Thanks Praveen,
I tested the java map again today, and found it was working fine now...
But there seems to be a small issue still, when I was refreshing the folder(al11) where the splited file would be written, the first 2 files were empty(with 0 bytes as length), and after 1 second refreshing again, they became filled... so I set "Msecs to Wait before modificationc check" to 6s with the sender channel which will pick these files, it is working properly as far as now.