Potential Resource Leak Error Being Thrown

The code below throws the error 'Potential resource leak. respOut may not be closed at this location ' on the line indicated.

Can you help me figure out why?

	@RequestMapping(value = "/getProgressNotes.htm", method = RequestMethod.GET)
	@ResponseBody
	public void getProgressNotes(HttpServletRequest request,
			HttpServletResponse response, @RequestParam Long noteId) throws PMRUserException {
		byte[] byteArray = iprogressnotesService.getProgressNotes(noteId); 
		OutputStream respOut = null;
		try{
		     response.setContentType("application/pdf");
		     response.setContentLength(byteArray.length );
		     respOut = response.getOutputStream(); 
		    respOut.write(byteArray);
		    respOut.flush();
		    respOut.close();

		} catch (Exception e) {
			throw new CustomUserException(e.getMessage(),e);
		}finally{
			try {
				if(respOut!=null){
					respOut.close();
				}
			} catch (IOException e) {
				throw new CustomUserException(e.getMessage(),e);   //ERROR THROWN HERE
			}
		}
		
	}

Select allOpen in new window