Only 274 mails are coming when using pop3 with java mail

Question

Only 274 mails are coming from GMAIL when using pop3 with java mail. but there are more than 3000 mails.
I'm not getting the reason, code is given below:
public static void main(String[] args) {
        // SUBSTITUTE YOUR ISP's POP3 SERVER HERE!!!
//        String host = "pop.bizmail.yahoo.com";
//        final String user = "[email protected]";
//        final String password = "xxx";
        String host = "pop.gmail.com";
        final String user = "gauravjlj";
        final String password = "xxx";
        String subjectSubstringToSearch = "Test E-Mail through Java";
        try {
             Properties prop = new Properties();
            prop.setProperty("mail.pop3.socketFactory.class",
                                        "javax.net.ssl.SSLSocketFactory");
            prop.setProperty("mail.pop3.socketFactory.fallback", "false");
            prop.setProperty("mail.pop3.port", "995");
            prop.setProperty("mail.pop3.socketFactory.port", "995");
            prop.put("mail.pop3.host", host);
            prop.put("mail.store.protocol", "pop3");
            Session session = Session.getDefaultInstance(prop);
            Store store = session.getStore();
            System.out.println("your ID is : "+ user);
            System.out.println("Connecting...");
            store.connect(host, user, password);
            System.out.println("Connected...");
            // Get "INBOX"
            Folder fldr = store.getFolder("INBOX");
            fldr.open(Folder.READ_ONLY);
            int count = fldr.getMessageCount();
            System.out.println(count  + " total messages");
            // Message numebers start at 1
            for(int i = 1; i <= count; i++) {
                                        // Get  a message by its sequence number
                Message m = fldr.getMessage(i);
                // Get some headers
                Date date = m.getSentDate();
                Address [] from = m.getFrom();
                String subj = m.getSubject();
                String mimeType = m.getContentType();
                System.out.println(date + "\t" + from[0] + "\t" +
                                    subj + "\t" + mimeType);
            // Search for e-mails by some subject substring
            String pattern = subjectSubstringToSearch;
            SubjectTerm st = new SubjectTerm(pattern);
            // Get some message references
            Message [] found = fldr.search(st);
            System.out.println(found.length +
                                " messages matched Subject pattern \"" +
                                pattern + "\"");
            for (int i = 0; i < found.length; i++) {
                Message m = found;
// Get some headers
Date date = m.getSentDate();
Address [] from = m.getFrom();
String subj = m.getSubject();
String mimeType = m.getContentType();
System.out.println(date + "\t" + from[0] + "\t" +
subj + "\t" + mimeType);
Object o = m.getContent();
if (o instanceof String) {
System.out.println("**This is a String Message**");
System.out.println((String)o);
else if (o instanceof Multipart) {
System.out.print("**This is a Multipart Message. ");
Multipart mp = (Multipart)o;
int count3 = mp.getCount();
System.out.println("It has " + count3 +
" BodyParts in it**");
for (int j = 0; j < count3; j++) {
// Part are numbered starting at 0
BodyPart b = mp.getBodyPart(j);
String mimeType2 = b.getContentType();
System.out.println( "BodyPart " + (j + 1) +
" is of MimeType " + mimeType);
Object o2 = b.getContent();
if (o2 instanceof String) {
System.out.println("**This is a String BodyPart**");
System.out.println((String)o2);
else if (o2 instanceof Multipart) {
System.out.print(
"**This BodyPart is a nested Multipart. ");
Multipart mp2 = (Multipart)o2;
int count2 = mp2.getCount();
System.out.println("It has " + count2 +
"further BodyParts in it**");
else if (o2 instanceof InputStream) {
System.out.println(
"**This is an InputStream BodyPart**");
} //End of for
else if (o instanceof InputStream) {
System.out.println("**This is an InputStream message**");
InputStream is = (InputStream)o;
// Assumes character content (not binary images)
int c;
while ((c = is.read()) != -1) {
System.out.write(c);
// Uncomment to set "delete" flag on the message
//m.setFlag(Flags.Flag.DELETED,true);
} //End of for
// "true" actually deletes flagged messages from folder
fldr.close(true);
store.close();
catch (MessagingException mex) {
// Prints all nested (chained) exceptions as well
mex.printStackTrace();
catch (IOException ioex) {
ioex.printStackTrace();
Please tell me.
Thanks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

Is it possible that GMail only allows access to untagged emails via POP3? Or only to emails from the last x days?
POP3 is the older email retrieval protocol (IMAP4 is the more current one) and only has very limited support for folders (or anything but a single inbox, really). It's quite common that POP3 only allows access to a subset of all emails stored by a provider.