mattcasters opened a new issue, #8662:
URL: https://github.com/apache/hop/issues/8662
### Apache Hop version?
2.20.0
### Java version?
OpenJDK 21
### Operating system
Linux
### What happened?
Needs to be hardened. When switching projects we should have an empty
Undo/Redo stack:
```
org.apache.hop.core.exception.HopException:
Error capturing WorkflowMeta snapshot
Cannot invoke "Object.getClass()" because "valueObject" is null
at
org.apache.hop.core.undo.XmlSnapshotUndo.captureSnapshot(XmlSnapshotUndo.java:118)
at
org.apache.hop.ui.hopgui.file.shared.HopGuiGraphSnapshotUndo.captureQuiet(HopGuiGraphSnapshotUndo.java:192)
at
org.apache.hop.ui.hopgui.file.shared.HopGuiGraphSnapshotUndo.initialize(HopGuiGraphSnapshotUndo.java:64)
at
org.apache.hop.ui.hopgui.file.workflow.HopGuiWorkflowGraph.<init>(HopGuiWorkflowGraph.java:487)
at
org.apache.hop.ui.hopgui.perspective.explorer.ExplorerPerspective.addWorkflow(ExplorerPerspective.java:2771)
at
org.apache.hop.ui.hopgui.file.workflow.HopWorkflowFileType.openFile(HopWorkflowFileType.java:151)
at
org.apache.hop.ui.hopgui.delegates.HopGuiFileDelegate.fileOpenWithType(HopGuiFileDelegate.java:163)
at
org.apache.hop.ui.hopgui.delegates.HopGuiAuditDelegate.openLastFilesInternal(HopGuiAuditDelegate.java:198)
at
org.apache.hop.ui.hopgui.delegates.HopGuiAuditDelegate.openLastFiles(HopGuiAuditDelegate.java:92)
at
org.apache.hop.projects.gui.ProjectsGuiPlugin.enableHopGuiProject(ProjectsGuiPlugin.java:268)
at
org.apache.hop.projects.gui.ProjectsGuiPlugin.selectProject(ProjectsGuiPlugin.java:1056)
at
org.apache.hop.projects.gui.ProjectsGuiPlugin.lambda$3(ProjectsGuiPlugin.java:890)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5865)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1656)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:5080)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4515)
at org.apache.hop.ui.hopgui.HopGui.open(HopGui.java:879)
at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:697)
at org.apache.hop.ui.hopgui.HopCommandGui.run(HopCommandGui.java:84)
at picocli.CommandLine.executeUserObject(CommandLine.java:2045)
at picocli.CommandLine.access$1500(CommandLine.java:148)
at
picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2469)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2461)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2423)
at
picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2277)
at picocli.CommandLine$RunLast.execute(CommandLine.java:2425)
at picocli.CommandLine.execute(CommandLine.java:2174)
at org.apache.hop.hop.Hop.main(Hop.java:162)
Caused by: java.lang.NullPointerException: Cannot invoke "Object.getClass()"
because "valueObject" is null
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeMapValueToXml(XmlMetadataUtil.java:583)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeMapToXml(XmlMetadataUtil.java:556)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeMapValueToXml(XmlMetadataUtil.java:594)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeMapToXml(XmlMetadataUtil.java:556)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeObjectToXml(XmlMetadataUtil.java:471)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeFieldValueToXml(XmlMetadataUtil.java:417)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeObjectToXml(XmlMetadataUtil.java:317)
at
org.apache.hop.metadata.serializer.xml.XmlMetadataUtil.serializeObjectToXml(XmlMetadataUtil.java:256)
at
org.apache.hop.core.undo.XmlSnapshotUndo.captureSnapshot(XmlSnapshotUndo.java:115)
... 28 more
```
### Issue Priority
Priority: 2
### Issue Component
Component: Hop Gui
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