Error formating java file

```
eclipse.buildId=4.38.0.20251030-0645
java.version=21.0.8
java.vendor=Eclipse Adoptium
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=de_DE
```

I Upgrade to the M2 and now from time to time getting during save:

```
java.lang.RuntimeException: Error formating SomeJavaFile.java
at org.eclipse.jdt.internal.ui.fix.CodeFormatCleanUp.createFix(CodeFormatCleanUp.java:74)
at org.eclipse.jdt.internal.corext.fix.CleanUpRefactoring.calculateChange(CleanUpRefactoring.java:792)
at org.eclipse.jdt.internal.corext.fix.CleanUpPostSaveListener.saved(CleanUpPostSaveListener.java:389)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider$4.run(CompilationUnitDocumentProvider.java:1610)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.notifyPostSaveListeners(CompilationUnitDocumentProvider.java:1604)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.commitWorkingCopy(CompilationUnitDocumentProvider.java:1388)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider$3.execute(CompilationUnitDocumentProvider.java:1463)
at org.eclipse.ui.editors.text.TextFileDocumentProvider$DocumentProviderOperation.run(TextFileDocumentProvider.java:133)
at org.eclipse.ui.actions.WorkspaceModifyDelegatingOperation.execute(WorkspaceModifyDelegatingOperation.java:71)
at org.eclipse.ui.actions.WorkspaceModifyOperation.lambda$0(WorkspaceModifyOperation.java:112)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2505)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2533)
at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:131)
at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:78)
at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:67)
at org.eclipse.ui.editors.text.TextFileDocumentProvider.executeOperation(TextFileDocumentProvider.java:471)
at org.eclipse.ui.editors.text.TextFileDocumentProvider.saveDocument(TextFileDocumentProvider.java:804)
at org.eclipse.ui.texteditor.AbstractTextEditor.performSave(AbstractTextEditor.java:5310)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.performSave(CompilationUnitEditor.java:1262)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSave(CompilationUnitEditor.java:1316)
at org.eclipse.ui.texteditor.AbstractTextEditor$TextEditorSavable.doSave(AbstractTextEditor.java:7709)
at org.eclipse.ui.Saveable.doSave(Saveable.java:213)
at org.eclipse.ui.internal.SaveableHelper.doSaveModel(SaveableHelper.java:318)
at org.eclipse.ui.internal.SaveableHelper.lambda$1(SaveableHelper.java:195)
at org.eclipse.ui.internal.SaveableHelper.lambda$3(SaveableHelper.java:261)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:435)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:354)
at org.eclipse.ui.internal.WorkbenchWindow.lambda$7(WorkbenchWindow.java:2343)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2340)
at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:269)
at org.eclipse.ui.internal.SaveableHelper.saveModels(SaveableHelper.java:206)
at org.eclipse.ui.internal.SaveableHelper.savePart(SaveableHelper.java:150)
at org.eclipse.ui.internal.WorkbenchPage.saveSaveable(WorkbenchPage.java:3812)
at org.eclipse.ui.internal.WorkbenchPage.saveEditor(WorkbenchPage.java:3825)
at org.eclipse.ui.internal.handlers.SaveHandler.execute(SaveHandler.java:80)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:277)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:98)
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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:305)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:237)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:174)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:165)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:484)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:204)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:320)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:580)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:661)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:450)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:104)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1982)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1655)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1682)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1665)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1704)
at org.eclipse.swt.widgets.Widget.gtk3_key_press_event(Widget.java:1000)
at org.eclipse.swt.widgets.Control.gtk3_key_press_event(Control.java:4024)
at org.eclipse.swt.widgets.Composite.gtk3_key_press_event(Composite.java:919)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2639)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:6868)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:6196)
at org.eclipse.swt.internal.gtk3.GTK3.gtk_main_do_event(Native Method)
at org.eclipse.swt.widgets.Display.eventProc(Display.java:1624)
at org.eclipse.swt.internal.gtk3.GTK3.gtk_main_iteration_do(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4542)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1147)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1038)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:677)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:583)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:185)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:219)
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:615)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:563)
at org.eclipse.equinox.launcher.Main.run(Main.java:1415)
at org.eclipse.equinox.launcher.Main.main(Main.java:1387)
Caused by: java.lang.StringIndexOutOfBoundsException: Index -1 out of bounds for length 2082
at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:55)
at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:52)
at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:213)
at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:210)
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:98)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
at java.base/java.lang.String.checkIndex(String.java:4832)
at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:46)
at java.base/java.lang.String.charAt(String.java:1555)
at org.eclipse.jdt.internal.formatter.TokenManager.countLineBreaksBetween(TokenManager.java:244)
at org.eclipse.jdt.internal.formatter.linewrap.WrapPreparator.applyBreaksOutsideRegions(WrapPreparator.java:1460)
at org.eclipse.jdt.internal.formatter.linewrap.WrapPreparator.finishUp(WrapPreparator.java:1394)
at org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.prepareWraps(DefaultCodeFormatter.java:437)
at org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.prepareFormattedCode(DefaultCodeFormatter.java:231)
at org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.format(DefaultCodeFormatter.java:185)
at org.eclipse.jdt.internal.corext.util.CodeFormatterUtil.reformat(CodeFormatterUtil.java:396)
at org.eclipse.jdt.internal.corext.fix.CodeFormatFix.createCleanUp(CodeFormatFix.java:81)
at org.eclipse.jdt.internal.ui.fix.CodeFormatCleanUp.createFix(CodeFormatCleanUp.java:65)
... 89 more

```

@jjohnstn maybe some recent changes in the cleanups?

Maybe this helps already
- https://github.com/laeubi/eclipse.jdt.ui/pull/2

Start with the formatter stack trace, especially org.eclipse.jdt.internal.formatter.TokenManager.java and WrapPreparator.java, then inspect CodeFormatCleanUp.java and the referenced external pull request. Reproduce the failure during save using the reported Eclipse and Java versions. Done means the formatter no longer throws StringIndexOutOfBoundsException for the affected Java file, with a regression test if the project’s existing tests identify a suitable entry point.

Written by the indexing model from the issue text.