What is the most commonly used Java message queuing middleware now?

ActiveMQ is the most popular and powerful open source message bus produced by Apache. ActiveMQ is a JMS provider implementation, which fully supports JMS 1. 1 and J2EE 1.4 specifications. Although the JMS specification has been published for a long time, JMS still plays a special role in today's J2EE applications.

MetaQ is a complete queue model message middleware. The server is written in Java language and can be deployed on various software and hardware platforms. The client supports Java and C++ programming languages. A server can support more than 10000 message queues. By expanding the server, the number of queues can be expanded at almost any level. Each queue is persistent, unlimited in length (depending on the size of disk space) and can be used from anywhere in the queue.