Fehler: Ein JNI-Fehler ist aufgetreten (javax.mail.jar)

Question

Ich versuche, Gmail-Nachrichten mit showmsg.java im Javamail-Beispielpaket zu lesen, und ich erhalte diesen Fehler, wenn ich ihn ausführe. Das Programm kompiliert aber gut.

Hier ist die Fehlermeldung:

Error: A JNI error has occurred, please check your installation and try again 
Exception in thread "main" java.lang.NoClassDefFoundError: javax/mail/internet/ParseException 
     at java.lang.Class.getDeclaredMethods0(Native Method) 
     at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 
     at java.lang.Class.privateGetMethodRecursive(Class.java:3048) 
     at java.lang.Class.getMethod0(Class.java:3018) 
     at java.lang.Class.getMethod(Class.java:1784) 
     at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) 
     at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) 
Caused by: java.lang.ClassNotFoundException: javax.mail.internet.ParseException 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
     ... 7 more 

Hier ist der Code:

import java.util.*; 
import java.io.*; 
import javax.mail.*; 
import javax.mail.event.*; 
import javax.mail.internet.*; 

/* 
* Demo app that exercises the Message interfaces. 
* Show information about and contents of messages. 
* 
* @author John Mani 
* @author Bill Shannon 
*/ 

public class msgshow { 

    static String protocol; 
    static String host = null; 
    static String user = null; 
    static String password = null; 
    static String mbox = null; 
    static String url = null; 
    static int port = -1; 
    static boolean verbose = false; 
    static boolean debug = false; 
    static boolean showStructure = false; 
    static boolean showMessage = false; 
    static boolean showAlert = false; 
    static boolean saveAttachments = false; 
    static int attnum = 1; 

    public static void main(String argv[]) { 
     int optind; 
     InputStream msgStream = System.in; 

     for (optind = 0; optind < argv.length; optind++) { 
      if (argv[optind].equals("-T")) { 
       protocol = argv[++optind]; 
      } else if (argv[optind].equals("-H")) { 
       host = argv[++optind]; 
      } else if (argv[optind].equals("-U")) { 
       user = argv[++optind]; 
      } else if (argv[optind].equals("-P")) { 
       password = argv[++optind]; 
      } else if (argv[optind].equals("-v")) { 
       verbose = true; 
      } else if (argv[optind].equals("-D")) { 
       debug = true; 
      } else if (argv[optind].equals("-f")) { 
       mbox = argv[++optind]; 
      } else if (argv[optind].equals("-L")) { 
       url = argv[++optind]; 
      } else if (argv[optind].equals("-p")) { 
       port = Integer.parseInt(argv[++optind]); 
      } else if (argv[optind].equals("-s")) { 
       showStructure = true; 
      } else if (argv[optind].equals("-S")) { 
       saveAttachments = true; 
      } else if (argv[optind].equals("-m")) { 
       showMessage = true; 
      } else if (argv[optind].equals("-a")) { 
       showAlert = true; 
      } else if (argv[optind].equals("--")) { 
       optind++; 
       break; 
      } else if (argv[optind].startsWith("-")) { 
       System.out.println(
"Usage: msgshow [-L url] [-T protocol] [-H host] [-p port] [-U user]"); 
       System.out.println(
"\t[-P password] [-f mailbox] [msgnum ...] [-v] [-D] [-s] [-S] [-a]"); 
       System.out.println(
"or  msgshow -m [-v] [-D] [-s] [-S] [-f msg-file]"); 
       System.exit(1); 
      } else { 
       break; 
      } 
     } 

     try { 
      // Get a Properties object 
      Properties props = System.getProperties(); 

      // Get a Session object 
      Session session = Session.getInstance(props, null); 
      session.setDebug(debug); 

      if (showMessage) { 
       MimeMessage msg; 
       if (mbox != null) 
        msg = new MimeMessage(session, 
         new BufferedInputStream(new FileInputStream(mbox))); 
       else 
        msg = new MimeMessage(session, msgStream); 
       dumpPart(msg); 
       System.exit(0); 
      } 

