Hi, A customer is reporting slow Ftp upload in Java 7, versus Java 6. << In our application, we are using URL.openConnection() to open the FTP connection. We would like to know if there is a way to open the buffer Size as mentioned in the URL below or could we do something else to make the ��� java FTP��� file transfer faster ? http://stackoverflow.com/questions/14000341/why-is-ftp-upload-slow-in-java-7" >> The last version tested that does not worked is 7u15. The version that is working is 6u33. Solaris 10 No testcase, but here is the snippet: URL lUrl = new URL(aInContextURL, aInFtpUrl); lUrl.openConnection().getOutputStream(); wireshark snippet when using jdk_1.7.0_15 - BAD case 1205826 728.057224 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 220 bytes 1205827 728.059320 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 1205828 728.059327 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 1 bytes 1205829 728.059331 135.121.1.60 135.121.1.171 TCP 51748 > 48997 [ACK] Seq=1 Ack=527417331 Win=49640 Len=0 1205830 728.059403 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 14 bytes 1205831 728.061662 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 1205832 728.061668 135.121.1.171 135.121.1.60 FTP-DATA FTP Data: 1 bytes 1,205,871 packets to send 503M file using ftp wireshark snippet when using jdk_1.6.0_33 - GOOD case 50 0.197849 135.121.1.60 135.121.1.23 TCP 25616 > 53511 [ACK] Seq=1 Ack=10221 Win=49640 Len=0 51 0.197965 135.121.1.23 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 52 0.198089 135.121.1.23 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 53 0.198211 135.121.1.23 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 54 0.198334 135.121.1.23 135.121.1.60 FTP-DATA FTP Data: 1460 bytes 397,919 packets to send 462M file using ftp Seeking advice, pointers, further debugging tips. Thank you, Kim
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