The Java EE 5 Tutorial (PDF) - Oracle Software Downloads

Writing Simple JMS Client Applications
914
The result, however, is different. Because you are using a topic, messages that were sent
before you started the consumer cannot be received. (See “Publish/Subscribe Messaging
Domain” on page 895, for details.) Instead of receiving the messages, the program
appears to hang.
7. Run the Producer example again. Right-click the producer project and choose Run.
Now the SynchConsumer example receives the messages:
Destination type is topic
Reading message: This is message 1
Reading message: This is message 2
Reading message: This is message 3
You can also run the sample programs using the appclient command. Each of the programs
takes one or more command-line arguments: a destination type and, for Producer, a number of
messages.
To run the clients using the appclient command, follow these steps:
1. In a terminal window, go to the producer/dist directory:
cd ../producer/dist
2. Run the Producer program, sending three messages to the queue:
appclient -client producer.jar queue 3
The output of the program looks like this:
Destination type is queue
Sending message: This is message 1
Sending message: This is message 2
Sending message: This is message 3
The messages are now in the queue, waiting to be received.
3. In the same window, go to the synchconsumer/dist directory:
cd ../../synchconsumer/dist
4. Run the SynchConsumer program, specifying the queue:
appclient -client synchconsumer.jar queue
The output of the program looks like this:
Destination type is queue
Reading message: This is message 1
Reading message: This is message 2
Reading message: This is message 3
5. Now try running the programs in the opposite order. Run the SynchConsumer program. It
displays the destination type and then appears to hang, waiting for messages.
appclient -client synchconsumer.jar queue
The Java EE 5Tutorial • June 2010