4) In your JTextPane derived class, define methods that can add, remove, and get a list of all registered event listeners for your event (ex: void addTextListener(TextListener t), void removeTextListener(TextListener t), TextListener[] getTextListeners()).
5) add*Listener should add the listener to an internal list of listeners (a LinkedList or a Vector are good ways to store the registered listener lists). remove*Listener should remove the listener from the list, and get*Listeners should return the list in array form.
6) For ease-of-use, define a fire method like fireTextListener(params), which creates a new TextEvent (assuming you're doing the TextListener thing) holding the specified event data and iterates through the internal list of listeners, calling the appropriate method in each one and passing your TextEvent to it.
7) Call your fire*Event functions wherever appropriate to fire events.
It's simpler than it sounds. Here's a small example:
// TextListener.java
public class TextListener implements EventListener {
public void textInserted (TextEvent e);
public void textDeleted (TextEvent e);
// TextEvent.java
public class TextEvent extends EventObject {
protected int pos0;
protected int pos1;
protected String text;
public TextEvent (Object source, int pos0, int pos1, String text) {
super(source);
this.pos0 = pos0;
this.pos1 = pos1;
this.text = (text != null) ? text : "";
public TextEvent (Object source, int pos0, int pos1) {
this(source, pos0, pos1, null);
public int getPos0 () {
return pos0;
public int getPos1 () {
return pos1;
public String getText () {
return text;
// MyTextPane.java
public class MyTextPane extends JTextPane {
LinkedList textListeners = new LinkedList();
// This is just some method you defined, can be anything.
public void someMethodThatInsertsText () {
fireTextInserted(pos0, pos1, textInserted);
// Same with this, this can be anything.
public void someOtherMethodThatDeletesText () {
fireTextDeleted(pos0, pos1);
public void addTextListener (TextListener t) {
textListeners.add(t);
public void removeTextListener (TextListener t) {
textListeners.remove(t);
public TextListener[] getTextListeners () {
TextListener ts = new TextListener[textListeners.size()];
Iterator i;
int j;
// Don't think toArray works good because I'm 99% sure you'll
// have trouble casting an Object[] to a TextListener[].
for (j = 0, i = textListeners.iterator(); i.hasNext(); j ++)
ts[j] = (TextListener)i.next();
protected fireTextInserted (int pos0, int pos1, String text) {
TextEvent e = new TextEvent(this, pos0, pos1, text);
Iterator i = textListeners.iterator();
while (i.hasNext())
((TextListener)i.next()).textInserted(e);
protected void fireTextDeleted (int pos0, int pos1) {
TextEvent e = new TextEvent(this, pos0, pos1);
Iterator i = textListeners.iterator();
while (i.hasNext())
((TextListener)i.next()).textDeleted(e);
};There. I just typed that there, didn't test or compile it, but you get the gist of it. Then, like you do with any listener stuff, when you want to set up a listener and register it with a MyTextPane instance, just create some class that extends TextListener and overrides textInserted and textDeleted to do whatever your application needs to do.
Hope that makes sense.
Jason -
Not Running on the Event Dispatch thread, but UI still freezes
The environment: I am currently working on an application that requires some heavy lifting in response to user input on a UI. To do this I am using a version of SwingWorker that was backported from java 1.6 to java 1.5 in conjunction with a slew of custom threads.
The problem: I am currently running into an issue where I am not operating on the Event Dispatch thread (checked by doing a javax.swing.SwingUtilities.isEventDispatchThread()) but the UI is still freezing during this section. The operation involves a loop with about 2000 iterations and contains several file accesses. I have thought about how to make a new thread to perform the same operation, but I do not see how it would be any different since as it is I am not on the EDT. The call is being made from doInBackground and specifically the piece that is slowing things down is the File Accesses (2 for every iteration of the loop). At this point I am not sure how to go about resolving the issue. Any one have any suggestions?I am not operating on the Event Dispatch threadThat is the problem. Use multiple threads for GUI, which should delegates to the EDT, and your app logic.
-
Event Dispatch Thread Hangs, what is wrong?
The Event Dispatch Thread Hangs when showing a modal dialog while running a
SwingWorker Thread.
I have included my code at the bottom of the page. There are three classes. I have posted a bug report to red hat. But I want to make sure my code is correct.
My test case just puts the SwingWorker to sleep
but the problem occurs if I do something real, like connect to a database, etc.
Also I have tried little different variations of the logic calling
setVisible(true)/(false) in different places and the same problem occurs.
It seems to work with Sun JDK, note I am using IcedTea with Fedora Core 8.
Version-Release number of selected component (if applicable):
[szakrews@tuxtel ~]$ java -version
java version "1.7.0"
IcedTea Runtime Environment (build 1.7.0-b21)
IcedTea Client VM (build 1.7.0-b21, mixed mode)How reproducible:
Every couple times.
javac TestClass2
java TestClass2eventually it will hang. If it doesn't try again.
You don't have to wait for the program to finish either.
The program runs the Dialog 10 times but it never works or fails in the middle, it will either work or fail from the first dialog displayed.
I have included a thread dump. That is about the most informative information I can get. Neither tracing nor writing a custom ThreadQueue or Drawing Manager to trace events produces any helpful information.
Actual results:
The JProccessBar won't move, and the SwingWorker finishes but the done() method is never run. The PROGRAM is not hung however because if I close the dialog then it will continue.
Expected results:
The JProccessBar should always move and the SwingWorker should always run the done() method.
Additional info:
java thread dump after freeze, taken with kill -s SIGQUIT <pid>
2008-06-25 12:25:50
Full thread dump IcedTea Client VM (1.7.0-b21 mixed mode):
"DestroyJavaVM" prio=10 tid=0x938afc00 nid=0x1419 waiting on condition
[0x00000000..0x0018a074]
java.lang.Thread.State: RUNNABLE
"AWT-EventQueue-0" prio=10 tid=0x938ae400 nid=0x1429 in Object.wait()
[0x07f96000..0x07f96f04]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x96748f80> (a java.awt.EventQueue)
at java.lang.Object.wait(Object.java:503)
at java.awt.EventQueue.getNextEvent(EventQueue.java:485)
- locked <0x96748f80> (a java.awt.EventQueue)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:248)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:201)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:195)
at java.awt.Dialog$1.run(Dialog.java:1073)
at java.awt.Dialog$3.run(Dialog.java:1127)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1125)
at java.awt.Component.show(Component.java:1456)
at java.awt.Component.setVisible(Component.java:1408)
at java.awt.Window.setVisible(Window.java:871)
at java.awt.Dialog.setVisible(Dialog.java:1012)
at net.xtel.production.WaitDialog.showWaitDialog(WaitDialog.java:72)
at net.xtel.production.WaitDialog.showWaitDialog(WaitDialog.java:102)
at TestClass2.showWait(TestClass2.java:79)
at TestClass2.createAndShowGUI(TestClass2.java:126)
at TestClass2.access$0(TestClass2.java:114)
at TestClass2$3.run(TestClass2.java:138)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:227)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:603)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:276)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:201)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:191)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:186)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:139)
"AWT-Shutdown" prio=10 tid=0x938ad000 nid=0x1428 in Object.wait()
[0x03ea7000..0x03ea7f84]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x96749268> (a java.lang.Object)
at java.lang.Object.wait(Object.java:503)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:281)
- locked <0x96749268> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:675)
"AWT-XAWT" daemon prio=10 tid=0x938a8400 nid=0x1423 runnable
[0x02ccc000..0x02ccd104]
java.lang.Thread.State: RUNNABLE
at sun.awt.X11.XToolkit.waitForEvents(Native Method)
at sun.awt.X11.XToolkit.run(XToolkit.java:550)
at sun.awt.X11.XToolkit.run(XToolkit.java:525)
at java.lang.Thread.run(Thread.java:675)
"Java2D Disposer" daemon prio=10 tid=0x93854000 nid=0x1421 in Object.wait()
[0x07aea000..0x07aead84]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x966e7010> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
- locked <0x966e7010> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:150)
at sun.java2d.Disposer.run(Disposer.java:143)
at java.lang.Thread.run(Thread.java:675)
"Low Memory Detector" daemon prio=10 tid=0x93c15000 nid=0x141f runnable
[0x00000000..0x00000000]
java.lang.Thread.State: RUNNABLE
"CompilerThread0" daemon prio=10 tid=0x93c13400 nid=0x141e waiting on condition
[0x00000000..0x03a8a954]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x93c11c00 nid=0x141d waiting on
condition [0x00000000..0x00000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=10 tid=0x095e7000 nid=0x141c in Object.wait()
[0x005d2000..0x005d3004]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x966e71d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
- locked <0x966e71d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:150)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:177)
"Reference Handler" daemon prio=10 tid=0x095e2400 nid=0x141b in Object.wait()
[0x00581000..0x00582084]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x966e7260> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:503)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:134)
- locked <0x966e7260> (a java.lang.ref.Reference$Lock)
"VM Thread" prio=10 tid=0x095dec00 nid=0x141a runnable
"VM Periodic Task Thread" prio=10 tid=0x93c17400 nid=0x1420 waiting on condition
JNI global references: 836
Heap
def new generation total 960K, used 152K [0x93f40000, 0x94040000, 0x966a0000)
eden space 896K, 9% used [0x93f40000, 0x93f56148, 0x94020000)
from space 64K, 100% used [0x94020000, 0x94030000, 0x94030000)
to space 64K, 0% used [0x94030000, 0x94030000, 0x94040000)
tenured generation total 4096K, used 1088K [0x966a0000, 0x96aa0000, 0xb3f40000)
the space 4096K, 26% used [0x966a0000, 0x967b01b0, 0x967b0200, 0x96aa0000)
compacting perm gen total 12288K, used 9169K [0xb3f40000, 0xb4b40000, 0xb7f40000)
the space 12288K, 74% used [0xb3f40000, 0xb4834740, 0xb4834800, 0xb4b40000)
No shared spaces configured.CLASS1:
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.SQLException;
import java.util.concurrent.ExecutionException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.RepaintManager;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestClass2 extends JFrame implements ActionListener {
/** Action Command for <code>searchbtn</code> */
public static final String SEARCH_BTN_ACTION = "search_btn_action";
* Constructor.
public TestClass2() {
setSize(650, 350);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setLocation(screenSize.width / 2 - getSize().width / 2,
screenSize.height / 2 - getSize().height / 2);
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
exit();
JPanel panel = new JPanel();
add(panel);
setVisible(true);
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals(SEARCH_BTN_ACTION)) {
JOptionPane.showMessageDialog(this, "Button Pressed");
public void showWait() {
try {
WaitDialog.showWaitDialog(this, "Testing...", new SwingWorkerInterface(){
@Override
public Object workToDo() throws Throwable {
Thread.currentThread().sleep(3000);
return null;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
* Exits the program.
