activemq-artemis/examples/features/standard/rest/dup-send/readme.md

# Rest Duplicate Send Example

This is an example of using duplicate detection for posted messages.  The first file to look at is:

src/main/resource/activemq-rest.xml

You see that by default, all messages posted to msg-create URLs will follow the duplicate detection pattern talked
about in the documentation.

To run the example you will need 3 shell-script windows (or you'll need to run 2 processes in background)

Step 1:

    mvn jetty:run

This will bring up ActiveMQ Artemis and the ActiveMQ Artemis REST Interface.

Step 2:

    mvn exec:java -Dexec.mainClass="ReceiveOrder"

This will bring up a REST client that is continuously pulling the broker through a consume-next (see doco for details).

Step 3:

    mvn exec:java -Dexec.mainClass="PostOrder"

This class will post 3 orders.  The first order will cause the 307 redirection as stated in the docs.  A 2nd order
will be posted twice through the same consume-next URL.  You'll see from the ReceiveOrder process that only 2 messages
are actually processed through the queue (instead of the 3 posts that were done).

Step 4:

In Step 4, you will use the create-with-id URL published by the container.  To run the example, you must pass in
your own order id.  For example:

    mvn exec:java -Dexec.mainClass="PostOrderWithId" -Dexec.args="001"

If you run this program with the same argument you'll see that only one of the messages passes through the queue
and is consumed by the ReceiveOrder process.  Pass a different string to `-Dexec.args` to post a new message that
isn't caught by the dup-detection facility.