Back   So far it's working fine.   I also found the problem with the writing in the file. The garbage data between the interceptor and the message can contain literally anything. It contained \n which is the LF in Linux systems. This was causing the Kafka problem as well. Kafka see the \n and it assumes that the message is 2 messages, not 1, that's why when I changed the delimiter to \r\n it assumed the message to be 1 message. That's a good conclusion I guess.   If you want to write in a file or apply a regex on it, then just replace \n and \r with an empty string so you don't bother with those annoying control characters.   Thanks to whoever wanted to help me.     ... View more