The following system properties affect the behaviour of the Client. System properties are global in nature so affect all Qpid interactions made from within the same JVM. For many options, there are equivalent Connection URL options allowing the option to be controlled at the level of the Connection. Property Name Type Default Value Description qpid.amqp.version string 0-10 Sets the AMQP version to be used - currently supports one of {0-8,0-9,0-91,0-10}.The client will begin negotiation at the specified version and only negotiate downwards if the Broker does not support the specified version. qpid.heartbeat int Defaults to the heartbeat value suggested by the Broker, if any. Frequency of heartbeat messages (in seconds). A value of 0 disables heartbeating. Two consecutive missed heartbeats will result in the connection timing out.This can also be set per connection using the Connection URL options.For compatibility with old client configuration, the synonym amqj.heartbeat.delay is supported. ignore_setclientID boolean false If a client ID is specified in the connection URL it's used or else an ID is generated. If an ID is specified after it's been set Qpid will throw an exception. Setting this property to 'true' will disable that check and allow you to set a client ID of your choice later on. qpid.connection_ssl_verify_hostname boolean true This property is used to turn on/off broker host name verification on SSL negotiation if SSL transport is used. It is set to 'true' by default. Setting this property to 'false' will disable that check and allow you to ignore host name errors. qpid.connection_compress_messages Boolean false Controls whether the client will compress messages before they they are sent. qpid.message_compression_threshold_size Integer 102400 The payload size beyond which the client will start to compress message payloads. Property Name Type Default Value Description qpid.dest_syntax String ADDR Addressing syntax: ADDR (Address format) or BURL (Binding URL) max_prefetch int 500 Maximum number of pre-fetched messages per Session. This can also be defaulted for sessions created on a particular connection using the Connection URL options. qpid.use_legacy_map_message boolean false If set will use the old map message encoding. By default the Map messages are encoded using the 0-10 map encoding.This can also be set per connection using the Connection URL options. qpid.jms.daemon.dispatcher boolean false Controls whether the Session dispatcher thread is a daemon thread or not. If this system property is set to true then the Session dispatcher threads will be created as daemon threads. This setting is introduced in version 0.16. Property Name Type Default Value Description qpid.declare_exchanges Boolean true If true, creating a consumer will also declare the exchange on the Broker (specified within the Binding URL associated with the Destination), creating it if is does not already exist. qpid.declare_queues Boolean true If true, creating a consumer will also declare the queue on the Broker (specified within the Binding URL associated with the Destination), creating it if is does not already exist. qpid.bind_queues Boolean true If true, creating a consumer will also bind the queue to the to the exchange using the routing key as a binding key. The exchange name, queue name and routing key are taken from the Binding URL associated with the Destination. qpid.reject.behaviour String NORMAL Used with the maximum delivery count feature. See for details. sync_client_ack boolean true If set true, for sessions using Session#CLIENT_ACKNOWLEDGE, a sync command is sent after every message Message#acknowledge(). This ensure that the client awaits the successful processing of the acknowledgement by server before continuing. If false, the sync is not performed. This will improve performance but will mean duplicate messages are more likely to be received following a failure. This can also be set per connection using the Connection URL options. Property Name Type Default Value Description qpid.default_mandatory Boolean True If true, messages sent to Queue destinations for which cannot be routed to at least one queue on the Broker, will be returned to the application. See for more details. qpid.default_mandatory_topic Boolean False If true, messages sent to Topic destinations for which cannot be routed to at least one queue on the Broker, will be returned to the application. See for more details.. qpid.default_immediate Boolean False If true, the message will be returned to the application unless the Broker is able to route the message to at least one queue with a consumer attached. See for more details. qpid.flow_control_wait_failure Long 60000 Used with . The amount of time (in milliseconds) to wait before timing out. qpid.flow_control_wait_notify_period Long 5000 Used with . The frequency at which the log message informing that the producer is flow controlled . sync_publish string "" (disabled) If 'all' is set then messages will be sent synchronously. This can also be set per connection using the Connection URL options. Property Name Type Default Value Description qpid.thread_factory string org.apache.qpid.thread.DefaultThreadFactory Specifies the thread factory to use.If using a real time JVM, you need to set the above property to org.apache.qpid.thread.RealtimeThreadFactory. qpid.rt_thread_priority int 20 Specifies the priority (1-99) for Real time threads created by the real time thread factory. Property Name Type Default Value Description qpid.sync_op_timeout long 60000 The length of time (in milliseconds) to wait for a synchronous operation to complete.For compatibility with older clients, the synonym amqj.default_syncwrite_timeout is supported. qpid.tcp_nodelay boolean true Sets the TCP_NODELAY property of the underlying socket. The default was changed to true as of Qpid 0.14. This can also be set per connection using the Connection URL broker optiontcp_nodelay. options. For compatibility with older clients, the synonym amqj.tcp_nodelay is supported. qpid.send_buffer_size integer 65535 Sets the SO_SNDBUF property of the underlying socket. Added in Qpid 0.16. For compatibility with older clients, the synonym amqj.sendBufferSize is supported. qpid.receive_buffer_size integer 65535 Sets the SO_RCVBUF property of the underlying socket. Added in Qpid 0.16. For compatibility with older clients, the synonym amqj.receiveBufferSize is supported. qpid.failover_method_timeout long 60000 During failover, this is the timeout for each attempt to try to re-establish the connection. If a reconnection attempt exceeds the timeout, the entire failover process is aborted. It is only applicable for AMQP 0-8/0-9/0-9-1 clients. Property Name Type Default Value Description qpid.ssl_timeout long 60000 Timeout value used by the Java SSL engine when waiting on operations. qpid.ssl.KeyManagerFactory.algorithm string - The key manager factory algorithm name. If not set, defaults to the value returned from the Java runtime call KeyManagerFactory.getDefaultAlgorithm() For compatibility with older clients, the synonym qpid.ssl.keyStoreCertType is supported. qpid.ssl.TrustManagerFactory.algorithm string - The trust manager factory algorithm name. If not set, defaults to the value returned from the Java runtime call TrustManagerFactory.getDefaultAlgorithm() For compatibility with older clients, the synonym qpid.ssl.trustStoreCertType is supported. Property Name Type Default Value Description javax.net.ssl.keyStore string jvm default Specifies the key store path.This can also be set per connection using the Connection URL options. javax.net.ssl.keyStorePassword string jvm default Specifies the key store password.This can also be set per connection using the Connection URL options. javax.net.ssl.trustStore string jvm default Specifies the trust store path.This can also be set per connection using the Connection URL options. javax.net.ssl.trustStorePassword string jvm default Specifies the trust store password.This can also be set per connection using the Connection URL options.