public void exit(){
System.exit(0);
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
* @throws UnsupportedLookAndFeelException
* @throws IllegalAccessException
* @throws InstantiationException
* @throws ClassNotFoundException
* @throws NullInstanceVariableException
* @throws SQLException
private static void createAndShowGUI() {
// set look and feel
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// Create instance of the ProductCatalog
TestClass2 root = new TestClass2();
for(int i = 0; i < 10; i++){
root.showWait();
}catch(Exception e){
e.printStackTrace();
* @param args
* this program does not use arguments
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}CLASS 2:
import java.awt.Component;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.concurrent.ExecutionException;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
public class WaitDialog extends JDialog {
private boolean disposed = false;
private boolean displayed = false;
private WorkerThread worker = null;
WaitDialog(Frame parent, String text, SwingWorkerInterface in){
super(parent, true);
worker = new WorkerThread(in);
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
worker.execute();
@Override
public void windowClosing(WindowEvent e) {
disposeWaitDialog();
this.setResizable(false);
JLabel message = new JLabel();
message.setText(text);
JProgressBar pb = new JProgressBar();
pb.setIndeterminate(true);
// set size and location
setSize(200, 100);
setLocationRelativeTo(parent);
JPanel panel = new JPanel();
panel.add(message);
panel.add(pb);
add(panel);
public void showWaitDialog(){
if(displayed == true){
return;
if(disposed == true){
disposed = false;
return;
disposed = false;
displayed = true;
setVisible(true);
public void disposeWaitDialog(){
if(disposed == true){
return;
if(displayed == true){
displayed = false;
setVisible(false);
return;
disposed = true;
displayed = false;
public static Object showWaitDialog(Component parent, String text, SwingWorkerInterface in) throws InterruptedException, ExecutionException {
WaitDialog waitDialog = null;
if (parent == null) {
waitDialog = new WaitDialog(JOptionPane.getRootFrame(), text, in);
} else {
waitDialog = new WaitDialog(JOptionPane.getFrameForComponent(parent), text, in);
while(!waitDialog.worker.isDone()){
System.out.println("about to show");
waitDialog.showWaitDialog();
System.out.println("done showing");
waitDialog.dispose();
return waitDialog.worker.get();
class WorkerThread extends SwingWorker<Throwable, Void> {
private SwingWorkerInterface in = null;
WorkerThread(SwingWorkerInterface in){
this.in = in;
public Throwable doInBackground(){
try {
System.out.println("about to do work");
in.workToDo();
System.out.println("done work no exception");
} catch (Throwable e) {
System.out.println("done work with exception");
return e;
return null;
public void done(){
System.out.println("about to dispose");
disposeWaitDialog();
System.out.println("disposed");
}CLASS 3:
public interface SwingWorkerInterface {
public Object workToDo() throws Throwable;
}There's nothing directly wrong with it, but it will
prevent other threads acquiring the class lock - but
that may be what you want.True. Although the typical case for code that looks like this would be to use wait--usually the various threads in question require the same lock, so you have to use wait in order for the waiting thread to give it up and allow the other thread to do its work. Hard to say for sure though what he's doing.
Also, if loading is all that the other thread does, and you're waiting for that thread to die, use join. But then, if that's the case, and you're only waiting for a single other thread, then you might as well just put it all in one thread, as already indicated. -
Information Regarding :Exception occurred during event dispatching
Hi,
I frequently get this exception when I click a button in a dialog and it opens up another frame of window. The exception trace includes java internal classes and my program classes line numbers. I have searched the net but could not get any concrete answer.
Is this problem in java packages or should we take care of something in our code to avoid such exceptions.
Below is the exception trace..........................
Exception occurred during event dispatching:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1141)
at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)
at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
at javax.swing.JComponent.paintComponent(JComponent.java:541)
at javax.swing.JComponent.paint(JComponent.java:808)
at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4795)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)
at javax.swing.JComponent._paintImmediately(JComponent.java:4692)
at javax.swing.JComponent.paintImmediately(JComponent.java:4495)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:409)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
at java.awt.Dialog$1.run(Dialog.java:540)
at java.awt.Dialog.show(Dialog.java:561)
at java.awt.Component.show(Component.java:1192)
at java.awt.Component.setVisible(Component.java:1147)
at com.mycomp.example.DialogView.showWindow(DialogView.java:91)
at com.mycomp.example.showWindow(StatusController.java:83)
at com.mycomp.example.handleOk(ExampleController.java:842)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5159)
at java.awt.Component.processEvent(Component.java:4956)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3674)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
Thanks in advance.Hi All,
Thanks for the replies and information posted by you.
Below is some code snippet: ( complete code posting is difficult) ;-)
Dialog1 is open, clicking on button say start it hides the current Dialog1 and opens the status dialog for Dialog1.
Also, we are making the current Thread to sleep to avoid flickering.
dialog1.hideWindow(); // Hide current window...
Thread.currentThread().sleep(5); // sleep to avoid flickering..
statusDialog.showWindow(); // to display status window..
I will check and try to do modifications as per your suggestions.
