Bug 14444 java editor refers to internal jcore classes
ClassFileEditor CompilationUnitDocumentProvider JavaMarkerAnnotation
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitDocumentProvider.java
private IDocument internalGetDocument(IFileEditorInput input) throws CoreException {
				IDocument document= getDocument(input);
				if (document != null)
					return document;
				return CompilationUnitDocumentProvider.this.createDocument(input);
			}
			
			public IBuffer createBuffer(IOpenable owner) {
				if (owner instanceof ICompilationUnit) {
					
					ICompilationUnit unit= (ICompilationUnit) owner;
					
					try {