Bug 32893 Workspace Compatibility Problems 2.0 -> 2.1
Build 2.1 RC1 This PR collects problems related to opening a 2.0 workspace with 2.1.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/hover/JavaProblemHover.java
/*
	 * Formats a message as HTML text.
	 */
	private String formatMessage(String message) {
		StringBuffer buffer= new StringBuffer();
		HTMLPrinter.addPageProlog(buffer);
		HTMLPrinter.addParagraph(buffer, HTMLPrinter.convertToHTMLContent(message));
		HTMLPrinter.addPageEpilog(buffer);
		return buffer.toString();
	}
	
	/*
	 * @see ITextHover#getHoverInfo(ITextViewer, IRegion)
	 */
	public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
		
		if (getEditor() == null)
			return null;
			
		IDocumentProvider provider= JavaPlugin.getDefault().getCompilationUnitDocumentProvider();
		IAnnotationModel model= provider.getAnnotationModel(getEditor().getEditorInput());