[iText-questions] Why? getOutputStream() has already been called for this response

[David]

I have seen several posts for this but none resolve my issue.

First, my code:

<%@
page import="java.io.*,
                         com.lowagie.text.*,
                         com.lowagie.text.pdf.*,
                         com.lowagie.text.html.*,
                         java.awt.Color"
%>
<%
response.setContentType( "application/pdf" );
// creation of the document with a certain size and certain margins

Document document = new Document(PageSize.LETTER, 50, 50, 50, 50);

try {

// creation of the different writers

        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        PdfWriter.getInstance(document, buffer);
// we add some meta information to the document

	document.addSubject("Current inventory as of ");

	document.open();

	Table datatable = new Table(7);

        datatable.setPadding(4);
        datatable.setSpacing(0);
        datatable.setBorder(Rectangle.NO_BORDER);
        datatable.setWidths( new int[] { 10, 10, 10, 10, 10, 10, 60 } );
        datatable.setWidth(120);
	Image jpg = 
Image.getInstance("/home/workbench/web_sites/paragonis/images/PARAGONlogo.gif");
	jpg.setBorder(Rectangle.NO_BORDER);
	jpg.scalePercent(50);

        Cell cell = new Cell();
        cell.add(jpg);
        cell.setHorizontalAlignment(Element.ALIGN_LEFT);
        cell.setLeading(30);
        cell.setColspan(5);
        cell.setBorder(Rectangle.NO_BORDER);
        datatable.addCell(cell);
        cell = new Cell("PO Box 1234   Hometown, St  27282-1234\n" +
                                        "Phone: 336-555-1212\nContact: David");
        cell.setHorizontalAlignment(Element.ALIGN_RIGHT);
        cell.setColspan(2);
        cell.setBorder(Rectangle.NO_BORDER);
        datatable.addCell(cell);
        datatable.setDefaultCellBorder(Rectangle.BOTTOM);
        datatable.setDefaultCellBorderColor(new Color(0x33, 0x33, 0x33));
        datatable.setDefaultCellBorderWidth(2);
        datatable.setDefaultHorizontalAlignment(Element.ALIGN_CENTER);
	datatable.addCell(new Phrase("Receipt Date", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));
	datatable.addCell(new Phrase("Type", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));
	datatable.addCell(new Phrase("Make", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));
	datatable.addCell(new Phrase("Model", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));
	datatable.addCell(new Phrase("Meter", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));

	datatable.setDefaultColspan(2);
	datatable.setDefaultHorizontalAlignment(Element.ALIGN_LEFT);
	datatable.addCell(new Phrase("Description", 
FontFactory.getFont(FontFactory.HELVETICA, 12, Font.BOLD)));

// this is the end of the table header
        datatable.endHeaders();
    Cell commonCell = new Cell();
        commonCell.setVerticalAlignment(Element.ALIGN_TOP);
        commonCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        commonCell.setColspan(1);
//      commonCell.setRowspan(2);
        commonCell.setNoWrap(true);
        Cell singleLineCell = new Cell();
        singleLineCell.setVerticalAlignment(Element.ALIGN_TOP);
        singleLineCell.setHorizontalAlignment(Element.ALIGN_LEFT);
        singleLineCell.setColspan(1);
        singleLineCell.setRowspan(1);
        singleLineCell.setNoWrap(false);
        datatable.setDefaultColspan(1);
        datatable.setDefaultCellBorderWidth(1);
        datatable.setDefaultRowspan(1);
	for (int i = 1; i < 30; i++) {

                datatable.setDefaultLayout(commonCell);
                datatable.addCell("12312000");
//              datatable.addCell("Duplicator");
                datatable.addCell("Gestetner");
                datatable.addCell("FS 9999B");
                datatable.addCell("9999999");
                datatable.setDefaultLayout(singleLineCell);
                datatable.addCell("Accessories");
                datatable.addCell("This is a long description of the accessories");
        }
	document.add(datatable);

// we close the document

	document.close();

// step 6: we output the writer as bytes to the response output
        DataOutput output = new DataOutputStream( response.getOutputStream() );
        byte[] bytes = buffer.toByteArray();
        response.setContentLength(bytes.length);
        for( int i = 0; i < bytes.length; i++ ) { output.writeByte( bytes[i] ); }
} catch(Exception e) {
        out.print("Exception: " + e.getClass().getName() + ", " + e.getMessage());
}
%>
Now this code as presented work just like it is supposed to.  However, 
if you uncomment the datatable.addCell("Duplicator"); line, the error 
posted in the subject is thrown.  Why? and what do I do to fix it?  I 
don't see what is happening on that line that makes a difference.

Thank you for your help in advance.





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