Thanks. -
JFileChooser : Exception occurred during event dispatching
Hi,
I'm having problems with sorting in 'Details' view of JFileChooser. I'm getting the following NullPointerException when I try to sort by clicking on the header of the JTable which I get in 'Details' view of a JFileChooser.
Exception occurred during event dispatching:
java.lang.NullPointerException
at java.awt.EventQueue.isDispatchThread(Unknown Source)
at javax.swing.SwingUtilities.isEventDispatchThread(Unknown Source)
at javax.swing.JComponent.revalidate(Unknown Source)
at javax.swing.JTable.resizeAndRepaint(Unknown Source)
at javax.swing.JTable.sortedTableChanged(Unknown Source)
at javax.swing.JTable.sorterChanged(Unknown Source)
at javax.swing.RowSorter.fireRowSorterChanged(Unknown Source)
at javax.swing.RowSorter.fireRowSorterChanged(Unknown Source)
at javax.swing.DefaultRowSorter.sort(Unknown Source)
at sun.swing.FilePane$DetailsTableRowSorter.access$1301(Unknown Source)
at sun.swing.FilePane$DetailsTableRowSorter$1.call(Unknown Source)
at sun.swing.FilePane$DetailsTableRowSorter$1.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Any operation performed in the JFileChooser after this exception will generate the same exception & no action is performed. I'm using Java 1.6.0_24. Strangely, this is happening only in client-server mode. Staand-alone is working fine.
Please provide some urgent inputs to this problem
Thanks
DilipThanks 4 d reply mKorbel, I'm not creating a TableModel. I'm just creating a JFileChooser as shown below.
JFileChooser fileChooser = new JFileChooser(location);
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
fileChooser.setMultiSelectionEnabled(false);
fileChooser.setDialogTitle("Choose File");
if (fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
Now, the scenario is to bringup the FileChooser, go to Details view, apply sort on any column. This action creates the mentioned NullPointerException. -
JTabbedPane: Exception occurred during event dispatching:
Hi,
I have a JTabbedPane where the tabs can be added dynamically by the method:
private void addNewTab(JTable aTable) throws java.lang.NullPointerException
final JTable t = aTable;
Thread addTab = new Thread()
public void run()
JScrollPane scroller = new JScrollPane();
JTable table;
if (t==null)
table = new JTable(columns, 0);
else
table = t;
table.setColumnsEditable(colEditable);
cachedTables.addElement(table);
scroller.getViewport().setView(table);
jtp.insertTab("Tab " + cachedTables.size(), null, scroller, "Tab", cachedTables.size()-1);
jtp.updateUI();
SwingUtilities.invokeLater(new Runnable()
public void run()
jtp.setSelectedIndex(cachedTables.size()-1);
jtp.validate();
addTab.start();
The problem is that occasionally (20% of the times) I receive this exception:
Exception occurred during event dispatching:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTabbedPaneUI.rotateInsets(BasicTabbedPaneUI.java:1159)
at javax.swing.plaf.basic.BasicTabbedPaneUI.getTabAreaInsets(BasicTabbedPaneUI.java:951)
at javax.swing.plaf.basic.BasicTabbedPaneUI.calculateTabAreaHeight(BasicTabbedPaneUI.java:924)
at javax.swing.plaf.basic.BasicTabbedPaneUI.paintContentBorder(BasicTabbedPaneUI.java:637)
at javax.swing.plaf.basic.BasicTabbedPaneUI.paint(BasicTabbedPaneUI.java:358)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:39)
at javax.swing.JComponent.paintComponent(JComponent.java:395)
at javax.swing.JComponent.paint(JComponent.java:687)
at javax.swing.JComponent.paintChildren(JComponent.java:498)
at javax.swing.JComponent.paint(JComponent.java:696)
at javax.swing.JComponent.paintWithBuffer(JComponent.java:3878)
at javax.swing.JComponent._paintImmediately(JComponent.java:3821)
at javax.swing.JComponent.paintImmediately(JComponent.java:3672)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:370)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:124)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
Does none know, how I can solve the problem?
Thanks,
Diego.Fix the NullPointerException. The stack trace tells you the line that caused the problem.
