JasperReport template = null;

    try {
        template = (JasperReport)JRLoader.loadObject(fs);
        _logger.fine(putUsernameInsideLogger()+"JasperReport file " + template);

    } catch (JRException e) {
        _logger.severe(putUsernameInsideLogger()+"Error during object loading (.jasper file loading) inside insert() method - ReportBean ",e);
    }


    JRParameter[] params = template.getParameters();

    int counter = 1;
            for(JRParameter param : params) {
                System.out.println("PARAMETER nr "+counter++);
              if(!param.isSystemDefined() && param.isForPrompting()){
                  System.out.println("Name: "+param.getName()+ " ,\nDesc: "+param.getDescription()+" ,\nDefaultValueExpr: "+param.getDefaultValueExpression()+" ,\nNestedTypeName: "+param.getNestedTypeName()+ " ,\nValueClassName: "+param.getValueClassName()+" , \nNestedType: "+param.getNestedType());

                  if (param.getValueClassName().equalsIgnoreCase("java.lang.String")){
                  //expose a ui component bind }
                  if (param.getValueClassName().equalsIgnoreCase("java.util.Date")){
                   //same as above}
                  if (param.getValueClassName().equalsIgnoreCase("java.lang.Integer")){
                   //my example
                  RichInputNumberSpinbox ui = new RichInputNumberSpinbox();
                                  ui.setId("rit"+counter);
                                  ui.setLabel(param.getName());
                                  reportFieldsGroupLayout.getChildren().add(ui);}
              }

            }

Map parameters = new HashMap();
        parameters.put("title", uiComponent.getValue()); //get the value from your ui component
        JasperPrint print = null;
            print = JasperFillManager.fillReport(template, parameters, conn);

$P{p_firstname} == null? " All " :
   (
     $P{p_firstname}.isEmpty() ? " All ":
     $P{p_firstname}
   )