Java Message Service - JMS Fundamentals

Learn how messaging exchanges business data between sender and receiver via a messaging server, enabling fault tolerance, scalability, and transaction management, as shown by a bank check processing example.

JMS supports two messaging models: point-to-point with queues, where a single receiver consumes the message, and publish-subscribe with topics, where the same message reaches multiple subscribers.

download the JMS assignment solution pdf in the resources section for reference, and refer to these completed solutions as you work on all assignments on your own.

install spring tool suite as the ide for spring based projects by downloading the version, installing, and configuring a jdk in sts preferences by pointing to a jdk folder.

Set up a maven project for JMS fundamentals, add the Artemus planed dependency, and configure the initial context factory, the connection factory, and the queues and topics.

Configure JNDI properties on the classpath to initialize JMS with ActiveMQ, defining the initial context factory, connection factory, and a queue mapped to a broker object.

Send and receive text messages with JMS by creating an initial context, retrieving a connection factory, building a session, and using a producer and consumer with a queue.

Set up a Maven JMS project, add Artemis JMS client, configure jndi and broker queue, look up the queue, create a connection and session, then send and consume text message.

Use consumer.receive to obtain the actual message and read its JMS priority header. Understand the default priority is four, and without set priorities, messages are delivered in order received.

Implement request-reply messaging with JMS by sending from application one to application two, who replies on a dedicated reply queue using message IDs and correlation IDs.

Learn to use the replyTo header in JMS to dynamically specify the reply destination, set the jms reply to on the message, and route replies via the designated queue.

Link requests to replies using JMS message ID and correlation ID headers. Producers generate a JMS ID and replies use the correlation ID to route each response correctly.

Set a message expiry with set time to live in a JMS producer, observe the message expiring after 2 seconds, and moving to the expiry queue.

Learn how to create and send a Java object message in JMS by serializing a patient object, ensuring it implements serializable, and deserializing it on the consumer side.

Use point to point for one-to-one communication between decoupled applications, with read-once messages, and leverage interoperability, throughput, and a queue browser.

Learn point-to-point messaging with a patient eligibility use case, implementing decoupled clinical and eligibility apps that exchange insurance data via queues, enabling asynchronous processing and load balancing across multiple consumers.

Create a patient model class for the hospital management JMS project, featuring id, name, insurance provider, copay, and amount to be paid. Implement serializable for queue transmission.

Learn asynchronous processing in JMS by implementing a message listener with an on message method, registering it with the JMS provider, and eliminating polling overhead.

Learn to receive patient data using JMS by creating a consumer, setting a message listener, and handling ObjectMessage to cast to a patient object for asynchronous processing.

Test the clinical and eligibility checker apps with a JMS-based workflow, using a listener and main method to observe true or false eligibility based on copay and decoupled messaging.

Demonstrates load balancing with JMS by sending ten messages to a queue and using multiple consumers to process them in parallel, showcasing scalable, concurrent consumption.

Explore the publish-subscribe messaging model in JMS, where a publisher writes to a topic and multiple subscribers react to events across applications such as bed management and billing.

Create a hr app that publishes an employee object to a JMS topic, defining an employee class that implements Serializable and sending the serialized message via a JMS producer.

Demonstrates a publish-subscribe workflow in JMS by running payroll, security, and wellness subscribers that listen to a topic, while the HR publisher sends a message received by all subscribers.

Learn how JMS filters use selectors with SQL-like syntax to filter messages by properties and headers. The filters apply to the message metadata, not the payload.

create a maven project named message filtering and set up a claim queue. build a serializable claim model with hospital id, doctor name, doctor type, insurance provider, and claim amount.

Set up a Maven project in STS for guaranteed messaging, add pom.xml dependencies, and configure JNDI properties. Create a request queue to demonstrate JMS acknowledgement modes and transaction management.

Explore CLIENT_ACKNOWLEDGE and DUPS_OK_ACKNOWLEDGE modes in JMS, showing how the client takes control with explicit message.acknowledge on the consumer to remove messages from the queue.

Enable transactions in JMS by using session transacted on producers and consumers, committing or rolling back to manage message delivery and discard or re-deliver uncommitted messages.

Enable transactions on the JMS context and session to ensure commits finalize delivery, with rollback available to undo pending messages in producer and consumer workflows.

Enable transactions on the consumer side with JMS context to commit and remove messages from the queue after processing. Use rollback to undo processing when needed.

Create two users: clinical user and eligibility user, and two roles in the P2P JMS app, set their user-password pairs, and assign each user to its role to secure the broker.