<a href="report?id=${a.idabiturient}">PDF</a>

.....
            JRBeanCollectionDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(list);
            System.out.println("nach"); //начало проверки
            String reportPath = FacesContext.getCurrentInstance().getExternalContext().getRealPath("/reports/report.jasper");
            jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), beanCollectionDataSource);

            HttpServletResponse httpServletResponse =
                (HttpServletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();
            System.out.println(httpServletResponse); //для проверки
            System.out.println("kon"); //конец проверки
            httpServletResponse.addHeader("Content-Disposition", "attachment; filename=report.pdf");
            ServletOutputStream servletOutputStream = httpServletResponse.getOutputStream();
            JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);
            FacesContext.getCurrentInstance().responseComplete();
            } catch (IOException ioe) {
            // TODO: Add catch code
            ioe.printStackTrace();
            System.out.println("problema s IOS ---->>> " + ioe);
        } catch (JRException jre) {
            // TODO: Add catch code
            jre.printStackTrace();
            System.out.println("problema s JRException ---->>> " + jre);
        }
.....

net.sf.jasperreports.engine.JRException: java.io.FileNotFoundException: \reports\report.jasper

getServletContext.getRealPath("/reports/report.jasper");

String reportPath = FacesContext.getCurrentInstance().getExternalContext().getRealPath("/reports/report.jasper");

Servlet failed with Exception
java.lang.NullPointerException
	at demo.Report.doGet(Report.java:114)

String reportPath = getServletContext().getRealPath("/reports/report.jasper");

Servlet failed with Exception
java.lang.NullPointerException
	at java.io.File.<init>(File.java:222)
	at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:578)
	at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:930)
	at demo.Report.doGet(Report.java:119)

InputStream reportPath = FacesContext.getCurrentInstance().getExternalContext().getResourceAsStream("/recources/reports/report.jasper");

java.lang.NullPointerException

InputStream reportPath = getServletContext().getResourceAsStream("/recources/reports/report.jasper");

HttpServletResponse httpServletResponse =
                (HttpServletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();

java.lang.NullPointerException

try{
            JRBeanCollectionDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(list);
            System.out.println("nach");
            InputStream reportPath = getServletConfig().getServletContext().getResourceAsStream("/resources/reports/report.jasper");

            System.out.println("---------------------- " + reportPath); 

            jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), beanCollectionDataSource);

            System.out.println("++++++++++++++++ " + jasperPrint); 

//            HttpServletResponse httpServletResponse = 
//                (HttpServletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();

            System.out.println("===================>>>>"+response);
            System.out.println("kon");

            response.setHeader("Cache-Control", "no-cache");
            response.setContentType("application/pdf");
//            response.addHeader("Content-Disposition", "attachment; filename=report.pdf");
            response.addHeader("Content-Disposition", "inline; filename=report.pdf");
            OutputStream servletOutputStream = response.getOutputStream();
            JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);
            servletOutputStream.flush();
            servletOutputStream.close();
}catch(...){...}

java.lang.IllegalStateException: strict servlet API: cannot call getOutputStream() after getWriter()

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd"
              name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20"
              rightMargin="20" topMargin="20" bottomMargin="20" uuid="4cedddd1-22f5-45bc-acb5-c48907b83dd1">
    <property name="ireport.zoom" value="1.0"/>
    <property name="ireport.x" value="0"/>
    <property name="ireport.y" value="0"/>
    <field name="idabiturient" class="java.math.BigDecimal"/>
    <field name="lastName" class="java.lang.String"/>
    <title>
        <band height="33">
            <staticText>
                <reportElement x="226" y="0" width="100" height="20"/>
                <text>
                    <![CDATA[My first report!!!]]>
                </text>
            </staticText>
        </band>
    </title>
    <detail>
        <band height="100">
            <textField>
                <reportElement x="0" y="30" width="50" height="20"/>
                <textFieldExpression class="java.math.BigDecimal">
                    <![CDATA[$F{idabiturient}]]>
                </textFieldExpression>
            </textField>
            <textField>
                <reportElement x="0" y="60" width="150" height="20"/>
                <textFieldExpression class="java.lang.String">
                    <![CDATA[$F{lastName}]]>
                </textFieldExpression>
            </textField>
        </band>
    </detail>
</jasperReport>