Grails Jasper plugins - direct pdf output

I use jasper plugin (http://grails.org/plugin/jasper) in my grails application. I want to send direct pdf file to the browser.

package com.jasper

import org.codehaus.groovy.grails.plugins.jasper.JasperExportFormat
import org.codehaus.groovy.grails.plugins.jasper.JasperReportDef

class LabController {

    def jasperService
    def directpdf() {

        def reportDef = new JasperReportDef(name:'mbarang.jrxml', fileFormat:JasperExportFormat.PDF_FORMAT)
        response.contentType = 'application/pdf'
        response.outputStream << jasperService.generateReport(reportDef).toByteArray()
        return(false);
    }
}