Aw: Re: Re: "Toolkit already initialized" error with OpenJDK 11

[Kevin Rushforth]

Thanks.

-- Kevin


On 10/5/2018 12:10 AM, marcel Austenfeld wrote:
> I created a bug report on https://bugs.java.com/
> Bug ID is: 9057517
> *Gesendet:* Donnerstag, 04. Oktober 2018 um 16:13 Uhr
> *Von:* "Kevin Rushforth" <kevin.rushforth at oracle.com>
> *An:* "marcel Austenfeld" <marcel.au at web.de>
> *Cc:* openjfx-dev at openjdk.java.net
> *Betreff:* Re: Aw: Re: "Toolkit already initialized" error with OpenJDK 11
> I think I see what caused this. In FX 8 we called FXCanvas::initFx from
> the constructor of every FXCanvas. It then called an internal startup
> method, PlatformImpl::startup, that permits calling it when the Toolkit
> is already initialized, turning it into a runLater if it is. As part of
> the refactoring for FX 9 I changed it to call FXCanvas::initFx one time
> from the static block. At the same time, I changed the startup call to
> use the public Platform::startup method. This change was necessary
> because the javafx.swt module does not have the needed qualified exports
> to call internal methods until after initialization. The public
> Platform::startup method is specified to throw an exception if called
> more than once.
>
> So if the FXCanvas class is loaded more than once, for example, if it is
> called from different ClassLoaders, then that would cause the problem.
> Please file a bug and I'll take a look at it. It might be as simple as
> wrapping the call to Platform::startup in a try/catch and calling
> Platform::runLater in the catch block.
>
> -- Kevin
>
>
> On 10/4/2018 6:03 AM, marcel Austenfeld wrote:
> > Hello Kevin,
> >
> > I still have problems with the error: 
> "java.lang.IllegalStateException: Toolkit already initialized".
> >
> > However I found out that this error only occurs if I call SWT 
> FXCanvas classes located in different Eclipse plugins.
> >
> > I can create multiple JavaFX canvas if they are located in one 
> Eclipse plugin.
> >
> > Vice versa if I try to to open the JavaFX SceneBuilder canvas which 
> is located in a seperate Eclipse plugin this error occurs again.
> >
> > So I wonder that beginning with Java 9 the JavaFX toolkit doesn't 
> recognize an already started toolkit in another Eclipse plugin (which 
> was definitely the case with Java 8!).
> >
> > Maybee this has something to do with the new module system of Java >=9?
> >
> >
> >
> >
> > Gesendet: Mittwoch, 26. September 2018 um 14:09 Uhr
> > Von: "Kevin Rushforth" <kevin.rushforth at oracle.com>
> > An: "marcel Austenfeld" <marcel.au at web.de>, openjfx-dev at openjdk.java.net
> > Betreff: Re: "Toolkit already initialized" error with OpenJDK 11
> > I'm' not aware of anything that intentionally changed between FX in JDK
> > 8 and FX 11, but my guess is that the FX runtime is being shutdown after
> > your first FXCanvas exits. Try making the following call (only needed
> > one time) before creating your first FXCanvas:
> >
> >     Platform.setImplicitExit(false);
> >
> > -- Kevin
> >
> > On 9/26/2018 4:22 AM, marcel Austenfeld wrote:
> >> First of all congratulation to the new release and thank you for 
> the hard work on JavaFX.
> >>
> >>
> >> I have a problem with JavaFX which in my case is embedded in a Rich 
> Client Platform of Eclipse.
> >>
> >> I integrated several SWT FXCanvas (some with SwingNode panels as a 
> SWT_AWT replacement) into my app.
> >>
> >> This works fine in Java 8 which my current release depends on.
> >>
> >> However in Java 11 after the second panel is initialized at startup 
> I get the following error:
> >>
> >> "Caused by: java.lang.IllegalStateException: Toolkit already 
> initialized"
> >>
> >> Is there a new option available to avoid a new initialization of 
> the toolkit if several FXCanvas are embedded in an application?
> >> Or do you now any changes since Java 8 which could the cause of 
> such an exception?
> >>
> >>
> >> Thanks in advance for any help.
> >