Bonjour le forum,

j'ai une exception que je n'arrive pas à gérer et je sollicite donc votre aide.
Au démarage de mon appli, je créé/lie un fichier XML qui contient des préférences utilisateurs (Langue, chemin d'accès à des fichiers, mot de passe).
Le cryptage de mon fichier se fait bien mais je n'arrive pas à lire le flux crypté...

Pour ajouter un peu de Sécurité, je crypte ce fichier et lorsque j'essaye de le parser j'ai une exception qui est levée:

23 févr. 2009 15:17:08 snec.XmlConfig <init>
GRAVE: null
org.jdom.input.JDOMParseException: Error on line 1: Premature end of file.
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:468)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:770)
at snec.XmlConfig.<init>(XmlConfig.java:80)
at snec.Initialisations.<init>(Initialisations.java:77)
at snec.Main.main(Main.java:26)
Caused by: org.xml.sax.SAXParseException: Premature end of file.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1058)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
... 4 more
Caused by: org.xml.sax.SAXParseException: Premature end of file.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1058)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:770)
at snec.XmlConfig.<init>(XmlConfig.java:80)
at snec.Initialisations.<init>(Initialisations.java:77)
at snec.Main.main(Main.java:26)
Exception in thread "main" java.lang.NullPointerException
at java.util.ResourceBundle$CacheKey.calculateHashCode(ResourceBundle.java:588)
at java.util.ResourceBundle$CacheKey.<init>(ResourceBundle.java:517)
at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1197)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:787)
at snec.language.Message.<init>(Message.java:21)
at snec.Main.main(Main.java:27)
Java Result: 1
Voila le code de ma classe qui gère ce fichier XML :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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public class XmlConfig {
    /*##################################################################
     * 			Attributes
    ###################################################################*/
 
    //Element ROOT of the xml file.
    static private Element ROOT = new Element("CONFIGURATION");
    //The object Document is the xml file with a ROOT defined previously.
    static private Document XML_CONFIG = new Document(ROOT);
    //Configuration file path
    static String pathConfigFile = "." + File.separator + "config.xml";
    //XML Configuration file
    static File configFile = new File(pathConfigFile);
    //The cipher key allowing the encryption
    private static Cipher encrypt_cipher;
    //The cipher key allowing the decryption
    private static Cipher decrypt_cipher;
    private boolean cryptic;
 
    /*##################################################################
     * 			Constructor
    ###################################################################*/
    /**
     * Constructor which create the new xml file.
     */
    public XmlConfig() {
        //Creation of the instance of saxbuilder.
        SAXBuilder Builder = new SAXBuilder();
        //The parser has to check the DTD defined in the xmlfile. DTD id TO DO !
        //NOW DTD IS NOT CHECK ! Put the validation option to true so as to check it.
        Builder.setValidation(false);
        //Create key to crypt configuration file
        createKeys();
 
        //Create a configuration file if not exist.
        if (!configFile.exists()) {
            createXmlConfig();
        }
        try {
            InputStream inStream = new FileInputStream(pathConfigFile);
            inStream = new CipherInputStream(inStream, decrypt_cipher);
            //Get the XML configuration file
            XML_CONFIG = Builder.build(inStream);
            ROOT = XML_CONFIG.getRootElement();
            inStream.close();
        } catch (JDOMException ex) {
            Logger.getLogger(XmlConfig.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(XmlConfig.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
 
    /**
     * 
     */
    public static void createXmlConfig() {
        PrintWriter out = null;
        try {
            out = new PrintWriter(pathConfigFile, "utf-8");
        } catch (FileNotFoundException ex) {
            Logger.getLogger(XmlConfig.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(XmlConfig.class.getName()).log(Level.SEVERE, null, ex);
        }
        //Language is initialize to Default: English
        out.println("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
        out.println("<CONFIGURATION>");
        out.println("\t<LANGUAGE>snec.language.DefaultMessage</LANGUAGE>");
        out.println("</CONFIGURATION>");
        out.close();
 
        //Open a stream of the config.ini file
        OutputStream outStream;
        try {
            outStream = new FileOutputStream(pathConfigFile);
            outStream = new CipherOutputStream(outStream, encrypt_cipher);
            outStream.close();
        } catch (IOException ex) {
            Logger.getLogger(XmlConfig.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
 
    /**
     * Get a TAG value from XML configuration file
     * @param key   Tag name
     * @return value of the Tag you want to get
     */
    public static String getConfigValue(String key) {
        Element keyTagElement = ROOT.getChild(key);
        List<Element> listTagElement = ROOT.getChildren();
 
        //Get value if TAG exist in configuration file or return null
        if (listTagElement.contains(keyTagElement)) {
            return ROOT.getChild(key).getText();
        } else {
            return null;
        }
    }
 
    public static void modifyConfig(String key, String value) {
 
        Element keyElement = new Element(key);
        Iterator IteratorElement = ROOT.getChildren().iterator();
 
        int i = 0, index = 0;
        boolean found = false;
 
        while (IteratorElement.hasNext() && index == 0) {
            Element el = (Element) IteratorElement.next();
            if (el.getName().equals(key)) {
                IteratorElement.remove();
                index = i;
                found = true;
            }
            i++;
        }
        if (!found) {
            index = ROOT.getChildren().size();
        }
        List<Element> listE = ROOT.getChildren();
        listE.add(index++, keyElement);
        keyElement.setText(value);
 
        saveXml();
    }
 
    /**
     * This class function save the Document in a xml file.
     */
    public static void saveXml() {
        OutputStream outStream;
        try {
            XMLOutputter out = new XMLOutputter(Format.getPrettyFormat());
            FileOutputStream fos = new FileOutputStream(pathConfigFile);
            out.output(XML_CONFIG, fos);
            fos.close();
 
        //Open a stream of the config.ini file
        //outStream = new FileOutputStream(pathConfigFile);
        //outStream = new CipherOutputStream(outStream, encrypt_cipher);
        //outStream.close();
        } catch (java.io.IOException e) {
            e.printStackTrace();
        }
    }
 
    private static void createKeys() {
        String algo = "AES";
        //password = "SneCtEaM15092008"
        byte[] password = new byte[]{0x53, 0x6E, 0x65, 0x43, 0x74, 0x45, 0x61, 0x4D, 0x31, 0x35, 0x30, 0x39, 0x32, 0x30, 0x30, 0x38};
        Key key = new SecretKeySpec(password, algo);
 
        try {
            encrypt_cipher = Cipher.getInstance(algo);
            decrypt_cipher = Cipher.getInstance(algo);
            encrypt_cipher.init(Cipher.ENCRYPT_MODE, key);
            decrypt_cipher.init(Cipher.DECRYPT_MODE, key);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}
Merci d'avance pour le coup de pouce,
Bap