java.lang.IllegalStateException: Already using output stream

Question

windchill GUI on client side browser when a user clicks on a button particular pdf file should gets downloaded on his system.I have achieved this by using the following code. ``` <% String pdfname= session.getAttribute("pdfname").toString(); String Pdfpath= session.getAttribute("pdfpath").toString(); File f =new File(Pdfpath); Boolean flag=false; if(f.exists()) { BufferedInputStream filein = null; BufferedOutputStream out2=null; try { File file = new File(Pdfpath);//specify the file path byte b[] = new byte[1048576]; int len = 0; filein = new BufferedInputStream(new FileInputStream(file)); out2=new BufferedOutputStream(response.getOutputStream()); response.setHeader("Content-Length", ""+file.length()); response.setContentType("application/pdf"); response.setHeader("Content-Disposition","attachment;filename="+pdfname); response.setHeader("Content-Transfer-Encoding", "binary"); while ((len = filein.read(b)) > 0) { out2.write(b, 0, len); out.println("Your Pdf Document Is Generated…

Accepted Answer

You cannot use both `getServletOutputStream()` and `getWriter()` in same response.

Coming to your problem. Avoid writing scriptlets in JSP. Whatever you are doing in JSP , implement it in Servlet.

You are calling `response.getOutputStream();` in JSP which is illegal. You should use either `ServletResponse.getOutputStream()` or `ServletResponse.getWriter()`. Since JSP's use ServletResponse.getWriter() by default. You should write to ServletResponse.getWriter() instead ServletResponse.getOutputStream()

This is what Java Doc says :

getOutputStream...

ServletOutputStream getOutputStream() throws IOException

Returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data.

Calling flush() on the ServletOutputStream commits the response. Either this method or getWriter() may be called to write the body, not both.

Returns: a ServletOutputStream for writing binary data Throws: IllegalStateException - if the getWriter method has been called on this response

java.lang.IllegalStateException: Already using output stream

Solution

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