Thread: 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();
}
}
}

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

/****************************
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);
}
}
}

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.