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< title > ActiveMQ Artemis JMS Context Example< / title >
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< h1 > JMS Context Example< / h1 >
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< p > This example shows you how to send and receive a message to a JMS Queue using ActiveMQ Artemis by using a JMS Context< / p >
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< p > A JMSContext is part of JMS 2.0 and combines the JMS Connection and Session Objects into a simple Interface< / p >
< h2 > Example step-by-step< / h2 >
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< p > < i > To run the example, simply type < code > mvn verify -Pexample< / code > from this directory< / i > < / p >
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< ol >
< li > First we need to get an initial context so we can look-up the JMS connection factory and destination objects from JNDI. This initial context will get it's properties from the < code > client-jndi.properties< / code > file in the directory < code > ../common/config< / code > < / li >
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< code > InitialContext initialContext = getContext();< / code >
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< li > We look-up the JMS queue object from JNDI< / li >
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< code > Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");< / code >
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< li > We look-up the JMS connection factory object from JNDI< / li >
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< code > ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");< / code >
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< li > We create a JMS context< / li >
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< code > jmsContext = cf.createContext();< / code >
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< li > We create a JMS Producer, set the delivery mode and send a message all in one line. Note that we don't pass
a message to the send method but just a String.< / li >
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< code > jmsContext.createProducer().setDeliveryMode(DeliveryMode.PERSISTENT).send(queue, "this is a string")< / code >
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< li > We create a JMS message consumer and receive the payload of the message directly< / li >
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< code > String payLoad = jmsContext.createConsumer(queue).receiveBody(String.class);< / code >
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< li > We create a JMS text message that we are going to send.< / li >
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< code > TextMessage message = session.createTextMessage("This is a text message");< / code >
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< li > And finally, < b > always< / b > remember to close your JMS connections and resources after use, in a < code > finally< / code > block. Closing a JMS connection will automatically close all of its sessions, consumers, producer and browser objects< / li >
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< code > finally
{
if (initialContext != null)
{
initialContext.close();
}
if (jmsContext != null)
{
jmsContext.close();
}
}< / code >
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