package com.mycompany.reports;

import com.mycompany.sample6.CityVO;
import com.mycompany.sample6.Mapping;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.type.OrientationEnum;

@WebServlet(name = "GetReport", urlPatterns = {"/GetReport"})
public class GetReport extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("application/pdf");
        ServletOutputStream servletOutputStream = response.getOutputStream();
        HttpSession session = request.getSession(false);
        File reportFile = null;
         HashMap<String, Object> parameterMap = new HashMap<String, Object>();
         reportFile= new File("D:/zia/report1.jasper");
          try {
              List<CityVO> cityList=(List<CityVO>)session.getAttribute("cityListReport");
          JRBeanCollectionDataSource dataSource = new JRBeanCollectionDataSource(cityList);
            JasperPrint jasperPrint =  JasperFillManager.fillReport(reportFile.getPath(),parameterMap,dataSource);
            jasperPrint.setOrientation(OrientationEnum.PORTRAIT);
            final JRPdfExporter pdfExporter = new JRPdfExporter();
            pdfExporter.setParameter(JRExporterParameter.CHARACTER_ENCODING, "UTF-8");
            pdfExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            pdfExporter.setParameter(JRExporterParameter.OUTPUT_STREAM, servletOutputStream);
            pdfExporter.exportReport();
        } catch (Exception e) {
            StringWriter stringWriter = new StringWriter();
            PrintWriter printWriter = new PrintWriter(stringWriter);
            e.printStackTrace(printWriter);
            response.setContentType("text/plain");
            response.getOutputStream().print(stringWriter.toString());
        }finally{
             servletOutputStream.flush();
             servletOutputStream.close();
        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

public String getCityList() {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "mtxymn", "ys$mtx_2010#xtm1sys");
            pstmt = conn.prepareStatement("Select * from gen_cities");
            cityList = new ArrayList<CityVO>();
            ResultSet rset = pstmt.executeQuery();
            while (rset.next()) {
                CityVO city = new CityVO();
                city.setCityAdes(rset.getString("CITY_ADES"));
                city.setCityEdes(rset.getString("CITY_EDES"));
                city.setCityNo(rset.getInt("CITY_NO"));
                city.setCitySer(rset.getInt("CITY_SER"));
                city.setCntryNo(rset.getString("CNTRY_NO"));
                cityList.add(city);
            }
            if (cityList != null && cityList.size() > 0) {
                JSFUtils.storeOnSession("cityListReport", cityList);
            } else {
                JSFUtils.addFacesErrorMessage(JSFUtils.getStringFromBundle("CANNOT_FIND_DATA"));
            }
        } catch (SQLException | ClassNotFoundException ex) {
            Logger.getLogger(Mapping.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }

<script type="text/javascript">

            function poponload()
            {
                var link = window.location.protocol + "//" + window.location.host + "/" + "sample6" + "/" + "sec" + "/" + "GetReport.pdf";

                testwindow = window.open(link, "mywindow", "location=1,status=1,scrollbars=1,width=800,height=500");
                testwindow.moveTo(50, 50);
            }
        </script>
    <p:commandButton id="showReport" value="show Report"  actionListener="#{mapping.cityList}" icon="ui-icon-print" iconPos="right" immediate="true" ajax="true" oncomplete="poponload()" />

18-Feb-2016 09:42:47.383 SEVERE [http-nio-9999-exec-22] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [GetReport] in context with path [/sample6] threw exception [Servlet execution threw an exception] with root cause
 java.lang.NoSuchMethodError: com.mycompany.sample6.Mapping.getCityList()Ljava/util/ArrayList;

18-Feb-2016 12:19:55.697 SEVERE [http-nio-9999-exec-13] com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError javax.el.MethodNotFoundException: Method not found: com.mycompany.sample6.Mapping@162e4f8f.cityList()