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The following table lists the packages that are commonly used by WebLogic JMS applications. WebLogic-specific JMS public API that provides additional classes and methods, as described in Value-Added Public JMS API Extensions. Before proceeding, ensure that the system administrator responsible for configuring WebLogic Server has configured the required JMS resources, including the connection factories, JMS servers, and destinations.
For more information, see "Configure Messaging" in the Oracle WebLogic Server Administration Console Online Help. Before you can look up a connection factory, it must be defined as part of the configuration information. You can create a connection for accessing the messaging system by using the ConnectionFactory methods described in the following sections. The first method creates a QueueConnection; the second method creates a QueueConnection using a specified user identity. The first method creates a TopicConnection; the second method creates a TopicConnection using a specified user identity. You can create one or more sessions for accessing a queue or topic using the Connection methods described in the following sections. A session and its message producers and consumers can only be accessed by one thread at a time. You must specify a boolean argument indicating whether the session will be transacted (true) or non-transacted (false), and an integer that indicates the acknowledge mode for non-transacted sessions. Before you can look up a destination, the destination must be configured by the WebLogic JMS system administrator, as described in "Configure topics" and "Configure queues" in the Oracle WebLogic Server Administration Console Online Help.
The createQueue() and createTopic() methods do not create destinations dynamically; they create only references to destinations that already exist. For the syntax of JNDI name, createQueue(), and createTopic(), see How to Lookup a Destination. You can create message producers and message consumers by passing the destination reference to the Session methods described in the following sections. If you pass a value of null to the createSender() method, you create an anonymous producer.
If you pass a value of null to the createPublisher() method, you create an anonymous producer. An application can have JMS connections that it uses to both publish and subscribe to the same topic.
For an example of the onMessage() method interface, see Example: Setting Up a PTP Application. If you wish to issue the close() method within an onMessage() method call, the system administrator must select the Allow Close In OnMessage option when configuring the connection factory.
Optionally, implement an exception listener on the session to catch exceptions, as described in Defining a Connection Exception Listener. You can unset a message listener by calling the MessageListener() method with a value of null. WebLogic JMS guarantees that multiple onMessage() calls for the same session will not be executed simultaneously. If a message consumer is closed by an administrator or as the result of a server failure, a ConsumerClosedException is delivered to the session exception listener, if one has been defined. Define the required variables, including the JNDI context, JMS connection factory, and queue static variables. Create a reference to a message producer (queue sender) using the session and destination (queue). In the first line, instead of calling the createSender() method to create a reference to the queue sender, the application calls the createReceiver() method to create the queue receiver.
It is good practice to verify that the received message is the type expected by the handler method.
Define the required variables, including the JNDI context, JMS connection factory, and topic static variables.
Create a reference to a message producer (topic publisher) using the session and destination (topic). In the first line, instead of calling the createPublisher() method to create a reference to the topic publisher, the application calls the createSubscriber() method to create the topic subscriber. Once you have set up the JMS application as described in Setting Up a JMS Application, you can send messages. This step has already been accomplished as part of the client setup procedure, as described in Step 6a: Create the Message Object (Message Producers). This step may have been accomplished when setting up an application, as described in Step 6a: Create the Message Object (Message Producers). If a value has not been specified or if you wish to change an existing value, you can define a value using the appropriate set method. If multiple topic subscribers are defined for the same topic, each subscriber will receive its own local copy of a message. Connection factory or destination override configuration attributes defined for the producer, as described "Configure default delivery parameters" in the Oracle WebLogic Server Administration Console Online Help. Values specified using the message producer's set methods, as described in Setting Message Producer Attributes. TimeToDeliver (that is, birth time), which represents the delay before a sent message is made visible on its target destination. RedeliveryLimit, which determines the number of times a message is redelivered after a recover or rollback. SendTimeout, which is the maximum time the producer will wait for space when sending a message. If you define the delivery mode as PERSISTENT, you should configure a backing store for the destination, as described in "Configure persistent stores" in the Oracle WebLogic Server Administration Console Online Help. If no backing store is configured, then the delivery mode is changed to NON_PERSISTENT and messages are not written to the persistent store. If the queue sender is an anonymous producer (that is, if when the queue was created, the name was set to null), then you must specify the queue name (using one of the last two methods) to indicate where to deliver messages. If you define the delivery mode as PERSISTENT, you should configure a backing store, as described in "Configure custom persistent stores" in the Oracle WebLogic Server Administration Console Online Help.


If no backing store is configured, then the delivery mode is changed to NON_PERSISTENT and no messages are stored.
If the topic publisher is an anonymous producer (that is, if when the topic was created, the name was set to null), then you must specify the topic name (using either of the last two methods) to indicate where to deliver messages. As described in the previous section, when sending a message, you can optionally specify the delivery mode, priority, and time-to-live values. Alternatively, you can set the delivery mode, priority, time-to-deliver, time-to-live, and redelivery delay (timeout), and redelivery limit values dynamically using the message producer's set methods. The delivery mode, priority, time-to-live, time-to-deliver, redelivery delay (timeout), and redelivery limit attribute settings can be overridden by the destination using the Delivery Mode Override, Priority Override, Time To Live Override, Time To Deliver Override, Redelivery Delay Override, and Redelivery Limit configuration attributes, as described in "Configure message delivery overrides" and "Configure topic message delivery overrides" in the Oracle WebLogic Server Administration Console Online Help.
