mattcasters commented on issue #3169:
URL: https://github.com/apache/hop/issues/3169#issuecomment-1811494575

   ProjectsGuiPlugin:576 : `hopGui.getDisplay().getActiveShell()` is null so 
the error dialog doesn't pop up.
   
   Original error comes from:
   
   ```
   java.lang.IllegalArgumentException: Argument cannot be null
   at org.eclipse.swt.SWT.error(SWT.java:4899)
   at org.eclipse.swt.SWT.error(SWT.java:4833)
   at org.eclipse.swt.SWT.error(SWT.java:4804)
   at org.eclipse.swt.widgets.Dialog.error(Dialog.java:202)
   at org.eclipse.swt.widgets.Dialog.checkParent(Dialog.java:168)
   at org.eclipse.swt.widgets.Dialog.<init>(Dialog.java:131)
   at org.apache.hop.ui.core.dialog.MessageBox.<init>(MessageBox.java:59)
   at 
org.apache.hop.projects.gui.ProjectsGuiPlugin.askAboutProjectRefresh(ProjectsGuiPlugin.java:181)
   at 
org.apache.hop.projects.gui.ProjectsGuiPlugin.editEnvironment(ProjectsGuiPlugin.java:569)
   at 
org.apache.hop.projects.gui.ProjectsGuiPlugin.editSelectedEnvironment(ProjectsGuiPlugin.java:636)
   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
   at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.base/java.lang.reflect.Method.invoke(Method.java:566)
   at 
org.apache.hop.ui.core.gui.BaseGuiWidgets.lambda$getListener$1(BaseGuiWidgets.java:216)
   at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
   at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5855)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1529)
   at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:5065)
   at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4517)
   at org.apache.hop.ui.hopgui.HopGui.open(HopGui.java:473)
   at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:351)
   ```
   
   so ProjectsGuiPlugin, again `hopGui.getDisplay().getActiveShell()`.
   
   Broken by #2944, needs to be hardened or code reverted.


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