Java EE (Java Enterprise Edition) General Discussion

In our requirement we need to display the images on a JSP and these images are stored in database. I can get the image from database uwing rs.getBinaryStream() and I can see the image on the jsp page.
but I get the exceptions on server console

java.lang.IllegalStateException: Cannot forward. Response already committed.

and on jsp I see two kinds of exception

  1)   Original Exception:
        Error Message: Cannot forward. Response already committed.

    2)  Error Page Exception:
         Error Message: SRVE0199E: OutputStream already obtained
         Error Code: 0

Servlet code :

                       ResultSet rs =stmt.executeQuery("select Q1IMG from Q1A1 where Q1A1='qw1'");
	                String imgLen="";
	               if(rs.next()){
	      	               imgLen = rs.getString(1);  
	                 }  
		        rs =stmt.executeQuery("select Q1IMG from Q1A1 where Q1A1='qw1'");
			if(rs.next()) { 
			int len = imgLen.length();
		        byte [] rb = new byte[len];
		        InputStream readImg = rs.getBinaryStream(1);
		        int index=readImg.read(rb, 0, len);  
		        log.debug("index "+index);
		        rs.close();
		        response.getOutputStream().write(rb);
		        response.getOutputStream().flush();
		}

what could be the reason? how we can avoid them?
could some one please give me solution.

Thanks
Sumant