Questions about incomingQueue and blocking

[imaginator]

The following question came up:

in ChannelEngine the method processPacket() is adding incoming packet to incomingQueue. But the queue is implemented as BlockingQueue and for adding is put() used. The put works as it blocks if the queue is full. But there are other methods like add() that adds in not blocking manner and throws exception if the queue is full. In second case war could send error stanza back.

Can someone more "skilled in the art" comment on this?