Java Reference
In-Depth Information
The last thing this method does is to actually send the message to the message
queue. This is done by invoking the send() method on the javax.jms.
MessageProducer instance obtained in the previous line. This method takes an
instance of a class implementing javax.jms.Message or one of its subinterfaces
as a parameter, in the generated code, the generated method to create the message
( createJMSMessageForjmsMyQueue() in our example) is invoked inline, since this
method's return value is of the appropriate type.
Notice that most of the body of the generated method to send JMS messages is
enclosed in a try / finally block. Most of the lines inside the try block have the
potential of throwing a JMSException , if this happens, the code attempts to close the
JMS session and connection, which is the exact same thing that needs to be done if the
code ends normally, therefore it makes sense to put this code in the finally block.
Although it is possible to write standalone applications that can retrieve messages
from a messaging destination, most Java EE applications rely on message driven beans
for this task, and NetBeans makes it very easy to generate message driven beans.
Processing JMS messages with message
driven Beans
In order to create a message driven bean, we need to right-click on our EJB project
and select File | New , then select the Enterprise JavaBeans category and the
Message-Driven Bean file type.
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