-
Exception occurred during event dispatching
I'm facing a problem with dispatchCustomEvent() method while clicking a button on oracle form. The code is given below:
package oracle.forms.finalbutton;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
import javax.swing.JButton;
import oracle.forms.ui.CustomEvent;
import oracle.forms.ui.VBean;
import oracle.forms.ui.VButton;
import oracle.ewt.button.PushButton;
import oracle.forms.handler.IHandler;
import oracle.forms.properties.ID;
import oracle.forms.properties.Property;
public class FinalButton extends VBean implements ActionListener
public final static ID WBP = ID.registerProperty("BUTTONPRESSED");
private IHandler m_handler;
protected JButton b1 ;
public FinalButton()
super();
b1 = new JButton("");
b1.setActionCommand("push");
b1.addActionListener(this);
add(b1) ;
public void actionPerformed(ActionEvent e) {
CustomEvent ce = new CustomEvent(m_handler, WBP);
// new URLProcess("http://rsb.info.nih.gov/ij/images/ct.dcm");
new URLProcess("http://localhost/Sunset.jpg");
dispatchCustomEvent(ce);
public void init(IHandler handler)
m_handler = handler;
super.init(handler);
The exception message thrown is given in the subject of this message. Now I need to know the details regarding event dispatching. Please someone help me.
Thanks
RashedHi
Thanks...actually I want to click a button on Oracle Form and below is the actionPerformed method code:
public void actionPerformed(ActionEvent e) {
CustomEvent ce = new CustomEvent(m_handler, WBP);
new URLProcess("http://rsb.info.nih.gov/ij/images/ct.dcm");
dispatchCustomEvent(ce);
I think my way of event dispatching isn't right. I need to instantiate an object of the class
URLProcess on click event. Could you please let me know how can I get around the problem?
Rashed -
Exception occurred during event dispatching:java.lang.NoSuchMethodError
Hello,
We have upgraded to the latest Oracle Application Server version 10.1.2.3.0 and the webutil version is 1.0.6.
But we face the following error while accessing the web link. Following message captured from Java Console.
Please suggest if you have any solutions/idea about this error. Thanks !
Oracle JInitiator: Version 1.3.1.22
Using JRE version 1.3.1.22-internal Java HotSpot(TM) Client VM
Maximum size: 50 MB
Compression level: 0----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
q: hide console
s: dump system properties
t: dump thread list
x: clear classloader cache
0-5: set trace level to <n>
Downloading http://si02938.in.irt.com:7778/forms/java/frmall_jinit.jar to JAR cacheDownloading http://si02938.in.irt.com:7778/forms/java/frmwebutil.jar to JAR cacheDownloading http://si02938.in.irt.com:7778/forms/java/jacob.jar to JAR cacheDownloading http://si02938.in.irt.com:7778/forms/java/FileInformation.jar to JAR cacheDownloading cacheproxyHost=nullproxyPort=0connectMode=HTTP, native.
Forms Applet version is : 10.1.2.3
Exception occurred during event dispatching:java.lang.NoSuchMethodError at oracle.forms.webutil.common.VBeanCommon.init(VBeanCommon.java:281) at oracle.forms.handler.UICommon.instantiate(Unknown Source) at oracle.forms.handler.UICommon.onCreate(Unknown Source) at oracle.forms.handler.JavaContainer.onCreate(Unknown Source) at oracle.forms.engine.Runform.onCreateHandler(Unknown Source) at oracle.forms.engine.Runform.processMessage(Unknown Source) at oracle.forms.engine.Runform.processSet(Unknown Source) at oracle.forms.engine.Runform.onMessageReal(Unknown Source) at oracle.forms.engine.Runform.onMessage(Unknown Source) at oracle.forms.engine.Runform.processEventEnd(Unknown Source) at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source) at oracle.ewt.lwAWT.LWComponent.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.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)
Edited by: user12233243 on Nov 16, 2009 10:28 PM
Edited by: user12233243 on Nov 16, 2009 10:29 PMhi
read the following configuration i hope it will help u.
