IMarker marker= file.createMarker("org.eclipse.jdt.ui.tests.testmarker");
IMarker marker= file.createMarker(AddTestMarkersAction.MARKER_TYPE);
	private IMarker createMarker(ICompilationUnit cu, int line, int offset, int len) throws CoreException {		IFile file= (IFile) cu.getResource();		IMarker marker= file.createMarker("org.eclipse.jdt.ui.tests.testmarker");		marker.setAttribute(IMarker.LOCATION, cu.getElementName());		marker.setAttribute(IMarker.MESSAGE, "Test marker");		marker.setAttribute(IMarker.SEVERITY, IMarker.SEVERITY_ERROR);		marker.setAttribute(IMarker.LINE_NUMBER, line);		marker.setAttribute(IMarker.CHAR_START, offset);		marker.setAttribute(IMarker.CHAR_END, offset + len);		return marker;	}