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When trying to validate a model using Eclipse headless mode over SSH then the following error occurs. Caused by: org.eclipse.swt.SWTError: No more handles [gtk_init_check() failed] at org.eclipse.swt.SWT.error(SWT.java:4725) at org.eclipse.swt.widgets.Display.createDisplay(Display.java:1062) at org.eclipse.swt.widgets.Display.create(Display.java:1042) at org.eclipse.swt.graphics.Device.<init>(Device.java:175) at org.eclipse.swt.widgets.Display.<init>(Display.java:608) at org.eclipse.swt.widgets.Display.<init>(Display.java:599) at org.eclipse.swt.widgets.Display.getDefault(Display.java:2448) at org.eclipse.papyrus.infra.gmfdiag.preferences.pages.PapyrusAllDiagramsPreferencePage.initDefaults(PapyrusAllDiagramsPreferencePage.java:107) at org.eclipse.papyrus.infra.gmfdiag.preferences.PapyrusPreferenceInitializer.initializeDefaultPreferences(PapyrusPreferenceInitializer.java:42) at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper$1.run(PreferenceServiceRegistryHelper.java:301) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper.runInitializer(PreferenceServiceRegistryHelper.java:304) at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper.applyRuntimeDefaults(PreferenceServiceRegistryHelper.java:134) at org.eclipse.core.internal.preferences.PreferencesService.applyRuntimeDefaults(PreferencesService.java:375) at org.eclipse.core.internal.preferences.DefaultPreferences.applyRuntimeDefaults(DefaultPreferences.java:225) at org.eclipse.core.internal.preferences.DefaultPreferences.load(DefaultPreferences.java:279) at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:370) at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:623) at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:766) at org.eclipse.core.internal.preferences.AbstractScope.getNode(AbstractScope.java:41) at org.eclipse.core.runtime.preferences.DefaultScope.getNode(DefaultScope.java:77) at org.eclipse.papyrus.infra.ui.preferences.PapyrusScopedPreferenceStore.getDefaultPreferences(PapyrusScopedPreferenceStore.java:274) at org.eclipse.papyrus.infra.ui.preferences.PapyrusScopedPreferenceStore.setDefault(PapyrusScopedPreferenceStore.java:682) at org.eclipse.gmf.runtime.diagram.ui.preferences.DiagramsPreferencePage.initDefaults(DiagramsPreferencePage.java:124) at org.eclipse.papyrus.uml.diagram.activity.preferences.DiagramPreferenceInitializer.initializeDefaultPreferences(DiagramPreferenceInitializer.java:34) at org.eclipse.papyrus.uml.diagram.activity.part.UMLDiagramEditorPlugin.start(UMLDiagramEditorPlugin.java:107) at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:842) Looks like plugin activation is trying to set default values but it assumes that the workbench exist. This prevents any headless application from running over SSH that doesn't have display X. Maybe it should check if workbench exist first.
The validation constraint bindings are done in the diagram plugin which requires UI access (Preference page). Maybe there should be a separate plugin for validation only to perform constraint bindings so headless application can perform validation.
I think there are more than one diagram plugins that do this(activity, sequence, and statemachine) so all of them need to check if workbench is running before trying to set the preference value. Maybe this could do the trick? if (PlatformUI.isWorkbenchRunning()) { then set preference value. }
I confirm this bug.
