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A colleague of mine tried to open a 18Gb file inside out RCP application and got this: java.lang.NegativeArraySizeException at org.netbeans.modules.editor.lib2.document.ReadWriteUtils.read(ReadWriteUtils.java:74) at org.netbeans.editor.BaseDocument.read(BaseDocument.java:1436) at org.netbeans.editor.BaseKit.read(BaseKit.java:668) at org.openide.text.DataEditorSupport.loadFromStreamToKit(DataEditorSupport.java:492) at org.openide.text.DocumentOpenClose$DocumentLoad.atomicLockedRun(DocumentOpenClose.java:764) at org.openide.text.DocumentOpenClose$DocumentLoad.run(DocumentOpenClose.java:615) at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:323) at org.openide.text.NbDocument.runAtomic(NbDocument.java:436) at org.openide.text.DocumentOpenClose$DocumentLoad.run(DocumentOpenClose.java:655) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)