getOutputStream() has already been called for this response

user_319274 0
Viewed 237398

I google the error message getOutputStream() has already been called for this response and many people said it is because of the space or newline after <% or %>, but in my code , there is no a space or a newline. I am using tomcat6 on linux.

<%@
    page import="java.servlet.*,
    javax.servlet.http.*,
    java.io.*,
    java.util.*,
    com.lowagie.text.pdf.*,
    com.lowagie.text.*"
    %><%
    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 < bytes.length; i++)
        {
        dataOutput.writeByte(bytes[i]);
        }
    }catch(DocumentException e){
        e.printStackTrace();
    }

%>

~

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)

root cause 

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)
tomcat jsp java
15 Answers

Here is what worked for me in similar case.

After you finish writing into the Servlet OutputStream just call response.sendRedirect("yourPage.jsp");. That would cause initiation of a new request from the browser, therefore avoid writing into the same output stream.

user_13132850

I got the same problem, and I solved just adding "return;" at the end of the FileInputStream.

Here is my JSP

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<%@ page import="java.io.*"%>
<%@ page trimDirectiveWhitespaces="true"%>

<%

 try {
  FileInputStream ficheroInput = new FileInputStream("C:\\export_x_web.pdf");
  int tamanoInput = ficheroInput.available();
  byte[] datosPDF = new byte[tamanoInput];
  ficheroInput.read(datosPDF, 0, tamanoInput);

  response.setHeader("Content-disposition", "inline; filename=export_sise_web.pdf");
  response.setContentType("application/pdf");
  response.setContentLength(tamanoInput);
  response.getOutputStream().write(datosPDF);

  response.getOutputStream().flush();
  response.getOutputStream().close();

  ficheroInput.close();
  return;

 } catch (Exception e) {

 }
%>

</body>
</html>

user_37392580

I didn't use JSP but I had similar error when I was setting response to return JSON object by calling PrintWriter's flush() method or return statement. Previous answer i.e wrapping return-statement into a try-block worked kind of: the error disappeared because return-statement makes method to ignore all code below try-catch, specifically in my case, line redirectStrategy.sendRedirect(request, response, destination_addr_string) which seem to modify the already committed response that causes the error. The simpler solution in my case was just to remove the line and let client app to take care of the redirection.

user_93980400

I faced the same issue, this issue occurs because Java gives an error if you use multiple writer/output stream using getWriter()/getOutputStream().

For me the issue was I was using @Logging and @RestLogging, avoid using extra annotation while calling the API.

user_128789820

In my case I am using the out object for printing the code It shows the error like getOutputStream() has already called for the response. For resolving this error, I am initializing another PrintWriter object out1 and use that for printing the code That's working perfectly. Eg. Before: out.println("Error"); After: PrintWriter out1 = response.getWriter(); out1.println("Success");

user_155912050
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