Outgoing File Transfer problems

i’‘m having a weird run-time error that I don’'t even know how to approach.

Snippet of my code:

BufferedImage image = ImageIO.read(new ByteArrayInputStream (screens[0]));

File screenshot = new File(“snapshot.png”);


ImageIO.write(image, “png”, screenshot);

FileTransferManager transferManager = new FileTransferManager(jabber);

                                    OutgoingFileTransfer transferFile = transferManager.createOutgoingFileTransfer("hsholter@jabber.cssb.mb.ca/vpn2");



System.out.println(“attempting to send file”);

transferFile.sendFile(screenshot, “desktop screenshot”);

System.out.println(“File transfer has started”);



System.out.println(“not done”);

if (transferFile.getStatus().equals(FileTransfer.Status.REFUSED))


System.out.println(“file transfer was refused!”);







catch (InterruptedException e)






Hey Heather,

What behavior are you experiencing that is a runtime error? Also, did you know that you can send the stream direct to the other user without needing to send it by writing a file to the file system?



Yeah, I know I can send it as a stream. I want to create it as a file so i have a copy of the image on our server machine.

When I press reject the file transfer - nothing bad happens.

When I press accept on the file transfer - i get that exception spitting out that I posted above.


Could you post the complete exception you are seeing?



oh weird, i thought I had that in my original post, now I see that it isn’'t lol.

attempting to send file

File transfer has started

Exception in thread “File Transfer jsi_1870735163590703614” java.lang.ClassCastException: org.jivesoftware.smack.PacketReader$4

at org.jivesoftware.smackx.filetransfer.FileTransferNegotiator.negotiateOutgoingTr ansfer(FileTransferNegotiator.java:381)

at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.negotiateStream(Outgo ingFileTransfer.java:289)

at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.access$200(OutgoingFi leTransfer.java:35)

at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer$2.run(OutgoingFileTra nsfer.java:207)

at java.lang.Thread.run(Thread.java:595)

That error looks vaguely familiar from another issue I was having… Try running with -Dsmack.debugEnabled=true.

When the debugger pops up check the smack info tab, and see what IQ Providers and Extension Providers you have loaded. I found the issue was with my classpath, I think it as a smack-config.xml file that wasn’'t on it, or something like that.