Eclipse Community Forums: Eclipse 4 » org.eclipse.swt.SWTException: Widget is disposed

Help

Home

Home » Eclipse Projects » Eclipse 4 » org.eclipse.swt.SWTException: Widget is disposed

Show: Today's Messages :: Show Polls :: Message Navigator

org.eclipse.swt.SWTException: Widget is disposed [message #1565115]

Thu, 15 January 2015 05:14

oh taejin

Messages: 1
Registered: January 2015

Junior Member

!MESSAGE Exception while dispatching event org.osgi.service.event.Event [topic=checkListInfo/asyncEvent] to handler ~~.CheckListInfo$2@1722429d
!STACK 0
org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4397)
at org.eclipse.swt.SWT.error(SWT.java:4312)
at org.eclipse.swt.SWT.error(SWT.java:4283)
at org.eclipse.swt.widgets.Widget.error(Widget.java:472)
at org.eclipse.swt.widgets.Widget.getDisplay(Widget.java:586)
at ~~.CheckListInfo$2.handleEvent(CheckListInfo.java:98)
at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)

A view

BundleContext ctx = FrameworkUtil.getBundle(A.class).getBundleContext();
EventHandler handler = new EventHandler() {
public void handleEvent(final Event event) {
if(parent.getDisplay().getThread() == Thread.currentThread() ) {
}else {
parent.getDisplay().syncExec(new Runnable() {
public void run() {
title_txt.setText(event.getProperty("name").toString());
command_txt.setText(event.getProperty("addr").toString());
}
});
}
}
};
Dictionary<String,String> properties = new Hashtable<String, String>();
properties.put(EventConstants.EVENT_TOPIC, "checkListInfo/*");
ctx.registerService(EventHandler.class, handler, properties);

B view

BundleContext ctx = FrameworkUtil.getBundle(B.class).getBundleContext();
ServiceReference<EventAdmin> ref = ctx.getServiceReference(EventAdmin.class);
EventAdmin eventAdmin = ctx.getService(ref);
Event event = new Event("checkListInfo/a", map);
eventAdmin.postEvent(event);

Report message to a moderator

Re: org.eclipse.swt.SWTException: Widget is disposed [message #1567858 is a reply to message #1565115]

Fri, 16 January 2015 16:15

Aurélien Pupier

Messages: 637
Registered: July 2009
Location: Grenoble, FRANCE

Senior Member

Hi,

when you access SWT Widget, it might be useful to call Widget.isDisposed()

Please provide more details and a specific question if you want more information.

Regards,

Aurélien Pupier - Red Hat
Senior Software Engineer in Fuse Tooling team

Report message to a moderator

Re: org.eclipse.swt.SWTException: Widget is disposed [message #1707199 is a reply to message #1567858]

Thu, 03 September 2015 05:43

Laszlo Orban

Messages: 5
Registered: June 2015

Junior Member

Hello there!

I just found this old thread and it seems I have the same problem.

What I want to do:
Pass information from one viewpart to another viewpart.

How I do this:
Using osgi evethandler services.

In the sender viewpart I post an event with an attached object like this:

BundleContext ctx = FrameworkUtil.getBundle(ViewLogging.class).getBundleContext();
ServiceReference<EventAdmin> ref = ctx.getServiceReference(EventAdmin.class);
EventAdmin eventAdmin = ctx.getService(ref);
Map<String,Object> properties = new HashMap<String, Object>();
properties.put("ENTRY", msg);
Event event = new Event(ViewTasks.EVENT_TOPIC_JUMP_TO_FNC_IN_TASK_TREE, properties);
eventAdmin.postEvent(event);

In the receiver viepart I create an event handler and subscribe to this event. I'm doing this in the receiver viewpart's createPartControl method.

BundleContext ctx = FrameworkUtil.getBundle(ViewTasks.class).getBundleContext();
EventHandler handler = new EventHandler() {
	public void handleEvent(final Event event) {
		parent.getDisplay().syncExec(new Runnable() {
			public void run() {
				Message msg = (Message)event.getProperty("ENTRY");
				selectTaskFromTree(msg);
			}
		});
	}
};

Dictionary<String,String> properties = new Hashtable<String, String>();
properties.put(EventConstants.EVENT_TOPIC, EVENT_TOPIC_JUMP_TO_FNC_IN_TASK_TREE);
ctx.registerService(EventHandler.class, handler, properties);

Problem:
The problem occurs when the receiver viewpart is not visible. In this case just before I post the event, I call the following:

PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().showView(ViewTasks.ID);

It opens the viewpart and it seems everything is working fine, but I still get the following exception in this case:

org.eclipse.swt.SWTException: Widget is disposed
	at org.eclipse.swt.SWT.error(SWT.java:4397)
	at org.eclipse.swt.SWT.error(SWT.java:4312)
	at org.eclipse.swt.SWT.error(SWT.java:4283)
	at org.eclipse.swt.widgets.Widget.error(Widget.java:472)
	at org.eclipse.swt.widgets.Widget.getDisplay(Widget.java:586)
	at castle.testenv.ViewTasks$4.handleEvent(ViewTasks.java:281)

The exception is raised by the parent.getDisplay() call in the eventHandler.

Can anyone tell me how to to this right? How to avoid this SWTException?

Report message to a moderator

Re: org.eclipse.swt.SWTException: Widget is disposed [message #1707209 is a reply to message #1707199]

Thu, 03 September 2015 06:31

Laszlo Orban

Messages: 5
Registered: June 2015

Junior Member

Ok, the above suggestion solved the problem, I wasn't read the thread carefully Very Happy

.
The fixed eventhandler looks like this:

EventHandler handler = new EventHandler() {
	public void handleEvent(final Event event) {
		if (!parent.isDisposed()) {
			parent.getDisplay().syncExec(new Runnable() {
				public void run() {
					Message msg = (Message)event.getProperty("ENTRY");
					selectTaskFromTree(msg);
				}
			});
		}
	}
};

Report message to a moderator

Re: org.eclipse.swt.SWTException: Widget is disposed [message #1707214 is a reply to message #1707209]

Thu, 03 September 2015 06:51

kon f

Messages: 152
Registered: March 2012

Senior Member

Hey,

we use a pure e4 application and listen with to events that need to be processed on the UI trhead with the following code:

@Inject @Optional
void closeHandler(@UIEventTopic(''TOPIC_STRING'') foo.Bar payload) {
    // Useful work that has access to payload.  The instance of foo.Bar that the event poster placed on the global event bus with the topic ''TOPIC_STRING''
}

For you, there must be a subclass that does the UI think for you Smile