JMS defines optional MessageProducer methods for disabling the message ID and timestamp information.
Once you have set up the JMS application as described in Setting Up a JMS Application, you can receive messages. To receive a message, you must create the receiver object and specify whether you want to receive messages asynchronously or synchronously, as described in the following sections. Message delivery attributes (delivery mode and sorting criteria) defined during configuration or as part of the send() method, as described in Sending Messages.
Destination sort order set using destination keys, as described in "Configure destination keys" in the Oracle WebLogic Server Administration Console Online Help. Once received, you can modify the header field values; however, the message properties and message body are read-only. You can control the maximum number of messages that may exist for an asynchronous consumer and that have not yet been passed to the message listener by setting the Messages Maximum attribute when configuring the connection factory. If messages are produced faster than asynchronous message listeners (consumers) can consume them, a JMS server will push multiple unconsumed messages in a batch to another session with available asynchronous message listeners.
You can control a client's maximum pipeline size by configuring the Messages Maximum per Session attribute on the client's connection factory, which is defined as the "maximum number of messages that can exist for an asynchronous consumer and that have not yet been passed to the message listener". Statistics — JMS monitoring statistics reports backlogged messages in a message pipeline as pending (for queues and durable subscribers) until they are either committed or acknowledged. Performance — Increasing the Messages Maximum pipeline size may improve performance for high-throughput applications. The Messages Maximum per Session pipeline size setting on the connection factory is not related to the Messages Maximum quota settings on JMS servers and destinations.
Pipelined messages are sometimes aggregated into a single message on the network transport. In releases prior to WebLogic Server 9.1, synchronous consumers required making a two-way network calls for each message, which was an inefficient model because the synchronous consumer could not retrieve multiple messages, and could also increase network traffic resources, since synchronous consumers would continually poll the server for available messages. Similar to the asynchronous message pipeline, when the Prefetch Mode is enabled on a JMS client's connection factory, the connection factory's targeted JMS servers will proactively push batches of unconsumed messages to synchronous message consumers, using the connection factory's Messages Maximum per Session parameter to define the maximum number of messages per batch. Synchronous message prefetching does not support user (XA) transactions for synchronous message receives or multiple synchronous consumers per session (regardless of queue or topic).
For more information on the behavior of pipelined messages, see Asynchronous Message Pipeline.
This section applies only to non-transacted sessions for which the acknowledge mode is set to CLIENT_ACKNOWLEDGE. Messages in queues are not necessarily redelivered in the same order that they were originally delivered, nor to the same queue consumers.
The default policy of "All" specifies that calling acknowledge on a message acknowledges all unacknowledged messages received on the session. The "Previous" policy specifies that calling acknowledge on a message acknowledges only unacknowledged messages up to, and including, the given message.
This method is effective only when issued by a non-transacted session for which the acknowledge mode is set to CLIENT_ACKNOWLEDGE. When you have finished using the connection, session, message producer or consumer, connection consumer, or queue browser created on behalf of a JMS application, you should explicitly close them to release the resources.
The call blocks until the method call completes or until any outstanding asynchronous receiver onMessage() calls complete. In the QueueSend example, the close() method is called at the end of main() to close objects and free resources. Scripting on this page enhances content navigation, but does not change the content in any way.
Much of the customer engagement research Scantron has conducted, over many years and including many different industries, indicates the lack of meeting these primary needs and promoting loyalty among customers.  In just one customer service transaction we can demonstrate the importance of service and how easily these needs, if understood and addressed, may be met.
For example, let’s consider a customer has a problem with either the service or product they purchased from an organization and is calling customer service in search of a resolution.  The moment the customer service representative answers the phone, the opportunity for the fulfillment of the emotional needs of the customers begin.
The behaviors suggested through this example are nearly effortless but are not always being conducted, thus leading to missed opportunities to meet the emotional primary needs of customers and promote the development of loyalty.  Also, these behaviors should be part of the functioning and performance of ALL representatives of an organization since every customer interaction provides the opportunity to facilitate loyalty by meeting emotional needs. The next article in this series will focus upon the importance of employees, training and retaining an engaged work force for any organization interested in increasing their loyal customer base, promoting customer engagement and growing their business.  After all, the employees are the link of the organization to the customer and represent the face and provide the experience that defines the organization and brand.
Enjoy this exclusive slideshows treat!NEW DELHI: The advanced developing countries quartet, BASIC, has put out its vision of the proposed Paris Agreement. WebLogic JMS provides two default connection factories that are included as part of the configuration.
For any application other than a servlet application, you must pass an environment used to create the initial context.
In each case, a connection is created in stopped mode and must be started in order to accept messages, as described in Step 7: Start the Connection. Once received, you can modify the header field values; however, the message properties and message body are read only.
