Qpid Broker for Java supports a number of custom arguments which can be specified as part of queue.declare commands for AMQP 0-x protocols. This section provides an overview of the supported arguments. Argument Name Description Declaration of overflow policy. See for more details. qpid.policy_type Defines queue overflow policy. qpid.max_count Defines maximum number of messages. qpid.max_size Defines maximum number of bytes. The Overflow Policy and the limits can be specified using Address based syntax as in the example below: Alternative declaration of Producer Flow Control overflow policy. See for more details. x-qpid-capacity Defines maximum number of bytes. x-qpid-flow-resume-capacity Defines flow resume threshold in bytes The Producer Flow Control can be specified using Address based syntax as in the example below: