<variable name="outFormatDate" class="java.text.SimpleDateFormat" resetType="Report" calculation="Nothing">
    <variableExpression><![CDATA[new java.text.SimpleDateFormat("MMMMM yyyy")]]></variableExpression>
    <initialValueExpression><![CDATA[new java.text.SimpleDateFormat("MMMMM yyyy")]]></initialValueExpression>
</variable>

<textFieldExpression   class="java.lang.String"> 
    <![CDATA["Facturation mois " + $V{outFormatDate}.format(new java.util.Date()) ]]>
</textFieldExpression>
				   

<variable name="inFormatDate" class="java.text.SimpleDateFormat" resetType="Report" calculation="Nothing">
    <variableExpression><![CDATA[new java.text.SimpleDateFormat("dd/MM/yyyy")]]> </variableExpression>
    <initialValueExpression> <![CDATA[new java.text.SimpleDateFormat("dd/MM/yyyy")]]> </initialValueExpression>
</variable>

<textFieldExpression   class="java.lang.String"> 
    <![CDATA[$V{outFormatDate}.format($V{inFormatDate}.parse($F{date}))]]> 
</textFieldExpression>

// Export au format Odt (Open Office)
JROdtExporter exporter = new JROdtExporter();
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);
exporter .exportReport();

new Boolean( ${F1}>=0)

new Boolean( ${F1}<0)

 new java.lang.Integer(  ($F{Champ1}.intValue()) *($F{Champ2}.intValue()) )

Locale.setDefault( new Locale(taLangue) );

File destFile = new File(nomFichier);
JRPdfExporter exporter = new JRPdfExporter();
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
......
exporter.setParameter(
JRPdfExporterParameter.PERMISSIONS, 
new Integer(PdfWriter.AllowCopy | PdfWriter.AllowPrinting|PdfWriter.AllowScreenReaders)
                );
exporter.exportReport();

new Boolean(($V{PAGE_NUMBER}.intValue()!=1) ? true : false )

<barPlot>
     <plot orientation="Horizontal"/>
     ....
</barPlot>

<barPlot>
     <plot orientation="Horizontal"/>
     ....
</barPlot>

(P${St_Com_Bool}==true ? Where Statut_Commmande like "annulée","")

Select * from matable $P!{St_Com}

isIgnorePagination="true"

new DecimalFormat("#,##0.00",new DecimalFormatSymbols(Locale.FRENCH)).format($F{DEVIS_MT})

new DecimalFormat("#,##0.00",new DecimalFormatSymbols(Locale.ENGLISH)).format($F{DEVIS_MT})

// Code de la zone "imprimer si expression" de l'objet saut_de_page

($V{REPORT_COUNT}.intValue() == $P{NB_TAB_LINE_PAGE_1}.intValue() ? Boolean.TRUE : 
  (($V{REPORT_COUNT}.intValue()-$P{NB_TAB_LINE_PAGE_1}.intValue()) % $P{NB_TAB_LINE_PAGE_2}.intValue() == 0 ? Boolean.TRUE : Boolean.FALSE
  )
)

public class NeoJRViewer extends JRViewer {
 
    JasperPrint jasperPrint ;
 
    public NeoJRViewer(JasperPrint jp) {
        super(jp) ;
    }
 
// ON REECRIT LA METHODE initSaveContributors EN COMMENTANT
// LES FORMATS DE SAUVEGARDE QUE L'ON NE VEUT PAS GARDER
 
    @Override
    protected void initSaveContributors() {
        final String[] DEFAULT_CONTRIBUTORS = {
//        "net.sf.jasperreports.view.save.JRPrintSaveContributor",
        "net.sf.jasperreports.view.save.JRPdfSaveContributor"
//        "net.sf.jasperreports.view.save.JRRtfSaveContributor",
//        "net.sf.jasperreports.view.save.JROdtSaveContributor",
//        "net.sf.jasperreports.view.save.JRHtmlSaveContributor",
//        "net.sf.jasperreports.view.save.JRSingleSheetXlsSaveContributor",
//        "net.sf.jasperreports.view.save.JRMultipleSheetsXlsSaveContributor",
//        "net.sf.jasperreports.view.save.JRCsvSaveContributor",
//        "net.sf.jasperreports.view.save.JRXmlSaveContributor",
//        "net.sf.jasperreports.view.save.JREmbeddedImagesXmlSaveContributor"
        };
 
 
// CE BOUT DE CODE PERMET D'INITIALISER LA VARIABLE saveContributors
// CONTENUE DANS JRViewer
        for(int i=0; i<DEFAULT_CONTRIBUTORS.length; i++) {
            try {
            Class saveContribClass = JRClassLoader.loadClassForName(DEFAULT_CONTRIBUTORS[i]) ;
            Constructor constructor = saveContribClass.getConstructor(new Class[]{Locale.class, ResourceBundle.class}) ;
            JRSaveContributor saveContrib = (JRSaveContributor)constructor.newInstance(new Object[]{getLocale(), null}) ;
            saveContributors.add(saveContrib) ;
            } catch (Exception e) {
                System.err.println(e) ;
            }
        }
    }
}

public void viewReport(JasperPrint jasperPrint) {
         this.viewer = new NeoJRViewer(jasperPrint) ;
         this.getContentPane().setLayout(new BorderLayout()) ;
         this.getContentPane().add(viewer) ;
}