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!ENTRY org.eclipse.core.jobs 4 2 2015-03-12 15:45:30.285 !MESSAGE An internal error occurred during: "XtextReconcilerJob". !STACK 0 java.lang.ArrayIndexOutOfBoundsException at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:536) at java.lang.StringBuffer.append(StringBuffer.java:322) at org.eclipse.jface.text.GapTextStore.get(GapTextStore.java:164) at org.eclipse.jface.text.CopyOnWriteTextStore.get(CopyOnWriteTextStore.java:139) at org.eclipse.jface.text.AbstractDocument.get(AbstractDocument.java:1029) at org.eclipse.xtext.ui.editor.DocumentBasedDirtyResource.copyState(DocumentBasedDirtyResource.java:99) at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport.announceDirtyState(DirtyStateEditorSupport.java:471) at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.postParse(XtextDocumentReconcileStrategy.java:160) at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.doReconcile(XtextDocumentReconcileStrategy.java:146) at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.reconcile(XtextDocumentReconcileStrategy.java:65) at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.doRun(XtextReconciler.java:413) at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.access$3(XtextReconciler.java:393) at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler$1.process(XtextReconciler.java:334) at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler$1.process(XtextReconciler.java:1) at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:36) at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.modify(XtextDocument.java:418) at org.eclipse.xtext.ui.editor.model.XtextDocument.internalModify(XtextDocument.java:131) at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.run(XtextReconciler.java:331) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Maybe a race.
Hard to tell what's going on here without more information. Rescheduled for 2.8.2