      // Get a Store object 
      Store store = null; 
      if (url != null) { 
       URLName urln = new URLName(url); 
       store = session.getStore(urln); 
       if (showAlert) { 
        store.addStoreListener(new StoreListener() { 
         public void notification(StoreEvent e) { 
          String s; 
          if (e.getMessageType() == StoreEvent.ALERT) 
           s = "ALERT: "; 
          else 
           s = "NOTICE: "; 
          System.out.println(s + e.getMessage()); 
         } 
        }); 
       } 
       store.connect(); 
      } else { 
       if (protocol != null) 
        store = session.getStore(protocol); 
       else 
        store = session.getStore(); 

       // Connect 
       if (host != null || user != null || password != null) 
        store.connect(host, port, user, password); 
       else 
        store.connect(); 
      } 


      // Open the Folder 

      Folder folder = store.getDefaultFolder(); 
      if (folder == null) { 
       System.out.println("No default folder"); 
       System.exit(1); 
      } 

      if (mbox == null) 
       mbox = "INBOX"; 
      folder = folder.getFolder(mbox); 
      if (folder == null) { 
       System.out.println("Invalid folder"); 
       System.exit(1); 
      } 

      // try to open read/write and if that fails try read-only 
      try { 
       folder.open(Folder.READ_WRITE); 
      } catch (MessagingException ex) { 
       folder.open(Folder.READ_ONLY); 
      } 
      int totalMessages = folder.getMessageCount(); 

      if (totalMessages == 0) { 
       System.out.println("Empty folder"); 
       folder.close(false); 
       store.close(); 
       System.exit(1); 
      } 

      if (verbose) { 
       int newMessages = folder.getNewMessageCount(); 
       System.out.println("Total messages = " + totalMessages); 
       System.out.println("New messages = " + newMessages); 
       System.out.println("-------------------------------"); 
      } 

      if (optind >= argv.length) { 
       // Attributes & Flags for all messages .. 
       Message[] msgs = folder.getMessages(); 

       // Use a suitable FetchProfile 
       FetchProfile fp = new FetchProfile(); 
       fp.add(FetchProfile.Item.ENVELOPE); 
       fp.add(FetchProfile.Item.FLAGS); 
       fp.add("X-Mailer"); 
       folder.fetch(msgs, fp); 

       for (int i = 0; i < msgs.length; i++) { 
        System.out.println("--------------------------"); 
        System.out.println("MESSAGE #" + (i + 1) + ":"); 
        dumpEnvelope(msgs[i]); 
        // dumpPart(msgs[i]); 
       } 
      } else { 
       while (optind < argv.length) { 
        int msgnum = Integer.parseInt(argv[optind++]); 
        System.out.println("Getting message number: " + msgnum); 
        Message m = null; 

        try { 
         m = folder.getMessage(msgnum); 
         dumpPart(m); 
        } catch (IndexOutOfBoundsException iex) { 
         System.out.println("Message number out of range"); 
        } 
       } 
      } 

      folder.close(false); 
      store.close(); 
     } catch (Exception ex) { 
      System.out.println("Oops, got exception! " + ex.getMessage()); 
      ex.printStackTrace(); 
      System.exit(1); 
     } 
     System.exit(0); 
    } 

    public static void dumpPart(Part p) throws Exception { 
     if (p instanceof Message) 
      dumpEnvelope((Message)p); 

     /** Dump input stream .. 

