Introduction
- JMS stands for Java Message Service. JMS is an API that provides facility to read, create and send messages. JMS is asynchronous (To receive the message, client is not required to send request. Message will arrive automatically to the client) communication.
- JMS is mainly used to send and receive message from one application to another.
- Following are the messaging domain in JMS
- Point-to-Point messaging domain: In this model, one message is delivered to one receiver only. There will be a QUEUE to hold the message until the receiver is ready.
- Publisher/Subscriber (Pub/Sub) Messaging domain: In this model, one message is delivered to all the subscribers. There will be a TOPIC to hold and deliver messages.
- Point-to-Point messaging domain: In this model, one message is delivered to one receiver only. There will be a QUEUE to hold the message until the receiver is ready.
JMS Programming Model
JMS Queue (Point-to-Point messaging domain) configuration
In Case of Point-to-Point messaging, QUEUE will hold the message until the receiver is ready to receive the message. Here, we shall be creating two JNDI in Weblogic 12c.
- Create connection factory named queuedConnFactory
- Create destination resource named, myQueue
Once JNDI is created, server and receiver application needs to be created. Server and Receiver needs to run in two different console.
Create the following in Weblogic server
| SL NO | Type | Description | Object Name | JNDI Name |
|---|---|---|---|---|
| 1 | JMS Server | JMS Server acts as a management container for resources (Queue/Topic) within JMS module. JMS module will be created inside JMS Server | myJMSServer | |
| 2 | JMS Module | JMS Module contains resources such as Queues/Topics. This module is required in order to create JMS Queue | myJMSModule | |
| 3 | Subdeployment | JMS modules are targeted to one or more WLS instances or a cluster. A subdeployment is a grouping of such targets. | mySubdeployment | |
| 4 | Connection Factory | A connection factory is a resource that enables JMS clients to create connections to JMS destinations. | myConnectionFactory | jms/myConnectionFactory |
| 5 | JMS Queue | JMS Queue is a point-to-point destination type | myJMSQueue | jms/myJMSQueue |