leehaut opened a new issue, #9213:
URL: https://github.com/apache/hop/issues/9213
### Apache Hop version?
2.21.0-SNAPSHOT
### Java version?
openjdk 21
### Operating system
Windows
### What happened?
## Description
In Hop GUI, pressing **Ctrl+V** when the system clipboard has no text
content(for example after copying a file in the OS file manager, which uses a
file transfer type rather than text) causes a `NullPointerException` in the
workflow / pipeline paste handlers.
## Steps to reproduce
1. Open a workflow or pipeline in Hop GUI.
2. Copy a file in the OS file explorer (Ctrl+C), **or** leave the text
clipboard empty.
3. Focus Hop GUI and press Ctrl+V (paste).
4. Observe an error dialog / stack trace with NPE.
Optional (File Explorer):
1. Open the File Explorer perspective.
2. Select a file and press Ctrl+C, then Ctrl+V on a folder.
3. Observe the same NPE (or confusing paste behavior) instead of guidance
to use drag and drop.
## Expected behavior
- Workflow / pipeline: if clipboard text is `null` or empty, paste should be
a no-op (no paste, no dialog, no NPE). Valid Hop clipboard content (actions,
transforms, notes, etc.) must still paste normally.
- File Explorer: Ctrl+C / Ctrl+V should show an informational message that
file copy/paste via clipboard is not supported, and that files should be
dragged onto the target folder.
## Actual behavior
```txt
java.lang.NullPointerException: Cannot invoke "String.startsWith(String)"
because "clipboardContent" is null
at
org.apache.hop.ui.hopgui.file.workflow.delegates.HopGuiWorkflowClipboardDelegate.pasteNoXmlContent(HopGuiWorkflowClipboardDelegate.java:205)
at
org.apache.hop.ui.hopgui.file.workflow.delegates.HopGuiWorkflowClipboardDelegate.pasteXml(HopGuiWorkflowClipboardDelegate.java:194)
at
org.apache.hop.ui.hopgui.file.workflow.HopGuiWorkflowGraph.pasteFromClipboard(HopGuiWorkflowGraph.java:3293)
at org.apache.hop.ui.hopgui.HopGui.menuEditPaste(HopGui.java:1806)
at
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at
org.apache.hop.ui.hopgui.HopGuiKeyHandler.handleKey(HopGuiKeyHandler.java:456)
at
org.apache.hop.ui.hopgui.HopGuiKeyHandler.keyPressed(HopGuiKeyHandler.java:302)
at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:209)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4363)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1217)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1241)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1226)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1268)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1264)
at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1747)
at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:5087)
at org.eclipse.swt.widgets.Tree.WM_CHAR(Tree.java:6108)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4964)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:6103)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5131)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3747)
at org.apache.hop.ui.hopgui.HopGui.open(HopGui.java:899)
at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:714)
```
### Issue Priority
Priority: 3
### Issue Component
Component: Hop Gui
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