ByteArrayOutputStream to PrintWriter (Java Servlet)

Question

Writing generated PDF (ByteArrayOutputStream) in a Servlet to PrintWriter.

I am desperately looking for a way to write a generated PDF file to the response PrintWriter. Since a Filter up the hierarchy chain has already called response.getWriter() I can't get response.getOutputStream().

I do have a ByteArrayOutputStream where I generated the PDF into. Now all I need is a way to output the content of this ByteArrayOutputStream to the PrintWriter. If anyone could give me a helping hand would be very much appreciated!

Solution

If something else has already called getWriter, it may well have already written some text to the response. Besides, PrintWriter is for text - you want to send arbitrary binary data... getOutputStream is definitely the way forward, so I would try to find the filter which has called getWriter and fix that instead.