I have transferred file using ftp client. there is difference in size.
machine 1.
-rw-r--r-- 1 root root 13059879 Aug 13 08:39 file.tar.gz


import org.apache.commons.net.ftp.FTPClient;
FTPClient client = new FTPClient();
FileInputStream fis = null;
try {

client.connect(ip);
client.login("userd","pwd");
client.setFileTransferMode(FTPClient.COMPRESSED_TRANSFER_MODE);
String workingdir=Property.getThemeWorkingDir().trim();
String themefilename=Property.getThemeFileName().trim();
client.changeWorkingDirectory(workingdir);
String filename = workingdir+themefilename;
File f=new File(filename);
fis = new FileInputStream(f);
client.storeFile(themefilename,fis);

} catch (IOException e) {
log.error(e.getStackTrace());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
l
} finally {
try {
if (fis != null) {
fis.close();
}
client.logout();
client.disconnect();
} catch (IOException e) {

}
}

machine 2:
-rw-r--r-- 1 root root 3948485 Aug 13 08:39 file.tar.gz

tar -zxvf file.tar.gz

error:
tar: Skipping to next header
tar: Archive contains obsolescent base-64 headers

gzip: stdin: invalid compressed data--format violated
tar: Child returned status 1
tar: Error exit delayed from previous errors


Please help me in finding solution

If you'd like us to help, you have to provide details, and ask a clear question. You say you used "FTP Client"...but don't tell us which one. You don't say what FTP server software you're using, on what version/distro of Linux, either. And over what kind of network link? Without details, there's nothing we can tell you.
And what is all this, and what does it have to do with this?
...and this makes sense, since the file transfer obviously got corrupted...unless you have a valid file, it won't uncompress.

using commons-net-1.0.0.jar
Linux version: 2.6.18.3 for both machine. These are connected vie LAN.

Please let me know if you need more details...

You've not provided ANY of the details asked for, so yes, you need to still provide details.

• You told us the KERNEL version...how about the version/distro (like CentOS 6.3, or Ubuntu 10.04??)
• What FTP server software are you using?
• What FTP Client are you using?
• 'Connected via LAN' tells us nothing: are they on the same subnet? Different? Firewall(s) in place on either? ANYTHING? Can you ping/SSH between the two boxes?

You give a .jar file name above, but don't tell us where you got it, or how its being used exactly. You also don't tell us (assuming this is a web-based FTP), what information (if any), you see in the Apache log files/error log files/FTP logs on either side.

Do an experiment: go to a command-line on the Linux system that's sending the file, and type in "ftp <ip address of OTHER Linux server>". Log in, change your sending mode to binary by typing in "binary" at the prompt, then "put /path/to/filename.tar.gz", and see if it works. If so, then you've ruled out the network, firewalls, and FTP server, and the error(s) are on your web page.