How to get up and running with WebUtil 1.06 included with Oracle Developer Suite 10.1.2.0.2 on a win32 platform
Solution
Assuming a fresh "Complete" install of Oracle Developer Suite 10.1.2.0.2,
here are steps to get a small test form running, using WebUtil 1.06.
Note: [OraHome] is used as an alias for your real oDS ORACLE_HOME.
Feel free to copy this note to a text editor, and do a global find/replace on
[OraHome] with your actual value (no trailing slash). Then it is easy to
copy/paste actual commands to be executed from the note copy.
1) Download http://prdownloads.sourceforge.net/jacob-project/jacob_18.zip
and extract to a temporary staging area. Do not attempt to use 1.7 or 1.9.
2) Copy or move jacob.jar and jacob.dll
[JacobStage] is the folder where you extracted Jacob, and will end in ...\jacob_18
cd [JacobStage]
copy jacob.jar [OraHome]\forms\java\.
copy jacob.dll [OraHome]\forms\webutil\.
The Jacob staging area is no longer needed, and may be deleted.
3) Sign frmwebutil.jar and jacob.jar
Open a DOS command prompt.
Add [OraHome]\jdk\bin to the PATH:
set PATH=[OraHome]\jdk\bin;%PATH%
Sign the files, and check the output for success:
[OraHome]\forms\webutil\sign_webutil [OraHome]\forms\java\frmwebutil.jar
[OraHome]\forms\webutil\sign_webutil [OraHome]\forms\java\jacob.jar
4) If you already have a schema in your RDBMS which contains the WebUtil stored code,
you may skip this step. Otherwise,
Create a schema to hold the WebUtil stored code, and privileges needed to
connect and create a stored package. Schema name "WEBUTIL" is recommended
for no reason other than consistency over the user base.
Open [OraHome]\forms\create_webutil_db.sql in a text editor, and delete or comment
out the EXIT statement, to be able to see whether the objects were created witout
errors.
Start SQL*Plus as SYSTEM, and issue:
CREATE USER webutil IDENTIFIED BY [password]
DEFAULT TABLESPACE users
TEMPORARY TABLESPACE temp;
GRANT CONNECT, CREATE PROCEDURE, CREATE PUBLIC SYNONYM TO webutil;
CONNECT webutil/[password]@[connectstring]
@[OraHome]\forms\create_webutil_db.sql
-- Inspect SQL*Plus output for errors, and then
CREATE PUBLIC SYNONYM webutil_db FOR webutil.webutil_db;
Reconnect as SYSTEM, and issue:
grant execute on webutil_db to public;
5) Modify [OraHome]\forms\server\default.env, and append [OraHome]\jdk\jre\lib\rt.jar
to the CLASSPATH entry.
6) Start the OC4J instance
7) Start Forms Builder and connect to a schema in the RDBMS used in step (4).
Open webutil.pll, do a "Compile ALL" (shift-Control-K), and generate to PLX (Control-T).
It is important to generate the PLX, to avoid the FRM-40039 discussed in
Note 303682.1
If the PLX is not generated, the Webutil.pll library would have to be attached with
full path information to all forms wishing to use WebUtil. This is NOT recommended.
8) Create a new FMB.
Open webutil.olb, and Subclass (not Copy) the Webutil object to the form.
There is no need to Subclass the WebutilConfig object.
Attach the Webutil.pll Library, and remove the path.
Add an ON-LOGON trigger with the code
NULL;
to avoid having to connect to an RDBMS (optional).
Create a new button on a new canvas, with the code
show_webutil_information (TRUE);
in a WHEN-BUTTON-PRESSED trigger.
Compile the FMB to FMX, after doing a Compile-All (Shift-Control-K).
9) Under Edit->Preferences->Runtime in Forms Builder, click on "Reset to Default" if
the "Application Server URL" is empty.
Then append "?config=webutil" at the end, so you end up with a URL of the form
http://server:port/forms/frmservlet?config=webutil
10) Run your form.
If its Correct/Helpful please mark it thanks.
Sarah
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