Here you can find the source of marshall(OutputStream os, JAXBElement element)
private static <S> void marshall(OutputStream os, JAXBElement<S> element) throws Exception
//package com.java2s; /*//w w w .j a va 2 s .com * Copyright ? 2010 Red Hat, Inc. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import java.io.OutputStream; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBElement; import javax.xml.bind.Marshaller; public class Main { private static <S> void marshall(OutputStream os, JAXBElement<S> element) throws Exception { JAXBContext context = JAXBContext.newInstance(element.getDeclaredType()); Marshaller marshaller = context.createMarshaller(); marshaller.marshal(element, os); } }