In this case, you must specify the queue name when sending messages, as described in Sending Messages. You may also specify a message selector for filtering messages and a noLocal flag (described later in this section). In this case, you must specify the topic name when sending messages, as described in Sending Messages. Because topic messages are delivered to all subscribers, the application can receive messages it has published itself. For more information on configuring connection factory options, see "Configuring Basic JMS System Resources" in Administering JMS Resources for Oracle WebLogic Server.


The following code defines the session as non-transacted and specifies that messages will be acknowledged automatically. The method verifies that the message is a TextMessage and, if it is, prints the text of the message. The following defines the session as non-transacted and specifies that messages will be acknowledged automatically. Whether or not this step has already been accomplished depends on the method that was called to create the message object. The Destination and MessageProducer objects were created when you set up the application, as described in Setting Up a JMS Application. For more information about defining anonymous producers, see Create QueueSenders and QueueReceivers. For more information about defining anonymous producers, see Create TopicPublishers and TopicSubscribers.
If not specified, these attributes are set to the connection factory configuration attributes, as described in "Configure connection factories" in the Oracle WebLogic Server Administration Console Online Help. The following table lists the message producer set and get methods for each dynamically configurable attribute. The example shows the code required to create a TextMessage, set the text of the message, and send the message to a queue. It shows the code required to create a TextMessage, set the text of the message, and send the message to a topic. You can modify the message body by executing the corresponding message type's clearbody() method to clear the existing contents and enable write permission. These in-flight messages are sometimes referred to as the message pipeline, or in some JMS vendors as the message backlog. Note that a larger pipeline will increase client memory usage, as the pending pipelined messages accumulate on the client JVM before the asynchronous consumer's listener is called. For example, if a destination is configured to sort by priority, high priority messages will not jump ahead of low priority messages that have already been pushed into an asynchronous consumer's pipeline. If the messages are sufficiently large, the aggregate size of the data written may exceed the maximum value for the transport, which may cause undesirable behavior. If you call the receive() method with no arguments, the call blocks indefinitely until a message is produced or the application is closed. This may improve performance because messages are ready and waiting for synchronous consumers when the consumers are ready to process more messages, and it may also reduce network traffic by reducing synchronous calls from consumers that must otherwise continually poll for messages.
In most such cases, WebLogic JMS will silently and safely ignore the Prefetch Mode for Synchronous Consumer flag; however, otherwise WebLogic will fail the application's synchronous receive calls. For more information on configuring a JMS connection factory, see "Configure connection factories" in the Oracle WebLogic Server Administration Console Online Help.
Synchronously received AUTO_ACKNOWLEDGE messages may not be recovered; they have already been acknowledged.
For information to guarantee the correct ordering of redelivered messages, see Ordered Redelivery of Messages.
For example, when closing a session, all associated message producers and consumers are also closed. In addition, for more information about the connection or Session close() method, see Starting, Stopping, and Closing a Connection or Closing a Session, respectively.
This example shows the code required to close the message consumer, session, and connection objects. Meeting in New York, on the sidelines of the UN climate day, the quartet of advance developing countries has suggested focusing on more than reducing carbon pollution, and take on board each of the six issues that countries identified in Durban as central to a global climate deal. In this case, messages are acknowledged when the transaction is committed using the commit() method. For information about the methods used to create durable subscriptions enabling messages to be retained until all messages are delivered to a durable subscriber, see Creating Subscribers for a Durable Subscription.
For information about defining a session exception listener, see Defining a Connection Exception Listener. If onMessage() receives a different message type, it uses the message's toString() method to display the message contents.
For example, for TextMessage and ObjectMessage types, when you create a message object, you have the option of defining the message when you create the message object. The pipeline or backlog size is the number of messages that have accumulated on an asynchronous consumer, but which have not been passed to a message listener.
The administrator can configure new connection factories during configuration; however, these factories must be uniquely named or the server will not boot.
In this case, durable subscribers only receive messages that are published after the subscriber has subscribed. For information on configuring connection factories and the defaults that are available, see "Configure connection factories" in the Oracle WebLogic Server Administration Console Online Help. The receiveNoWait() method receives the next message if one is available, or returns null; in this case, the call does not block.
In order to speed up the process, at the end of the June round of negotiations in Bonn, all countries gave the two co-chairs of the negotiations for the post-2020 agreement, or Adhoc Working Group on the Durban Platform (ADP) as it is known UN climate parlance, the task of producing a streamlined and concise document. Industrialised countries have sought to focus on efforts made by businesses, cities, and subnational governments as against meeting the commitments made as part of the UN-sponsored climate negotiations. Developing countries particularly the BASIC have been pushing for equal focus on the pre-2020 efforts in the negotiations. The omission is surprising since South Africa has been heading a ministerial on loss and damage at the UN sponsored talks since Doha meet in 2012, and India has been a vocal supporter.
The issue of loss and damage is of central concern to the more vulnerable members of the developing country bloc G-77 and China, such as the small island states and least developed countries. Silence on this front by the advanced developing countries could undermine the developing country co-ordination and unity evident in Bonn recently. It has suggested taking an element wise approach to differentiation and taking into account the distinct development stages of developed and developing countries.



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