mattcasters opened a new issue, #9227:
URL: https://github.com/apache/hop/issues/9227
### Apache Hop version?
2.21.0-SNAPSHOT
### Java version?
21
### Operating system
Linux
### What happened?
Quitting the Hop GUI prints this on the console and exits with an error:
```
Serious error detected in the Hop GUI: Failed to execute runnable
(java.lang.NullPointerException: Cannot invoke
"org.eclipse.swt.custom.CTabFolder.getItemCount()" because the return value of
"org.apache.hop.ui.hopgui.perspective.explorer.ExplorerPerspective.getTargetTabFolder()"
is null)
org.eclipse.swt.SWTException: Failed to execute runnable
(java.lang.NullPointerException: Cannot invoke
"org.eclipse.swt.custom.CTabFolder.getItemCount()" because the return value of
"org.apache.hop.ui.hopgui.perspective.explorer.ExplorerPerspective.getTargetTabFolder()"
is null)
at org.eclipse.swt.SWT.error(SWT.java:4934)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3643)
at org.eclipse.swt.widgets.Display.release(Display.java:4002)
at org.eclipse.swt.graphics.Device.dispose(Device.java:267)
```
`Display.dispose()` still runs queued `asyncExec` updates after the editor
tabs are gone. A pipeline graph update calls `HopGui.handleFileCapabilities()`,
which asks `ExplorerPerspective.hasNavigationPreviousFile()`. That method calls
`getItemCount()` on a tab folder that is already null. The exception escapes
`display.dispose()`, so `HopGui.main` prints "Serious error detected in the Hop
GUI".
The same navigation methods in the metadata and execution perspectives call
`getItemCount()` on their tab folder without a disposed check.
### Issue Priority
Priority: 3
### Issue Component
Component: Hop Gui
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