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Thread: what's wrong with this code

  1. #1
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    Default what's wrong with this code

    import javax.mail.*;
     
    import javax.mail.internet.*;
    import java.util.Properties;
    public class Access
    {
    public static void main (String args[])
    {
    int argc = args.length;
    if (argc != 4)
    {
    System.out.println ("Syntax :");
    System.out.println (
    "java Access protocol host username password");
    return;
    }
    String protocol = args[0];
    String host = args[1];
    String username = args[2];
    String password = args[3];
    try
    {
    Properties props=System.getProperties();
     
    props.setProperty("mail.store.protocol", "imaps");
    props.setProperty("mail.imap.connectiontimeout", "50000");
    props.setProperty("mail.imap.timeout", "50000");
    Session mySession = Session.getDefaultInstance(props, null);
     
    Store myStore = mySession.getStore(protocol);
    myStore.connect (host, username, password);
    /***** exception is thrown here
    and exception is 
     
     
    javax.mail.MessagingException: Connection timed out: connect;
      nested exception is:
            java.net.ConnectException: Connection timed out: connect
            at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
            at javax.mail.Service.connect(Service.java:295)
            at javax.mail.Service.connect(Service.java:176)
            at Access.main(Access.java:279)
    Caused by: java.net.ConnectException: Connection timed out: connect
            at java.net.PlainSocketImpl.socketConnect(Native Method)
            at java.net.PlainSocketImpl.doConnect(Unknown Source)
            at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
            at java.net.PlainSocketImpl.connect(Unknown Source)
            at java.net.SocksSocketImpl.connect(Unknown Source)
            at java.net.Socket.connect(Unknown Source)
            at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:286)
            at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
            at com.sun.mail.iap.Protocol.<init>(Protocol.java:113)
            at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:110)
     
            at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:632)
    ******/
     
    }
    catch (MessagingException exe)
    {
    	exe.printStackTrace();
    }
    catch (Exception ex)
    {
    	ex.printStackTrace();
    }
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: what's wrong with this code

    What would the response be if the server didn't exist or it didn't want to communicate with you?

  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: what's wrong with this code

    Is there a question here?

    If it's regarding javax.mail.MessagingException: Connection timed out: connect; then it's self-explanatory.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  4. #4
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    Default what's wrong with this code

    /****************************
    this code is for connecting to gmail through java program
    this is throwing ConnectedTimeout exception at the commented place 
    please give some suggestions to solve this
    ********************************/
     
    import javax.mail.*;
    import javax.mail.internet.*;
    import java.util.Properties;
    public class Access
    {
    public static void main (String args[])
    {
    int argc = args.length;
     
    if (argc != 4)
    {
    System.out.println ("Syntax :");
    System.out.println (
    "java Access protocol host username password");
    return;
    }
    String protocol = args[0];
    String host = args[1];
    String username = args[2];
    String password = args[3];
    try
    {
     
    Properties props=System.getProperties();
    props.setProperty("mail.store.protocol", "imaps");
    props.setProperty("mail.imap.timeout", "50000");
    Session mySession = Session.getDefaultInstance(props, null);
     
     
    Store myStore = mySession.getStore(protocol);
    myStore.connect (host, username, password);
    /****************************************************
     
    at this line
    throwing connection timedout exception
    host,user password and iinternet coneection are provided correctly
    *******************************************************/
     
    Folder myFolder = myStore.getFolder("INBOX");
    if (myFolder == null)
    {
    System.err.println ("No default folder available");
    return;
    }
    System.out.println ("Accessing " +
    myFolder.getFullName() + " folder");
     
    myFolder.open(Folder.READ_ONLY);
    int messagecount = myFolder.getMessageCount();
    System.out.println (myFolder.getFullName() + " has "
    + messagecount +
    " messages.");
    Message[] message = myFolder.getMessages ();
    for (int i = 0; i < message.length; i++)
    {
    Address[] fromAddr = message[i].getFrom();
    System.out.println (fromAddr[0] + ":" +
    message[i].getSubject());
    }
    myFolder.close(false);
    }
    catch (MessagingException me)
    {
    System.err.println ("Messaging failure : " + me);
    }
    catch (Exception ex)
    {
    System.err.println ("Failure : " + ex);
    }
    }
    }

  5. #5
    mmm.. coffee JavaPF's Avatar
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    Default Re: what's wrong with this code

    Please don't duplicate threads. I have merged it with this original thread.

    So you have posted code which looks pretty much the same to me? You also have given zero information about your problem.

    If you are getting a connection timeout, it would suggest that the server/username/password details are wrong.
    Are you sending these details as command line arguments when you compile the code?

    If you use the Eclipse IDE, see - How to Send command line arguments in Eclipse?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  6. #6
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    Default Re: what's wrong with this code

    It looks like you are attempting to connect with null as the Authenticator. It should be throwing an AuthenticationFailedException which would be picked up by the catch exception block at the end. For the record; this is not a good idea because it can introduce bugs that are nearly impossible to track down. Try to catch the specific exception that the code may throw (your IDE will help you with this). I do not know why it would be timing out instead of throwing an exception but at a guess I would say it has something to do with google's security system. It would make sense for a massive system like gmail to timeout a bad authentication because it would make it harder to brute force someone's password (this is a un-educated guess mind you).

    You can read up on the Authenticator here.

    As a side note, your comment states: "host,user password and iinternet coneection are provided correctly". Assumptions are the cause of all f***-ups and I do not see any code that checks these parameters and fails gracefully for bad input. Given that you failed to spell 'internet' and 'connection' correctly it stands to reason you are not passing the correct parameters as command line arguments.

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