     InputStream is = p.getInputStream(); 
     // If "is" is not already buffered, wrap a BufferedInputStream 
     // around it. 
     if (!(is instanceof BufferedInputStream)) 
      is = new BufferedInputStream(is); 
     int c; 
     while ((c = is.read()) != -1) 
      System.out.write(c); 

     **/ 

     String ct = p.getContentType(); 
     try { 
      pr("CONTENT-TYPE: " + (new ContentType(ct)).toString()); 
     } catch (ParseException pex) { 
      pr("BAD CONTENT-TYPE: " + ct); 
     } 
     String filename = p.getFileName(); 
     if (filename != null) 
      pr("FILENAME: " + filename); 

     /* 
     * Using isMimeType to determine the content type avoids 
     * fetching the actual content data until we need it. 
     */ 
     if (p.isMimeType("text/plain")) { 
      pr("This is plain text"); 
      pr("---------------------------"); 
      if (!showStructure && !saveAttachments) 
       System.out.println((String)p.getContent()); 
     } else if (p.isMimeType("multipart/*")) { 
      pr("This is a Multipart"); 
      pr("---------------------------"); 
      Multipart mp = (Multipart)p.getContent(); 
      level++; 
      int count = mp.getCount(); 
      for (int i = 0; i < count; i++) 
       dumpPart(mp.getBodyPart(i)); 
      level--; 
     } else if (p.isMimeType("message/rfc822")) { 
      pr("This is a Nested Message"); 
      pr("---------------------------"); 
      level++; 
      dumpPart((Part)p.getContent()); 
      level--; 
     } else { 
      if (!showStructure && !saveAttachments) { 
       /* 
       * If we actually want to see the data, and it's not a 
       * MIME type we know, fetch it and check its Java type. 
       */ 
       Object o = p.getContent(); 
       if (o instanceof String) { 
        pr("This is a string"); 
        pr("---------------------------"); 
        System.out.println((String)o); 
       } else if (o instanceof InputStream) { 
        pr("This is just an input stream"); 
        pr("---------------------------"); 
        InputStream is = (InputStream)o; 
        int c; 
        while ((c = is.read()) != -1) 
         System.out.write(c); 
       } else { 
        pr("This is an unknown type"); 
        pr("---------------------------"); 
        pr(o.toString()); 
       } 
      } else { 
       // just a separator 
       pr("---------------------------"); 
      } 
     } 

     /* 
     * If we're saving attachments, write out anything that 
     * looks like an attachment into an appropriately named 
     * file. Don't overwrite existing files to prevent 
     * mistakes. 
     */ 
     if (saveAttachments && level != 0 && p instanceof MimeBodyPart && 
       !p.isMimeType("multipart/*")) { 
      String disp = p.getDisposition(); 
      // many mailers don't include a Content-Disposition 
      if (disp == null || disp.equalsIgnoreCase(Part.ATTACHMENT)) { 
       if (filename == null) 
        filename = "Attachment" + attnum++; 
       pr("Saving attachment to file " + filename); 
       try { 
        File f = new File(filename); 
        if (f.exists()) 
         // XXX - could try a series of names 
         throw new IOException("file exists"); 
        ((MimeBodyPart)p).saveFile(f); 
       } catch (IOException ex) { 
        pr("Failed to save attachment: " + ex); 
       } 
       pr("---------------------------"); 
      } 
     } 
    } 

    public static void dumpEnvelope(Message m) throws Exception { 
     pr("This is the message envelope"); 
     pr("---------------------------"); 
     Address[] a; 
     // FROM 
     if ((a = m.getFrom()) != null) { 
      for (int j = 0; j < a.length; j++) 
       pr("FROM: " + a[j].toString()); 
     } 

     // REPLY TO 
     if ((a = m.getReplyTo()) != null) { 
      for (int j = 0; j < a.length; j++) 
       pr("REPLY TO: " + a[j].toString()); 
     } 

     // TO 
     if ((a = m.getRecipients(Message.RecipientType.TO)) != null) { 
      for (int j = 0; j < a.length; j++) { 
       pr("TO: " + a[j].toString()); 
       InternetAddress ia = (InternetAddress)a[j]; 
       if (ia.isGroup()) { 
        InternetAddress[] aa = ia.getGroup(false); 
        for (int k = 0; k < aa.length; k++) 
         pr(" GROUP: " + aa[k].toString()); 
       } 
      } 
     } 

