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Build: NetBeans IDE 8.2 (Build 201705191307) VM: Java HotSpot(TM) 64-Bit Server VM, 25.111-b14, Java(TM) SE Runtime Environment, 1.8.0_111-b14 OS: Windows 10 User Comments: TFCarin: beuh Je travaillais!!!!!! Stacktrace: java.lang.NullPointerException at datechooser.beans.editor.appear.AppearEditor.getTags(AppearEditor.java:56) at org.netbeans.modules.form.FormPropertyEditor.getTags(FormPropertyEditor.java:283) at org.openide.explorer.propertysheet.PropUtils$DifferentValuesEditor.getTags(PropUtils.java:1711) at org.openide.explorer.propertysheet.RendererFactory.getRenderer(RendererFactory.java:236) at org.openide.explorer.propertysheet.SheetCellRenderer.getTableCellRendererComponent(SheetCellRenderer.java:158) at org.openide.explorer.propertysheet.BaseTable.prepareRenderer(BaseTable.java:626)
Created attachment 165034 [details] stacktrace
Without more information this seems like a bug of datechooser.beans.editor.appear.AppearEditor which is an external (custom) component (property editor).