Read this article for an intro.
As we mentioned before, transactions give you special powers as a developer but to get the most out of transactions in your applications, you should understand how to use the app server or framework to your best advantage. The article should help with that.
The samples provided here show you how to get started with transactions using the Spring framework and IBM MQ.
We’ve provided you with some basic building blocks to help you on your way.
- Get a queue manager
- Open MQ Console
- Set up a backout queue
- Clone this repo
- Build with Maven
- Try out the samples
Follow this tutorial in IBM Developer MQ hub for full instructions.
If you've already used Docker, just run these commands to get set up:
Get the latest container image:
docker pull icr.io/ibm-messaging/mq:latest
Check you got the image:
docker images
You'll see:
REPOSITORY TAG IMAGE ID CREATED SIZE
icr.io/ibm-messaging/mq latest a583b9db53a6 5 weeks ago 989MB
Create a volume to preserve data separate from the container:
docker volume create qm1data
Run the container:
docker run --env LICENSE=accept --env MQ_QMGR_NAME=QM1 --volume qm1data:/mnt/mqm --publish 1414:1414 --publish 9443:9443 --detach --env MQ_APP_PASSWORD=passw0rd icr.io/ibm-messaging/mq:latest
Check the container is up and running:
docker ps
You'll see:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
someID icr.io/ibm-messaging/mq:latest "runmqdevserver" 2 days ago Up 2 days 0.0.0.0:1414->1414/tcp, 0.0.0.0:9443->9443/tcp, 9157/tcp cool_name
Once the container with the queue manager is running, you should be able to access the MQ Console in your browser https://localhost:9443/ibmmq/console/login.html
Log in with user admin and password passw0rd.
Click the Manage QM1 tile.
You'll see several pre-configured queues. Keep your browser window open on this page, this is where you'll be checking for messages when you start playing with the samples.
Click the Create + button to create a backout queue for the DEV.QUEUE.1. This is where the JMS code will put any messages that are rolled back.
Click the Local tile to choose the queue type.
Name your queue BACKOUT.Q.
Click Create.
You'll see your new backout queue at the top of the list of queues on the Manage queue manager QM1 page.
Click the three dots at the end of the row of the BACKOUT.Q to open the list of options.
Click Configuration then click the Security tab.
Click the three dots at the end of the app row, then click Edit.
Tick the Pass all context box, click Save.
Go back to the page with all the queues by clicking the QM1 link in the breadcrumb menu at the top of the page.
We'll be using the DEV.QUEUE.1 and DEV.QUEUE.2 as our two target queues. You need to tell these queues the name of the backout queue where JMS will put messages that can't be committed.
Click the three dots at the end of the row of the DEV.QUEUE.1 to open the list of options then click Configuration.
Click the Edit button, then Storage. Fill in the Backout requeue queue field with BACKOUT.Q.
Set the Backout threshold to 3.
Hit the Save button.
Do the same for DEV.QUEUE.2.
Scroll back to the top and click the QM1 link to get back to the page with the queues.
Keep this page open.
Clone or download this repo to your local machine.
To clone:
git clone git@github.com:ibm-messaging/mq-dev-patterns.git
Move into the mq-dev-patterns/transactions/JMS/Spring directory.
cd mq-dev-patterns/transactions/JMS/Spring
Both the request-response and the simple directories contain a 'pom.xml' configuration file that include dependencies to enable you to build or compile the samples without the need to download individual libraries.
We pull in the following
- mq-jms-spring-boot-starter with classes and beans that abstract the details for connecting to and interacting with MQ objects when using Spring. This pulls in other pre-req libraries
To compile or build, start from a root of either sample directory:
cd request-response
or
cd simple
For either sample the Maven build command is the same, run as follows:
mvn clean package dependency:copy-dependencies
To run the simple sample:
java -cp "target/classes/:target/dependency/*" com.ibm.mq.samples.jms.Application
To run the request response sample:
java -cp "target/classes/:target/dependency/*" com.ibm.mq.samples.jms.Requester
We'll repeat these commands in the individual instructions README files for each of the samples.
You should now be ready to try out the samples. Pick one and click the link for further instructions.
-
- Transacted context
- Commit
- Rollback
-
Request response Spring app with IBM MQ
- Transacted context on the responder/listener side
- Use of commit and rollback