     // SUBJECT 
     pr("SUBJECT: " + m.getSubject()); 

     // DATE 
     Date d = m.getSentDate(); 
     pr("SendDate: " + 
      (d != null ? d.toString() : "UNKNOWN")); 

     // FLAGS 
     Flags flags = m.getFlags(); 
     StringBuffer sb = new StringBuffer(); 
     Flags.Flag[] sf = flags.getSystemFlags(); // get the system flags 

     boolean first = true; 
     for (int i = 0; i < sf.length; i++) { 
      String s; 
      Flags.Flag f = sf[i]; 
      if (f == Flags.Flag.ANSWERED) 
       s = "\\Answered"; 
      else if (f == Flags.Flag.DELETED) 
       s = "\\Deleted"; 
      else if (f == Flags.Flag.DRAFT) 
       s = "\\Draft"; 
      else if (f == Flags.Flag.FLAGGED) 
       s = "\\Flagged"; 
      else if (f == Flags.Flag.RECENT) 
       s = "\\Recent"; 
      else if (f == Flags.Flag.SEEN) 
       s = "\\Seen"; 
      else 
       continue;  // skip it 
      if (first) 
       first = false; 
      else 
       sb.append(' '); 
      sb.append(s); 
     } 

     String[] uf = flags.getUserFlags(); // get the user flag strings 
     for (int i = 0; i < uf.length; i++) { 
      if (first) 
       first = false; 
      else 
       sb.append(' '); 
      sb.append(uf[i]); 
     } 
     pr("FLAGS: " + sb.toString()); 

     // X-MAILER 
     String[] hdrs = m.getHeader("X-Mailer"); 
     if (hdrs != null) 
      pr("X-Mailer: " + hdrs[0]); 
     else 
      pr("X-Mailer NOT available"); 
    } 

    static String indentStr = "            "; 
    static int level = 0; 

    /** 
    * Print a, possibly indented, string. 
    */ 
    public static void pr(String s) { 
     if (showStructure) 
      System.out.print(indentStr.substring(0, level * 2)); 
     System.out.println(s); 
    } 
} 

Der Befehl, den ich laufen bin mit ist java msgshow -D -T imaps -H imap.gmail.com -U [USER] -P [PASS] und der Befehl verwende ich es zu kompilieren ist javac -cp ".:./:./lib:./lib/*" msgshow.java. Die javax.mail.jar ist im lib Ordner enthält

Dieses einiger alternativer Code, der viel kürzer ist und erhält die gleichen Fehler:

import java.util.*; 
import java.io.*; 
import javax.mail.*; 
import smtp; 
import imaps; 
//import java.mail.*; 
//import com.sun.mail.*; 

public class AccessGmail { 
     public static void main (String[] args) { 
       Scanner scan = new Scanner(System.in); 
       try 
       { 
         Properties prop = new Properties(); 
         prop.load(new FileInputStream(new File("smtp.properties"))); 
         Session session = Session.getDefaultInstance(prop, null); 

         String pass = scan.next(); 

         Store store = session.getStore("imaps"); 
         store.connect("smtp.gmail.com","shane.l.gvoice@gmail.com",pass); 

         Folder inbox = store.getFolder("inbox"); 
         inbox.open(Folder.READ_ONLY); 
         int messageCount = inbox.getMessageCount(); 
         System.out.println("Message Count: "+messageCount); 
       } 
       catch (FileNotFoundException e){} 
       catch (IOException e){} 
       catch(NoSuchProviderException e){} 
       catch(MessagingException e){} 
     } 
} 

Answer 1

Sie Einstellung nicht CLASSPATH, wenn Sie die laufen Programm, so dass es die Datei javax.mail.jar nicht finden kann:

java -cp ".:lib/javax.mail.jar" msgshow -D -T imaps -H imap.gmail.com -U [USER] -P [PASS]