JMS队列消息接收顺序

Question

我正在按顺序在同一目标中添加两条 JMS 消息。这两条消息的接收顺序是否与我添加它们的顺序相同，或者是否有机会进行反向排序，即在目标中首先接收到的消息将首先被检索。

我正在添加到目的地：

producer.send(Msg1);
producer.send(Msg2);

Msg1 和Msg2 在所有情况下都会按顺序添加（如网络故障和延迟等）？

Answer 1

不保证消息顺序（规范也没有强制要求），Total JMS Message ordering 详细解释了原因。另请参阅 Stack 溢出帖子 How to handle order of messages in JMS?。

Answer 2

根据 JMS2 规范

JMS defines that messages sent by a session to a destination must be received
in the order in which they were sent. This defines a partial ordering
constraint on a session’s input message stream.

JMS does not define order of message receipt across destinations or across
a destination’s messages sent from multiple sessions. This aspect of a
session’s input message stream order is timing-dependent. It is not under    
application control.

还有

Although clients loosely view the messages they produce within a session
as forming a serial stream of sent messages, the total ordering of this stream
is not significant. The only ordering that is visible to receiving clients is
the order of messages a session sends to a particular destination.
Several things can affect this order like message priority, 
persistent/non persistent etc.

因此，为了回答您的问题，消息将按照与上述信息一起发送的相同顺序收到。然而，消息传递到服务器的顺序会受到消息优先级、持久性/非持久性等限制的约束。