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POgetOutputStream() has already been called for this response
 

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    <p>I google the error message <code>getOutputStream() has already been called for this response</code> and many people said it is because of the space or newline after <code>&lt;%</code> or <code>%&gt;</code>, but in my code , there is no a space or a newline. I am using tomcat6 on linux.</p> <pre><code>&lt;%@ page import="java.servlet.*, javax.servlet.http.*, java.io.*, java.util.*, com.lowagie.text.pdf.*, com.lowagie.text.*" %&gt;&lt;% response.setContentType("application/pdf"); Document document = new Document(); try{ ByteArrayOutputStream buffer = new ByteArrayOutputStream(); PdfWriter.getInstance(document, buffer); document.open(); PdfPTable table = new PdfPTable(2); table.addCell("1"); table.addCell("2"); table.addCell("3"); table.addCell("4"); table.addCell("5"); table.addCell("6"); document.add(table); document.close(); DataOutput dataOutput = new DataOutputStream(response.getOutputStream()); byte[] bytes = buffer.toByteArray(); response.setContentLength(bytes.length); for(int i = 0; i &lt; bytes.length; i++) { dataOutput.writeByte(bytes[i]); } }catch(DocumentException e){ e.printStackTrace(); } %&gt; </code></pre> <p>~</p> <pre><code>org.apache.jasper.JasperException: java.lang.IllegalStateException: getOutputStream() has already been called for this response org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) </code></pre> <p>root cause </p> <pre><code>java.lang.IllegalStateException: getOutputStream() has already been called for this response org.apache.catalina.connector.Response.getWriter(Response.java:610) org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198) org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125) org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118) org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:188) org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118) org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77) org.apache.jsp.Account.Domain.testPDF_jsp._jspService(testPDF_jsp.java:94) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) </code></pre>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. USSouthsouth
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      1. POgetOutputStream() has already been called for this response
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      1. POgetOutputStream() has already been called for this response
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    1. This table or related slice is empty.
 

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