When message bundling is enabled, we queue regular messages until max_bundle_size has been reached or max_bundle_timeout has exceeded.

The problem is that - when sending OOB (as opposed to regular) messages - they're not queued. This means the OOB message is possibly received before the regular messages and thus causes retransmission !

E.g. we send regular message 1-10, then OOB message 11.

Say 1-3 are sent immediately (because the bundle timeout kicked in or the size was exceeded). Messages 4-10 are queued and sent later. Message 11 is sent immediately.

On the receiver side, message reception could be for example: 1-3, 11, 4-10

When OOB message 11 is received, the receiver asks for retransmission of messages 4-10 !

This is not incorrect, but causes a lot of unneeded retransmissions !

public static void main(String[] args) throws Exception {
JChannel c1=new JChannel("/home/bela/fast.xml");
c1.connect("bla3");

JChannel c2=new JChannel("/home/bela/fast.xml");
c2.connect("bla3");

for(int i=1; i <= 20; i++)

{ c1.send(null, null, "hello-" + i); }

Message oob_msg=new Message(null, null, "oob msg");
oob_msg.setFlag(Message.OOB);
c1.send(oob_msg);

Util.sleep(20000);
Util.close(c2, c1);

}