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Use maven J2SE project (probably not relevant). Create Other/Empty File, use fxml extension. The following exception is thrown: java.lang.AssertionError: this shall be called just from AWT thread at org.netbeans.modules.javafx2.editor.fxml.FXMLOpenAction.init(FXMLOpenAction.java:107) at org.netbeans.modules.javafx2.editor.fxml.FXMLOpenAction.isEnabled(FXMLOpenAction.java:123) at org.netbeans.modules.javafx2.editor.fxml.FXMLDataObject$1.getPreferredAction(FXMLDataObject.java:83) at org.openide.loaders.TemplateWizard$DefaultIterator.instantiate(TemplateWizard.java:923) at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:605) at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:439) at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:248) at org.openide.loaders.TemplateWizardIteratorWrapper.instantiate(TemplateWizardIteratorWrapper.java:160) at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1629)
Fixed in jet-main#02e9cd8e597e