mattcasters opened a new issue, #7896:
URL: https://github.com/apache/hop/issues/7896
## Description
When running a pipeline in Hop GUI, the Console sometimes logs:
```
ERROR: Error calling extension point 'GetFieldsExtension'
org.eclipse.swt.SWTException: Invalid thread access
at ExplorerPerspective.getActiveFileTypeHandler
at HopGui.getActivePipelineGraph
at TestingGuiPlugin.getCurrentUnitTest / getStateMap
at PipelineGetFieldsExtensionPoint
at PipelineMeta.getThisTransformFields
at LineageTransformSchemaEmitter (design-graph fallback)
at LineageHubTransformFinishXp (TransformFinished)
at RunThread.run
```
## Cause
`TransformFinished` lineage runs on a worker thread and may call
`PipelineMeta.getTransformFields`. That fires `GetFieldsExtension`, which looks
up the active unit test via SWT widgets. SWT only allows UI-thread access. The
exception is caught and logged; the pipeline continues (console spam).
## Expected
No Invalid thread access / GetFieldsExtension ERROR when running pipelines.
Design-time Get Fields and unit-test input dataset overrides still work on the
UI thread.
## Proposed fix
In `TestingGuiPlugin.getCurrentUnitTest` (and `getPipelineGraph` if
present): if `Display.getCurrent() == null`, return `null` without touching
widgets. Optionally broaden design-graph fallback catches in
`LineageTransformSchemaEmitter`.
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