How to resolve conflicting handler being thrown when open a markdown file?

[ethanyhou]

Hi team,

Is there a way to avoid a conflicting handler being thrown when opening a Markdown file?

Repro: open a markdown file in a project.

Then the following exceptions will be thrown:

null
org.eclipse.ui
Error
Wed Jul 23 18:49:30 CST 2025
Conflicting handlers for org.eclipse.ui.edit.findIncrementalReverse: {ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@6ff56a8e)} vs {ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@6ff56a8e)} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext

java.lang.IllegalStateException: Conflicting handlers: {[ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@6ff56a8e),  for 'org.eclipse.ui.edit.findIncrementalReverse',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} vs {[ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@6ff56a8e),  for 'org.eclipse.ui.edit.findIncrementalReverse',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext
	at org.eclipse.ui.internal.handlers.LegacyHandlerService$HandlerSelectionFunction.compute(LegacyHandlerService.java:143)
	at org.eclipse.e4.core.internal.contexts.ValueComputation.get(ValueComputation.java:70)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.internalGet(EclipseContext.java:265)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:230)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.lookUpHandler(HandlerServiceImpl.java:99)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.handlerChanged(E4HandlerProxy.java:115)
	at org.eclipse.core.commands.AbstractHandler.fireHandlerChanged(AbstractHandler.java:77)
	at org.eclipse.jface.commands.ActionHandler.lambda$0(ActionHandler.java:84)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:52)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:75)
	at org.eclipse.jface.action.Action.setEnabled(Action.java:541)
	at org.eclipse.ui.texteditor.IncrementalFindAction.update(IncrementalFindAction.java:118)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateAction(AbstractTextEditor.java:5390)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateContentDependentActions(AbstractTextEditor.java:5474)
	at org.eclipse.ui.texteditor.AbstractTextEditor$TextListener.lambda$0(AbstractTextEditor.java:626)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4094)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3710)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:668)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:576)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:670)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:607)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1492)

null
org.eclipse.ui
Error
Wed Jul 23 18:49:30 CST 2025
Conflicting handlers for org.eclipse.ui.edit.findIncremental: {ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@38f55141)} vs {ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@38f55141)} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext

java.lang.IllegalStateException: Conflicting handlers: {[ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@38f55141),  for 'org.eclipse.ui.edit.findIncremental',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} vs {[ActionHandler(org.eclipse.ui.texteditor.IncrementalFindAction@38f55141),  for 'org.eclipse.ui.edit.findIncremental',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext
	at org.eclipse.ui.internal.handlers.LegacyHandlerService$HandlerSelectionFunction.compute(LegacyHandlerService.java:143)
	at org.eclipse.e4.core.internal.contexts.ValueComputation.get(ValueComputation.java:70)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.internalGet(EclipseContext.java:265)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:230)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.lookUpHandler(HandlerServiceImpl.java:99)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.handlerChanged(E4HandlerProxy.java:115)
	at org.eclipse.core.commands.AbstractHandler.fireHandlerChanged(AbstractHandler.java:77)
	at org.eclipse.jface.commands.ActionHandler.lambda$0(ActionHandler.java:84)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:52)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:75)
	at org.eclipse.jface.action.Action.setEnabled(Action.java:541)
	at org.eclipse.ui.texteditor.IncrementalFindAction.update(IncrementalFindAction.java:118)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateAction(AbstractTextEditor.java:5390)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateContentDependentActions(AbstractTextEditor.java:5474)
	at org.eclipse.ui.texteditor.AbstractTextEditor$TextListener.lambda$0(AbstractTextEditor.java:626)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4094)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3710)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:668)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:576)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:670)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:607)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1492)

null
org.eclipse.ui
Error
Wed Jul 23 18:49:30 CST 2025
Conflicting handlers for org.eclipse.ui.edit.findPrevious: {ActionHandler(org.eclipse.ui.texteditor.FindNextAction@7fa1d440)} vs {ActionHandler(org.eclipse.ui.texteditor.FindNextAction@7fa1d440)} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext

