p:media component content not update - jsf

Question

I am using primefaces p:media component to display pdf into my application.When user click on commandButton in view ; I proceed somme task in my managedBean bean to change pdf content ; but I notice that despite of fact that my managedBean method is called and differents values change , My p:media component not updated.
What is the problem??
<h:form id="statistiques" prependId="false">
<h3 class="row header smaller lighter blue">
<span class="col-xs-6"> Statistiques </span><!-- /.col -->
</h3>
<div class="row statistique-form">
<div class="form-group col-sm-2">
<label class="control-label col-xs-12 col-sm-12" for="date-naissance">Période</label>
<div class="col-xs-12 col-sm-12">
<div class="input-group">
<input class="form-control" type="text" name="date-range-picker" id="id-date-range-picker-1" jsf:value="#{statistiqueOneBean.periode}"/>
</div>
</div>
</div>
<div class="form-group col-sm-2">
<label class="control-label col-xs-12 col-sm-12"></label>
<div class="col-xs-12 col-sm-12">
<div class="btn-toolbar btn-opt">
<p:commandButton action="#{statistiqueOneBean.create}" ajax="false" value="Visualiser" id="submit" immediate="true" class="btn btn-warning dropdown-toggle btn-opt-btn" >
</p:commandButton>
</div>
</div>
</div>
<div class="form-group col-sm-2">
<label class="control-label col-xs-12 col-sm-12"></label>
<div class="col-xs-12 col-sm-12">
<div class="btn-toolbar btn-opt">
<p:commandButton id="downloadLinkPdf" ajax="true" immediate="true" value="Download to pdf" class="btn btn-warning dropdown-toggle btn-opt-btn" >
<p:fileDownload value ="#{statistiqueOneBean.pdf}" />
</p:commandButton>
</div>
</div>
</div>
<div class="form-group col-sm-2">
<label class="control-label col-xs-12 col-sm-12"></label>
<div class="col-xs-12 col-sm-12">
<div class="btn-toolbar btn-opt">
<p:commandButton id="downloadLinkWord" ajax="false" immediate="true" value="Download to word" class="btn btn-warning dropdown-toggle btn-opt-btn" >
<p:fileDownload value ="#{statistiqueOneBean.doc}" />
</p:commandButton>
</div>
</div>
</div>
<div class="form-group col-sm-2">
<label class="control-label col-xs-12 col-sm-12"></label>
<div class="col-xs-12 col-sm-12">
<div class="btn-toolbar btn-opt">
<p:commandButton id="downloadLinkExcel" ajax="false" immediate="true" value="Download to excel" class="btn btn-warning dropdown-toggle btn-opt-btn" >
<p:fileDownload value ="#{statistiqueOneBean.xls}"/>
</p:commandButton>
</div>
</div>
</div>
</div>
<hr></hr>
<div class="row">
<div class="panel-group">
<div class="col-md-12 center">
<p:media id="apercu" value="#{statistiqueOneBean.apercu}" player="pdf" width="1024" height="500">
</p:media>
</div>
</div>
</div>
</h:form>
this is my view code source
#Named(value = "statistiqueOneBean")
#SessionScoped
public class StatistiqueOneBean implements Serializable {
private JasperPrint jasperPrint;
private String startDate = "2015-01-01";
private String endDate = "2015-08-25";
private String periode;
private StreamedContent doc;
private StreamedContent xls;
private StreamedContent pdf;
#Inject
StatistiqueFacade statistiqueFacade;
public StatistiqueOneBean() {
}
#PostConstruct
public void init() {
}
public JasperPrint getJasperPrint() {
return jasperPrint;
}
public void setJasperPrint(JasperPrint jasperPrint) {
this.jasperPrint = jasperPrint;
}
public StreamedContent getApercu() {
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
StreamedContent apercu = null;
try {
HashMap parameterMap = new HashMap();
parameterMap.put("dossier_enrol", "2");
parameterMap.put("dossier_traite", "5");
parameterMap.put("duree_moy", "2");
jasperPrint = JasperFillManager.fillReport(reportPath, parameterMap, createReportDataSource(startDate, endDate));
apercu = Reporter.PDFStreamedContent(jasperPrint);
System.out.println(apercu.getStream());
return apercu;
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
return apercu;
}
public String getStartDate() {
return startDate;
}
public void setStartDate(String startDate) {
this.startDate = startDate;
}
public String getEndDate() {
return endDate;
}
public void setEndDate(String endDate) {
this.endDate = endDate;
}
public String getPeriode() {
return periode;
}
public void setPeriode(String periode) {
this.periode = periode;
}
public void create() throws IOException, JRException {
FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put("statistiqueOneBean", null);
System.out.println("change");
System.out.println("change " + RequestListener.periode);
startDate = "2015-01-01";
endDate = "2015-01-01";
}
private JRDataSource createReportDataSource(String startDate, String endDate) {
JRBeanCollectionDataSource datasource = new JRBeanCollectionDataSource(statistiqueFacade.statistiqueOne(startDate, endDate));
/*JRBeanArrayDataSource datasource;
JuridictionStatistiqueOne[] reportRows = initializeBeanArray();
datasource = new JRBeanArrayDataSource(reportRows);*/
return datasource;
}
public void doDocx() throws IOException {
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
try {
jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), createReportDataSource("2015-01-01", "2015-08-25"));
doc = Reporter.DocStreamedContent(jasperPrint);
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
private JuridictionStatistiqueOne[] initializeBeanArray() {
JuridictionStatistiqueOne[] reportRows = new JuridictionStatistiqueOne[4];
reportRows[0] = new JuridictionStatistiqueOne("N263Y", "1", "1", "1", "1", "1");
reportRows[1] = new JuridictionStatistiqueOne("N263Y", "1", "1", "1", "1", "1");
reportRows[2] = new JuridictionStatistiqueOne("N263Y", "1", "1", "1", "1", "1");
reportRows[3] = new JuridictionStatistiqueOne("N263Y", "1", "1", "1", "1", "1");
return reportRows;
}
public void getPDF(String startDate, String endDate) throws IOException {
StreamedContent apercu = null;
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
try {
HashMap parameterMap = new HashMap();
parameterMap.put("dossier_enrol", "2");
parameterMap.put("dossier_traite", "2");
parameterMap.put("duree_moy", "2");
jasperPrint = JasperFillManager.fillReport(reportPath, parameterMap, createReportDataSource(startDate, endDate));
apercu = Reporter.PDFStreamedContent(jasperPrint);
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void doPDF(String startDate, String endDate) throws IOException {
getPDF(startDate, endDate);
}
public StreamedContent getDoc() {
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
try {
jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), createReportDataSource("2015-01-01", "2015-08-25"));
doc = Reporter.DocStreamedContent(jasperPrint);
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
return doc;
}
public StreamedContent getPdf() {
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
try {
jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), createReportDataSource("2015-01-01", "2015-08-25"));
pdf = Reporter.PDFStreamedContent(jasperPrint);
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
return pdf;
}
public StreamedContent getXls() {
String reportPath = "/Users/administrateur/NetBeansProjects/juridictionOne.jasper";
try {
jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), createReportDataSource("2015-01-01", "2015-08-25"));
xls = Reporter.XlsStreamedContent(jasperPrint);
} catch (JRException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(StatistiqueOneBean.class.getName()).log(Level.SEVERE, null, ex);
}
return xls;
}
}
This is my managed bean code source