XML : Javafx Gluon save XML File

I Want to save a xml File on Android before I asked a questions how to Get a File now I'm stuck ;( I use Gluon(Netbeans plugin and did already everything what He said: JavaFXPorts(Gluon Plugin) Saving Files on Android

Can you help me I want to save a XML File on Android, this is my Code yet:

      public static void loadConfig() throws JAXBException {          if (ConfigFile.length() != 0) {          JAXBContext jaxbContext = JAXBContext.newInstance(Info.class);          Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();          info = (Info) jaxbUnmarshaller.unmarshal(ConfigFile);      } else {          info = new Info();      }    }    public static void saveConfig() {      try {          info.setAge(10);                       JAXBContext context = JAXBContext.newInstance(Info.class);          Marshaller m = context.createMarshaller();          m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);          m.marshal(info, ConfigFile);      } catch (PropertyException ex) {          Logger.getLogger(STM_WU_LABOR.class.getName()).log(Level.SEVERE, null, ex);      } catch (JAXBException ex) {          Logger.getLogger(STM_WU_LABOR.class.getName()).log(Level.SEVERE, null, ex);      }      }    public File getFile() throws IOException {      File path = PlatformFactory.getPlatform().getPrivateStorage();        return new File(path, "config.xml");  }    

Here is how i call it:

  ConfigFile = getFile();      if (!ConfigFile.exists()) {          ConfigFile.createNewFile();      }    

And this is the Info class:

  package com.stm_wu_labor;    import javax.xml.bind.annotation.XmlRootElement;    /**   *   * @author Merduma   */  @XmlRootElement  public class Info {        Info() {        }        public Info(String gender, int age, int SchoolClass) {          this.gender = gender;          this.age = age;          this.SchoolClass = SchoolClass;      }        private String gender;        public String getGender() {          return gender;      }        public void setGender(String gender) {          this.gender = gender;      }        public int getAge() {          return age;      }        public void setAge(int age) {          this.age = age;      }        public int getSchoolClass() {          return SchoolClass;      }        public void setSchoolClass(int SchoolClass) {          this.SchoolClass = SchoolClass;      }      private int age;      private int SchoolClass;  }    

The Programm is for a school project