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GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1701814]

Wed, 15 July 2015 23:37

Patrik Suzzi

Messages: 2
Registered: February 2018

Junior Member

Hallo,

I tried to setup the development environment for GEF4, as specified in the GEF Contributor guide, and I found the following error:

FXCanvas cannot be resolved to a type.
(se attached file)

This error is persistent, and it seems i am not able to find a solution despite I tried multiple times to setup the environment, as specified in the GEF/GEF4 contributor guide .

This is the list of steps I followed for the setup

Check Java 8 (oracle) is installed, that is required by the e(fx)clipse plugin.
Download Eclipse IDE for Eclipse Committers. In my case: eclipse-committers-mars-R-win32.zip
Install plugins needed by GEF4, in my case:
1. e(fx)clipse - IDE, from http://download.eclipse.org/efxclipse/simrel-contrib/mars/m7/tools/site
2. e(fx)clipse - IDE - PDE, from http://download.eclipse.org/efxclipse/simrel-contrib/mars/m7/tools/site
3. API Tools Execution Environment Descriptions, from: http://download.eclipse.org/eclipse/updates/4.5-I-builds
4. Oomph Version Management, from: http://download.eclipse.org/releases/mars'
5. Maven Integration for Eclipse (includes Incubating components), from: http://download.eclipse.org/releases/mars
Clone the GEF4 Git repository and import the projects in the workspace
Set MARS.target: from org.eclipse.gef4.target project, double click the target definition, wait for the target is fully resolved, and click on "set as target platform".
Adjust preferences. select Menu > Window > Preferences:
1. Java > Compiler > Errors/Warnings: ignore the "Deprecated and restricted API"
2. Plug-in Development > Compilers: Ignore the "References to discouraged classes"

At the end of the setup, I can not compile the GEF4 project, because "FXCanvas cannot be resolved to a type. "
See image.
index.php/fa/22519/0/

Does anyone has an idea on how to fix this ?

Kind Regards.
Patrik

Attachment: GEF4-unable-to-resolve-some-JavaFx-classes.png
(Size: 109.89KB, Downloaded 1545 times)

[Updated on: Wed, 15 July 2015 23:39] by Moderator

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Re: GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1701828 is a reply to message #1701814]

Thu, 16 July 2015 04:49

Alexander Nyssen

Messages: 244
Registered: July 2009
Location: Lünen

Senior Member

It seems the javafx-swt-integration was not added to the classpath by e(fx)clipse. Please make sure you literally follow the section about "Specify Execution Environment for J2SE-1.7 (and optionally J2SE-1.8)" from the contributor guide.

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Re: GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1701835 is a reply to message #1701828]

Thu, 16 July 2015 06:46

Alexander Nyssen

Messages: 244
Registered: July 2009
Location: Lünen

Senior Member

I updated the respective section of the contributor guide to make it even more explicit, why the "Specify Execution Environment for J2SE-1.7 (and optionally J2SE-1.8)" is important. I also saw that the guide still listed the e(fx)clipse 2.0.0 Mars M7 contribution. I updated it to refer to the e(fx)clipse 2.0.0 Mars release. You might want to update your IDE accordingly.

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Re: GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1734379 is a reply to message #1701835]

Tue, 07 June 2016 17:03

Alex B.

Messages: 20
Registered: June 2016

Junior Member

Hi there,

unfortunately I am facing the same problem as described by Patrik. I performed pretty much the same steps as him in order to set up the environment. It just differs in the following points:
Eclipse Version: Mars (4.5.2)
e(fx)clipse - IDE 2.1.0
Both are working with a JDK 1.8 x64 so far.

After checking out the sources from https://github.com/eclipse/gef4 and importing them as separated project in Eclipse I receive the error that "FXCanvas cannot be resolved to a type. " As mentioned in the adopter guidelines, I did not manually import the jfxrt.jar, since it is assumed to be imported automatically. Maybe anyone can give me a hint how to fix this?

Thanks
Alex

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Re: GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1734937 is a reply to message #1701814]

Mon, 13 June 2016 23:09

Marco Ho

Messages: 3
Registered: June 2016

Junior Member

Hello!

I have a very similar issue.

I've already built part of an MVC application, similar to the logo example, everything worked rather well so far, except things that require javafx.embed.

I've been trying to get the SWT examples from the GEF4 repository to run.
This is what happens:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	The import javafx.embed.swt cannot be resolved
	The import javafx.embed.swt cannot be resolved
	Javadoc: FXCanvas cannot be resolved to a type
	FXCanvas cannot be resolved to a type

i'm running Neon (is this a bad idea? should i go back to mars?) , followed the instructions on the adopters guide as best as i could. e(fx)clipse PDE is installed in its newest version ().

i've added Quote:

-vm
C:\Program Files\Java\jre1.8.0_71\bin\javaw.exe

to the eclipse.ini, which didn't solve this issue.

I'm not very experienced with eclipse and its settings.
if there is a way to manually add required jars to fix this, that solution would be enough for me for now, but i haven't been able to get it to work.

any help would be much appreciated.

Attachment: fx.png
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Re: GEF4 Setup Error - FXCanvas cannot be resolved to a type [message #1735189 is a reply to message #1734937]

Thu, 16 June 2016 08:40

Matthias Wienand

Messages: 230
Registered: March 2015

Senior Member

Hi Marco,

please ensure that you precisely followed the instructions given in the adopter guide [1]. It is important that the execution environments for JavaSE-1.7 and JavaSE-1.8 are defined.

Best regards,
Matthias

[1] wiki.eclipse.org/GEF/Adopter_Guide

Attachment: pref-ee7-highlight.png
(Size: 91.16KB, Downloaded 291 times)

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