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You should contact the authors of the software about that.

You need to add a call to the printStackTrace() method in the catch block to get the full text of the error message.

I'd go with the breaking the huge file into parts, sending the parts and then putting them back together, instead of trying to send Gigabytes.

Otherwise contact the authors of the code you are...

Define a custom protocol for sending the blocks. Add a header that has a block number and size before the bytes being sent.

My suggestion has nothing to do with the contents of the file. It is strictly byte by byte.
Copy the first n bytes to a file
copy the next n bytes to another file
etc

Then read the short files...

You could write a utility program to split the large file into smaller chunks to be sent and then to join the chunks back together into the single file.

(I have a project like that in mind for...