What are queues and topics in WebLogic JMS?

A JMS server defines a set of destinations (queues or topics) and any associated persistent storage that reside on a WebLogic Server instance. A JMS server manages connections and handles all message requests for its destinations on behalf of clients. Client applications.

How do I monitor JMS queue in WebLogic?

To Monitor Topics and Queues

1. In the Explorer panel of Enterprise Manager, select the WebLogic JMS node.
2. In the Details panel, click the Topics tab.
3. Click the Queues tab.
4. When you select a topic or queue, the Messages tab in the lower portion of the Details panel displays information about the topic or queue.

How does JMS queue work?

Each message is send to a specific queue, and receiving systems consume messages from the queues established to hold their messages. Queues retain all messages sent to them until the messages are consumed by the receiver or expire. Also receiver acknowledges the consumption on each message.

What is Consumer count in JMS queue?

consumer-count The number of consumers consuming messages from this queue.

What is difference between topic and queue in JMS?

Java Message Service (JMS) is a Java message-oriented middleware API for sending messages. The main difference between queue and topic is that queue is the message-oriented middleware used in point to point message domain while the topic is the message-oriented middleware used in publisher-subscriber message domain.

What is queue connection factory in JMS?

A queue connection factory is used to create connections to the associated JMS provider of the JMS queue destinations, for point-to-point messaging. When an application needs a JMS queue connection, an instance can be created by the factory for the JMS provider that is named in the Provider column of the list.

How do I monitor JMS queues?

In the Administration Console, expand Services > Messaging > JMS Modules. In the JMS Modules table, click the JMS module that contains the configured queue that you want to access. In the selected JMS module’s Summary of Resources table, click the queue that you want to monitor. Click the Monitoring > Statistics tab.

What happens when JMS queue is full?

When the queue fills, nothing can put new messages to it. In WebSphere MQ the producing application then receives a return code indicating that the queue is full. If the application distinguishes between fatal and transient errors, it can stop and retry.

What is Consumer count?

The consumer count is the amount of consumers instantiated in your Java code. So each consumer can receive messages from the connected queue. So it is possible to have a client which simultaneously sends and receives messages, but this is purely based on your implementation.

What’s the difference between queue and topic?

A queue means a message goes to one and only one possible subscriber. A topic goes to each and every subscriber.

How does WebLogic JMS decide which message to send?

If multiple queue receivers are listening for messages on a queue, then WebLogic JMS determines which one will receive the next message on a first come, first serve basis. If no queue receivers are listening on the queue, then messages remain in the queue until a queue receiver attaches to the queue.

How does queuereceiver work in JMS?

A QueueReceiver (consumer) receives messages from the Queue. A Queue can have multiple QueueSenders and QueueReceivers, but an individual message can only be delivered to one QueueReceiver. If multiple QueueReceivers are listening for messages on a Queue, WebLogic JMS determines which will receive the next message.

What information is displayed on the JMS message management page?

By default, the JMS Message Management page displays the information about each message on a queue or durable subscriber in a table with the following columns. ID – A unique identifier for the message. Type – The JMS message type, such as BytesMessage, TextMessage, StreamMessage, ObjectMessage, MapMessage, or XMLMessage.

How does the JMS queue work in oaam server?

The flow of interaction is as follows: The application (JMS Sender) sends a message to the JMS Queue. It identifies the queue destination by the JNDI namespace. The queuing system receives the message from the JMS Sender and routes the message to the destination. OAAM Server listens for the message with the configured JMS Listener.