# Last-Value Queues Last-Value queues are special queues which discard any messages when a newer message with the same value for a well-defined Last-Value property is put in the queue. In other words, a Last-Value queue only retains the last value. A typical example for Last-Value queue is for stock prices, where you are only interested by the latest value for a particular stock. ## Configuring Last-Value Queues Last-value queues are defined in the address-setting configuration: <address-setting match="jms.queue.lastValueQueue"> <last-value-queue>true</last-value-queue> </address-setting> By default, `last-value-queue` is false. Address wildcards can be used to configure Last-Value queues for a set of addresses (see [here](wildcard-syntax.md)). ## Using Last-Value Property The property name used to identify the last value is `"_AMQ_LVQ_NAME"` (or the constant `Message.HDR_LAST_VALUE_NAME` from the Core API). For example, if two messages with the same value for the Last-Value property are sent to a Last-Value queue, only the latest message will be kept in the queue: ``` java // send 1st message with Last-Value property set to STOCK_NAME TextMessage message = session.createTextMessage("1st message with Last-Value property set"); message.setStringProperty("_AMQ_LVQ_NAME", "STOCK_NAME"); producer.send(message); // send 2nd message with Last-Value property set to STOCK_NAME message = session.createTextMessage("2nd message with Last-Value property set"); message.setStringProperty("_AMQ_LVQ_NAME", "STOCK_NAME"); producer.send(message); ... // only the 2nd message will be received: it is the latest with // the Last-Value property set TextMessage messageReceived = (TextMessage)messageConsumer.receive(5000); System.out.format("Received message: %s\n", messageReceived.getText()); ``` ## Example See the [examples](examples.md) chapter for an example which shows how last value queues are configured and used with JMS.