I know its been a long time since you published this entry, and a while since your last post. However I am hoping you can help me out a little if you get this. I am using this nifty little applet to bypass by hosts upload limit.

It seems at a certain point in the middle of uploading a file the thread quits with a java.lang.NullPointerException
on ftpOut.write(buffer, 0, bytesRead);

I cant for the life of me understand why it would happen. I get 8 KB’s into the upload then bang, right on 8 i get this exception everything time.

With your problem, ensure your uploadedFileName parameter is an absolute path to the file you want the data to be saved to and that you accepted the security certificate.

There could be a few things causing this issue (unfortunately), including firewall stuff. You may be able to check the applet console for more information on what is going on.

To do this load up the applet without attempting to upload the file. Then right click on the java icon in your taskbar and click “Open Console”. Then try uploading the file and see what messages appear in the console.

Feel free to hit me back here with any error messages that popup and I’ll try and work through them with you.

I’m attempting to create a modified version of this script for uploading large files to my site ( > 100Mb), as its just the sort of simple use of java ftp I’m after. I tested locally with a short connect (to a remote ftp) and create directory routine, recompiling everything using your compilation script once I’d finished.

While everything loads correctly, and my connection and directory creation elements seem to work fine, the script fails when actually attempting to transfer the file. The status bar just reads 8Kb and sits at 0%.

Any ideas?