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Weblogic JMS (Java Message Service)

At the end of this chapter you will be able to:

  • Understand how WebLogic Server JMS is implemented
  • Configure JMS administered objects using the administration console
  • Configure persistent messages
  • Use the WLS administration console to monitor JMS


Message-Oriented Middleware

  • Message-oriented middleware refers to an infrastructure that supports messaging.
  • Typical message-oriented middleware architectures define these elements:
    • Message structure
    • The way to send and receive messages
    • Scaling guidelines


Point-to-Point (PTP) Queue

  • Many producers can serialize messages to multiple receivers in a queue.



Publish-Subscribe Topics

  • Publishing and subscribing to a topic decouples producers from consumers.



WebLogic Server JMS Features

  • WebLogic Server JMS supports:
    • PTP and Pub/sub domains
    • Guaranteed and transactional message delivery
    • Durable subscribers
    • Distributed destinations
    • Recovery from failed servers


JMS Architecture: Connecting



JMS Architecture: Sending Messages



Transacted Messaging

  • A JMS client can use JTA to participate in a distributed transaction.
  • Alternatively, a JMS client can demarcate transactions local to the JMS Session, through a transacted session.
  • Participation in a transaction is optional.


Administrative Tasks50

  • Administrative tasks include these:
    • Creating and monitoring JMS Servers
    • Creating connection factories
    • Creating and monitoring destinations
    • Creating JMS stores
    • Configuring thresholds and quotas
    • Configuring durable subscriptions
    • Managing JMS service fail-over


WLS JMS Server

  • In WLS, the messaging service is implemented through a JMS Server.
  • A JMS Server receives and distributes messages.



Create a JMS Server




Target a JMS Server



Configure a JMS Server



JMS Resources

  • JMS resources are managed as system modules, application modules, or packaged JDBC resource modules.



Modular JMS Resource Configuration and Deployment…

  • JMS configurations in WebLogic Server are stored as modules
    • Defined by an XML file that conforms to the weblogic-jmsmd.xsd schema
    • Similar to standard J2EE modules
  • An administrator can create and manage JMS modules as:
    • Global system resources
    • Global standalone modules
    • Modules packaged with an enterprise application
  • An advantage of modular deployment is simplified migration between environments, such as:
    • From development to integration
    • From system test to production
  • You can migrate your application and the required JMS configuration:
    • Without opening an EAR file
    • Without extensive manual JMS reconfiguration


Connection Factory

  • A connection factory:
    • Encapsulates connection configuration information
    • Is used to create pre-configured connections
    • Is stored in JNDI
    • Can be targeted to servers or clusters
  • WLS provides a default connection factory that is bound in JNDI to weblogic.jms.ConnectionFactory.
  • When a new configuration is required, a new connection factory can be created.







Configure Connection Factory: Default Delivery




Configure Connection Factory: Client



Configure Connection Factory: Transactions



Configure Connection Factory:  Flow Control




  • A destination is a lightweight object stored in JNDI.
  • It is the target on a JMS Server for sending or receiving messages.
  • The JMS destination types are:
    • Queue
    • Topic

Create a Queue Destination…





Threshold and Quota

  • A threshold and a quota can be set for Server and Destination objects.
  • A quota is a limit defined for JMS administered objects; it includes these values:
    • The maximum number of bytes that can be stored
    • The maximum number of messages that can be stored
  • A threshold is a limit that triggers message paging, flow control, and logged warnings, using:
    • Upper and lower values for the number of bytes
    • Upper and lower values for the number of messages


Configuring Thresholds and Quotas


Configuring Persistent Messaging


Durable Subscribers and Subscriptions

  • Durable subscribers register durable subscriptions to guarantee message delivery even if subscribers are inactive.
  • A subscriber is considered active if the Java object that represents it exists.
  • By default, subscribers are non-durable.
  • Administrators configure:
    • Where messages are persisted
    • Persistent connection factories and destinations


When to Use Persistent Messaging

  • Persistent messaging permits messages in memory to be written out to a persistent store.
  • Configure persistent messaging if:
    • Development requires durable subscriptions (use durable subscribers in the application)
    • You require that in-progress messages persist across server restarts


How a Durable Subscription Works

  • If a subscriber client is active, messages are delivered normally:
  • When the client becomes active again, its ID is used to retrieve and redeliver messages.




Configure a Durable Subscription

  • To configure durable subscriptions, an administrator must:
    • Create and configure a JMS store
    • Configure connection factories or destinations as persistent
    • Associate the JMS store with the JMS Server
  • The JMS store can be configured to use either:
    • A file store
    • A JDBC store (a connection pool)


Create a JMS File Store…





Create a JMS JDBC Store…

  • To configure JMS JDBC persistence:
    • Create a JDBC DataSource.
    • Create a JMS store and refer to the JDBC DataSource.
    • Refer to the JMS store from the JMS Server configuration.
  • The required infrastructure (tables, and so on) is created automatically.




Assign a Store to a JMS Server



Persistent Connection Factory





Monitoring JMS in WLS

Statistics for JMS Objects

  • Statistics are provided for the following JMS objects:
    • JMS servers
    • Connections
    • Destinations


Monitor JMS Servers…




Monitor Destinations




In this chapter, we learned how to:

  • Understand messaging concepts
  • Understand WebLogic Server’s JMS support
  • Configure JMS servers, queues, and topics
  • Monitor JMS servers, queues, and topics

Check out our Related Courses

Weblogic Tutorials

Introduction to Clustering Weblogic

WebLogic Server Admin Training in Bangalore

Oracle Weblogic Server Installation




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