Code assist partially fails on latest Eclipse

[macgibbon]

On eclipse 09-22, using javafx sdk 18.0.1 with jdk 17, I get the following an error message "Error computing completion proposals." on control space in the e(fx)clipse css editor after the colon in the code below. I believe there is supposed to be a gradient picker popup choice.

Other code completion options do work, for instance control space does show the various fx-properties.

.button {
	-fx-background-color: 
}

The stack trace from the error log is below:

java.lang.NoClassDefFoundError: javafx/scene/Parent
	at org.eclipse.fx.ide.css.cssext.proposals.internal.paint.PaintProposalContributer.getProposal(PaintProposalContributer.java:26)
	at org.eclipse.fx.ide.css.cssext.ui.CssExtManager.getContributedProposalsForRule(CssExtManager.java:324)
	at org.eclipse.fx.ide.css.cssext.parser.CssExtParser.parseRef(CssExtParser.java:389)
	at org.eclipse.fx.ide.css.cssext.parser.CssExtParser.parse(CssExtParser.java:77)
	at org.eclipse.fx.ide.css.cssext.parser.CssExtParser.parseConcat(CssExtParser.java:136)
	at org.eclipse.fx.ide.css.cssext.parser.CssExtParser.parse(CssExtParser.java:83)
	at org.eclipse.fx.ide.css.cssext.parser.CssExtParser.findProposals(CssExtParser.java:967)
	at org.eclipse.fx.ide.css.cssext.ui.internal.DefaultCssExtProvider.getValueProposalsForProperty(DefaultCssExtProvider.java:137)
	at org.eclipse.fx.ide.css.ui.contentassist.CssDslProposalProvider.complete_CssTok(CssDslProposalProvider.java:199)
	at jdk.internal.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:303)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractJavaBasedContentProposalProvider.invokeMethod(AbstractJavaBasedContentProposalProvider.java:301)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractJavaBasedContentProposalProvider.completeRuleCall(AbstractJavaBasedContentProposalProvider.java:197)
	at org.eclipse.fx.ide.css.ui.contentassist.AbstractCssDslProposalProvider.completeCss_declaration_ValueTokens(AbstractCssDslProposalProvider.java:143)
	at jdk.internal.reflect.GeneratedMethodAccessor102.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:303)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractJavaBasedContentProposalProvider.invokeMethod(AbstractJavaBasedContentProposalProvider.java:301)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractJavaBasedContentProposalProvider.completeAssignment(AbstractJavaBasedContentProposalProvider.java:206)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractContentProposalProvider$DefaultContentAssistProcessorSwitch.caseAssignment(AbstractContentProposalProvider.java:67)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractContentProposalProvider$DefaultContentAssistProcessorSwitch.caseAssignment(AbstractContentProposalProvider.java:1)
	at org.eclipse.xtext.util.XtextSwitch.doSwitch(XtextSwitch.java:144)
	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)
	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractContentProposalProvider$DefaultContentAssistProcessorSwitch.accept(AbstractContentProposalProvider.java:73)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractContentProposalProvider.createProposals(AbstractContentProposalProvider.java:105)
	at org.eclipse.xtext.ui.editor.contentassist.AbstractJavaBasedContentProposalProvider.createProposals(AbstractJavaBasedContentProposalProvider.java:276)
	at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:53)
	at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:1)
	at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:70)
	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.internalReadOnly(XtextDocument.java:525)
	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.priorityReadOnly(XtextDocument.java:489)
	at org.eclipse.xtext.ui.editor.model.XtextDocument.priorityReadOnly(XtextDocument.java:145)
	at org.eclipse.xtext.ui.editor.contentassist.XtextContentAssistProcessor.computeCompletionProposals(XtextContentAssistProcessor.java:77)
	at org.eclipse.jface.text.contentassist.ContentAssistant$2.lambda$0(ContentAssistant.java:2063)
	at java.base/java.util.Collections$SingletonSet.forEach(Collections.java:4905)
	at org.eclipse.jface.text.contentassist.ContentAssistant$2.run(ContentAssistant.java:2062)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:2059)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:577)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.lambda$0(CompletionProposalPopup.java:507)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:74)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:502)
	at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1873)
	at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:978)
	at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1468)
	at org.eclipse.ui.texteditor.ContentAssistAction.lambda$0(ContentAssistAction.java:85)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:74)
	at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:84)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:474)
	at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:121)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:97)
	at jdk.internal.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:317)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:251)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:173)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:156)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:485)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:308)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:580)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:647)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:439)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:96)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1065)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1090)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1075)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1117)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1113)
	at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1542)
	at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4867)
	at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4745)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:5028)
	at org.eclipse.swt.internal.win32.OS.DispatchMessage(Native Method)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3643)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:643)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:550)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
Caused by: java.lang.ClassNotFoundException: javafx.scene.Parent cannot be found by org.eclipse.fx.ide.css.cssext.proposals_3.8.0.202204150904
	at org.eclipse.osgi.internal.loader.BundleLoader.generateException(BundleLoader.java:541)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass0(BundleLoader.java:536)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:416)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:168)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	... 107 more

[tomsontom]

ok I see - we expec that the JDK you run Eclipse with contains OpenJFX - we should check if JavaFX is available to avoid this error

[macgibbon]

Ok, it works if I download Azul's Jdk with JFX included and change the eclipse.ini file to use that JDK.

Thank you.

[macgibbon]

Ok, the choice to "Pick Color" works in the content assist, but the choice "Pick Paint" generates the stack trace below missing FXCanvas:

The FXCanvas class is present at C:\Program Files\Zulu\zulu-19\lib\javafx-swt.jar but Eclipse isn't picking up the jar file in the classpath when launching. I tried to add the jar as a -vmargs line in Eclipse.ini but that crashes the jvm on launching Eclipse. Is there a workaround?

java.lang.NoClassDefFoundError: javafx/embed/swt/FXCanvas
	at org.eclipse.fx.ide.css.cssext.proposals.internal.paint.PaintProposal.show(PaintProposal.java:67)
	at org.eclipse.fx.ide.css.ui.contentassist.CssDslProposalProvider$1.getActualReplacementString(CssDslProposalProvider.java:87)
	at org.eclipse.xtext.ui.editor.contentassist.ReplacementTextApplier.apply(ReplacementTextApplier.java:22)
	at org.eclipse.xtext.ui.editor.contentassist.ConfigurableCompletionProposal.apply(ConfigurableCompletionProposal.java:171)
	at org.eclipse.xtext.ui.editor.contentassist.ConfigurableCompletionProposal.apply(ConfigurableCompletionProposal.java:383)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.insertProposal(CompletionProposalPopup.java:999)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.insertSelectedProposalWithMask(CompletionProposalPopup.java:951)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup$3.widgetDefaultSelected(CompletionProposalPopup.java:697)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:123)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4251)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4068)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3645)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:643)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:550)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:578)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
Caused by: java.lang.ClassNotFoundException: javafx.embed.swt.FXCanvas cannot be found by org.eclipse.fx.ide.css.cssext.proposals_3.8.0.202204150904
	... 33 more

[tomsontom]

I need to look into this - you can't do anything to fix this as the classloader to load FXCanvas needs to have access to SWT and JavaFX at the same time which is nothing you can provide by a command line switch

[nlisker]

Most projects get JavaFX as dependencies via Maven/Gradle. If the modules are required to be in the JDK, this severely limits the usability of the css autocomplete feature.