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RCP to RAP problem with Singleton [message #530422]

Thu, 29 April 2010 15:37

Dove

Messages: 2
Registered: April 2010

Junior Member

Hello, I would really appreciate help with problem I'm having.
I followed instructions for use singleton in RAP from http://wiki.eclipse.org/RAP/FAQ#What_is_a_Session_Singleton_ and_how_can_I_implement_one.3F
So my code from non-UI thread looks now:

final Display display = Display.getCurrent();
	public void run() {
		UICallBack.runNonUIThreadWithFakeContext( display, new Runnable() {
			
		      public void run() {
		    	  Session session = Session.getInstance();
		        // do something with the session singleton
		    	  
		  		// cekani na pripojeni
		  		while (!session.isConnected()) {

When i try to run it i am getting this message:

Exception in thread "Thread-8" java.lang.IllegalStateException: No context available outside of the request service lifecycle.
	at org.eclipse.rwt.internal.service.ContextProvider.getContext(ContextProvider.java:108)
	at org.eclipse.rwt.internal.service.ContextProvider.getStateInfo(ContextProvider.java:166)
	at org.eclipse.rwt.SessionSingletonBase.getInstance(SessionSingletonBase.java:84)
	at chess.model.Session.getInstance(Session.java:61)
	at chess.parsers.GameParser.run(GameParser.java:44)
Exception in thread "Thread-6" java.lang.NullPointerException
	at org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler.getDisplayAdapter(UICallBackServiceHandler.java:549)
	at org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler.runNonUIThreadWithFakeContext(UICallBackServiceHandler.java:452)
	at org.eclipse.rwt.lifecycle.UICallBack.runNonUIThreadWithFakeContext(UICallBack.java:44)
	at chess.parsers.SoughtParser.run(SoughtParser.java:44)

I cant find any help for the second exception. I would really appreciate help with this problem.
Thanks in Advance.

Problem solved. I was creating this non-UI thread from Activator. When i am creating this from Application then there is not this problem anymore.

[Updated on: Thu, 29 April 2010 17:06]

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Re: RCP to RAP problem with Singleton [message #530477 is a reply to message #530422]

Thu, 29 April 2010 18:02

Rüdiger Herrmann

Messages: 581
Registered: July 2009

Senior Member

hm, the snippet looks OK so far and should work.
Can you ensure that Display.getCurrent() is actually executed on the
UI-Thread?
Can you extract a snippet from your application that runs standalone but
reproduces the problem?

HTH
Rüdiger
--
Rüdiger Herrmann
http://eclipsesource.com

On 29.04.2010 17:37, Dove wrote:
> Hello, I would really appreciate help with problem I'm having. I
> followed instructions for use singleton in RAP from
> http://wiki.eclipse.org/RAP/FAQ#What_is_a_Session_Singleton_ and_how_can_I_implement_one.3F
>
> So my code from non-UI class looks now:
> final Display display = Display.getCurrent();
> public void run() {
> UICallBack.runNonUIThreadWithFakeContext( display, new Runnable() {
>
> public void run() {
> Session session = Session.getInstance();
> // do something with the session singleton
> // cekani na pripojeni
> while (!session.isConnected()) {
> When i try to run it i am getting this message:
> Exception in thread "Thread-8" java.lang.IllegalStateException: No
> context available outside of the request service lifecycle.
> at
> org.eclipse.rwt.internal.service.ContextProvider.getContext( ContextProvider.java:108)
>
> at
> org.eclipse.rwt.internal.service.ContextProvider.getStateInf o(ContextProvider.java:166)
>
> at
> org.eclipse.rwt.SessionSingletonBase.getInstance(SessionSing letonBase.java:84)
>
> at chess.model.Session.getInstance(Session.java:61)
> at chess.parsers.GameParser.run(GameParser.java:44)
> Exception in thread "Thread-6" java.lang.NullPointerException
> at
> org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler. getDisplayAdapter(UICallBackServiceHandler.java:549)
>
> at
> org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler. runNonUIThreadWithFakeContext(UICallBackServiceHandler.java: 452)
>
> at
> org.eclipse.rwt.lifecycle.UICallBack.runNonUIThreadWithFakeC ontext(UICallBack.java:44)
>
> at chess.parsers.SoughtParser.run(SoughtParser.java:44)
>
> I cant find any help for the second exception. I would really appreciate
> help with this problem. Thanks in Advance.

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