Java Messaging Service - Spring MVC, Spring Boot, ActiveMQ

Explore how Java Messaging Service enables two Java applications to interact via a message queue using ActiveMQ, with Spring MVC integration for publishers and consumers.

Publish a message to a queue where only one of many attached consumers processes it, enabling background tasks like emailing customers and updating shipments in Spring MVC with ActiveMQ.

Understand what a queue is in messaging through a WhatsApp analogy, where publishers send to a queue and consumers receive messages in round robin, via ActiveMQ.

Install Apache ActiveMQ, download the stable release, extract it, and start ActiveMQ on localhost port 8161. Create a queue demo and log in with admin admin to see pending messages.

Add authentication and authorization to Apache ActiveMQ by configuring simple authentication and authorization plugins in activemq.xml, securing broker access for queues and topics for the admins group.

Publish your first message to an ActiveMQ queue from a Java application by configuring a connection factory, session, and producer to send a 'first message' to the demo queue.

Explore client acknowledgement mode in Java messaging, showing manual acknowledgement, message redelivery until acknowledgement, and when to use client versus auto mode in a consumer.

Showcases a real-time pattern with ActiveMQ by publishing a JSON message from a REST API to a queue, enabling a consumer to generate an Excel file and email it.

Create a topic in Apache ActiveMQ and explore the publish-subscribe model, starting with a subscriber and a publisher to see how messages flow.

Publish messages to a topic using a JMS publisher with ActiveMQ, demonstrating topic creation, text messages, and durable subscribers to observe offline delivery behavior.

Set up Spring application with ActiveMQ by adding Spring ActiveMQ and Spring Template, configure publisher and consumer under com.demo, and send a json message to queue when viewing a product.

Configure a JMS publisher with Spring template by creating a GM's config class, enabling JMS, and wiring an ActiveMQ connection factory and JmsTemplate to publish messages to the queue.

Build a JMS consumer with the Spring JMS template, attach it to the demo queue on ActiveMQ, receive json messages, and print product name after mapping to a product object.

Set up a Spring Boot application by adding ActiveMQ dependencies in pom.xml and configuring the broker URL and credentials in application.properties. Spring Boot handles boilerplate for both publisher and consumer.

Explore how to use Java messaging service and integrate it with Spring MVC and Spring Boot through the Spring template, and stay tuned for additional lectures coming soon.