java.lang.IllegalStateException: Conflicting handlers: {[ActionHandler(org.eclipse.ui.texteditor.FindNextAction@7fa1d440),  for 'org.eclipse.ui.edit.findPrevious',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} vs {[ActionHandler(org.eclipse.ui.texteditor.FindNextAction@7fa1d440),  for 'org.eclipse.ui.edit.findPrevious',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext
	at org.eclipse.ui.internal.handlers.LegacyHandlerService$HandlerSelectionFunction.compute(LegacyHandlerService.java:143)
	at org.eclipse.e4.core.internal.contexts.ValueComputation.get(ValueComputation.java:70)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.internalGet(EclipseContext.java:265)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:230)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.lookUpHandler(HandlerServiceImpl.java:99)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.handlerChanged(E4HandlerProxy.java:115)
	at org.eclipse.core.commands.AbstractHandler.fireHandlerChanged(AbstractHandler.java:77)
	at org.eclipse.jface.commands.ActionHandler.lambda$0(ActionHandler.java:84)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:52)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:75)
	at org.eclipse.jface.action.Action.setEnabled(Action.java:541)
	at org.eclipse.ui.texteditor.FindNextAction.update(FindNextAction.java:238)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateAction(AbstractTextEditor.java:5390)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateContentDependentActions(AbstractTextEditor.java:5474)
	at org.eclipse.ui.texteditor.AbstractTextEditor$TextListener.lambda$0(AbstractTextEditor.java:626)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4094)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3710)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:668)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:576)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:670)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:607)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1492)

null
org.eclipse.ui
Error
Wed Jul 23 18:49:30 CST 2025
Conflicting handlers for org.eclipse.ui.edit.findNext: {ActionHandler(org.eclipse.ui.texteditor.FindNextAction@36fbef4b)} vs {ActionHandler(org.eclipse.ui.texteditor.FindNextAction@36fbef4b)} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext

java.lang.IllegalStateException: Conflicting handlers: {[ActionHandler(org.eclipse.ui.texteditor.FindNextAction@36fbef4b),  for 'org.eclipse.ui.edit.findNext',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} vs {[ActionHandler(org.eclipse.ui.texteditor.FindNextAction@36fbef4b),  for 'org.eclipse.ui.edit.findNext',  in PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext, activeWhen=ActivePartExpression(org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor@4b00c1cf), active=true, sourcePriority=1048576, participating=true]} in: PartImpl (org.eclipse.e4.ui.compatibility.editor)  removeOnHide org.eclipse.mylyn.wikitext.ui.editor.markupEditorContext
	at org.eclipse.ui.internal.handlers.LegacyHandlerService$HandlerSelectionFunction.compute(LegacyHandlerService.java:143)
	at org.eclipse.e4.core.internal.contexts.ValueComputation.get(ValueComputation.java:70)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.internalGet(EclipseContext.java:265)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:230)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.lookUpHandler(HandlerServiceImpl.java:99)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.handlerChanged(E4HandlerProxy.java:115)
	at org.eclipse.core.commands.AbstractHandler.fireHandlerChanged(AbstractHandler.java:77)
	at org.eclipse.jface.commands.ActionHandler.lambda$0(ActionHandler.java:84)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:52)
	at org.eclipse.jface.action.AbstractAction.firePropertyChange(AbstractAction.java:75)
	at org.eclipse.jface.action.Action.setEnabled(Action.java:541)
	at org.eclipse.ui.texteditor.FindNextAction.update(FindNextAction.java:238)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateAction(AbstractTextEditor.java:5390)
	at org.eclipse.ui.texteditor.AbstractTextEditor.updateContentDependentActions(AbstractTextEditor.java:5474)
	at org.eclipse.ui.texteditor.AbstractTextEditor$TextListener.lambda$0(AbstractTextEditor.java:626)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4094)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3710)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:668)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:576)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:670)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:607)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1492)

Thank you for your help!

[apozog]

Also when following a link to another .md file, Eclipse totally hangs.

[merks]

@ruspl-afed

Do you think this (these things) a a Mylyn problem?

[ruspl-afed]

I can see Mylyn in the trace, perhaps you are right @merks
@ethanyhou please create an issue for Eclipse Mylyn with more detailed information about the versions of the used eclipse components.