document has no pages with itext

Question

<%
OutputStream output=response.getOutputStream();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "inline; filename=details.pdf");
try{
    Document document = new Document();
PdfWriter writer=PdfWriter.getInstance(document, output);
document.open();
XMLWorkerHelper worker = XMLWorkerHelper.getInstance();
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/a", "root", "root");
Statement st=con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
List arrlist = new ArrayList();
ResultSet rs=st.executeQuery("Select * from user_start1");
 while(rs.next()){
 arrlist.add(rs.getString("data"));
 }  
for(int i=0;i<12;i++){
  String str =(String) arrlist.get(i);
  System.out.println(str); 
  worker.parseXHtml(writer, document, new StringReader("helloworld"));
}
document.close();
writer.flush();
writer.close();
output.close();
}catch(IOException e){e.printStackTrace();} 
%>

throws an error

SEVERE: Servlet.service() for servlet [jsp] in context with path [/chieflegis] threw exception [ExceptionConverter: java.io.IOException: The document has no pages.] with root cause
java.io.IOException: The document has no pages.
    at com.itextpdf.text.pdf.PdfPages.writePageTree(PdfPages.java:113)
    at com.itextpdf.text.pdf.PdfWriter.close(PdfWriter.java:1217)
    at com.itextpdf.text.pdf.PdfDocument.close(PdfDocument.java:807)
    at com.itextpdf.text.Document.close(Document.java:416)
    at org.apache.jsp.print_jsp._jspService(print_jsp.java:112)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

I have used the same xmlworker previously but never had any errors.even hellowworld isnt displayed.please help

Answer 1

Other answers are good. This is an alternative.

In general, to prevent this error which often occurs when the document contains no meaningful data for content, even despite document.open() and document.newPage() having been called, and even after stamping other pages into that document, you can add an empty chunk when the document is opened to ensure the library never considers it empty. e.g.

document.open(); 
document.add(new Chunk("")); // << this will do the trick. 

Answer 2

XMLWorkerHelper.parseXHtml() expects (X)HTML or (X)HTML snippets. Try this:

worker.parseXHtml(writer, document, new StringReader("<p>helloworld</p>"));