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wsat-simple: WS-AT (WS-AtomicTransaction) - Simple

The wsat-simple quickstart demonstrates a WS-AT (WS-AtomicTransaction) enabled JAX-WS Web service, bundled as a WAR, and deployed to WildFly.

What is it?

The wsat-simple quickstart demonstrates the deployment of a WS-AT (WS-AtomicTransaction) enabled JAX-WS Web service bundled in a WAR archive for deployment to WildFly Application Server.

The Web service is offered by a Restaurant for making bookings. The Service allows bookings to be made within an Atomic Transaction.

This example demonstrates the basics of implementing a WS-AT enabled Web service. It is beyond the scope of this quick start to demonstrate more advanced features. In particular:

  • The Service does not implement the required hooks to support recovery in the presence of failures.

  • It also does not utilize a transactional back-end resource.

  • Only one web service participates in the protocol. As WS-AT is a 2PC coordination protocol, it is best suited to multi-participant scenarios.

For a more complete example, please see the XTS demonstrator application that ships with the Narayana project: http://narayana.io/.

It is also assumed that you have an understanding of WS-AtomicTransaction. For more details, read the XTS documentation that ships with the Narayana project: http://narayana.io/docs/product.

The application consists of a single JAX-WS web service that is deployed within a WAR archive. It is tested with a JBoss Arquillian enabled JUnit test.

When running the org.jboss.as.quickstarts.wsat.simple.ClientTest#testCommit() method, the following steps occur:

  1. A new Atomic Transaction (AT) is created by the client.

  2. An operation on a WS-AT enabled Web service is invoked by the client.

  3. The JaxWSHeaderContextProcessor in the WS Client handler chain inserts the WS-AT context into the outgoing SOAP message

  4. When the service receives the SOAP request, the JaxWSHeaderContextProcessor in its handler chain inspects the WS-AT context and associates the request with this AT.

  5. The Web service operation is invoked…

  6. A participant is enlisted in this AT. This allows the Web Service logic to respond to protocol events, such as Commit and Rollback.

  7. The service invokes the business logic. In this case, a booking is made with the restaurant.

  8. The backend resource is prepared. This ensures that the Backend resource can undo or make permanent the change when told to do so by the coordinator.

  9. The client can then decide to commit or rollback the AT. If the client decides to commit, the coordinator will begin the 2PC protocol. If the participant decides to rollback, all participants will be told to rollback.

There is another test that shows what happens if the client decides to rollback the AT.

Start the WildFly Standalone Server

You must start WildFly with the XTS subsystem enabled.

  1. Edit the log level to reduce the amount of log output. This should make it easier to read the logs produced by this example. To do this add the following logger block to the EAP_HOME/docs/examples/configs/standalone-xts.xml of your JBoss distribution. You should add it just below one of the other logger blocks.

    <logger category="org.apache.cxf.service.factory.ReflectionServiceFactoryBean">
    <level name="WARN"/>
</logger>

  2. Open a terminal and navigate to the root of the WildFly directory.

  3. Start the WildFly server with XTS subsystem enabled by typing the following command.

    $ WILDFLY_HOME/bin/standalone.sh --server-config=../../docs/examples/configs/standalone-xts.xml
    Note
    		 For Windows, use the WILDFLY_HOME\bin\standalone.bat script.

Investigate the Console Output

When you run the Arquillian tests, Maven prints summary of the performed tests to the console. You should see the following results.

Results :

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
Note

You see the following warning when you run the Arquillian tests in remote mode.

WARNING: Configuration contain properties not supported by the backing object org.jboss.as.arquillian.container.remote.RemoteContainerConfiguration
Unused property entries: {serverConfig=../../docs/examples/configs/standalone-xts.xml}
Supported property names: [managementAddress, password, managementPort, managementProtocol, username]

This is because, in remote mode, you are responsible for starting the server with the XTS subsystem enabled. When you run the Arquillian tests in managed mode, the container uses the serverConfig property defined in the arquillian.xml file to start the server with the XTS subsystem enabled.

Investigate the Server Log

The following messages should appear in the server log. The messages trace the steps taken by the tests. Note there may be other informational log messages interlaced between these.

Test rollback:

10:54:29,607 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-4) Starting 'testRollback'. This test invokes a WS within an AT. The AT is later rolled back, which causes the back-end resource(s) to be rolled back.
10:54:29,607 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-4) [CLIENT] Creating a new WS-AT User Transaction
10:54:29,608 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-4) [CLIENT] Beginning Atomic Transaction (All calls to Web services that support WS-AT wil be included in this transaction)
10:54:29,932 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-4) [CLIENT] invoking makeBooking() on WS
10:54:30,000 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-25) [SERVICE] Restaurant service invoked to make a booking
10:54:30,000 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-25) [SERVICE] Enlisting a Durable2PC participant into the AT
10:54:30,121 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-25) [SERVICE] Invoking the back-end business logic
10:54:30,122 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-25) [SERVICE] makeBooking called on backend resource.
10:54:30,126 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-4) [CLIENT] rolling back Atomic Transaction (This will cause the AT and thus the enlisted back-end resources to rollback)
10:54:30,349 INFO  [stdout] (TaskWorker-2) [SERVICE] one or more participants voted 'aborted' or a failure occurred, so coordinator tells the participant to rollback
10:54:30,350 INFO  [stdout] (TaskWorker-2) [SERVICE] rollback called on backend resource.

Test commit:

10:54:30,662 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-54) Starting 'testCommit'. This test invokes a WS within an AT. The AT is later committed, which causes the back-end resource(s) to be committed.
10:54:30,663 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-54) [CLIENT] Creating a new WS-AT User Transaction
10:54:30,663 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-54) [CLIENT] Beginning Atomic Transaction (All calls to Web services that support WS-AT wil be included in this transaction)
10:54:30,797 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-54) [CLIENT] invoking makeBooking() on WS
10:54:30,848 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-66) [SERVICE] Restaurant service invoked to make a booking
10:54:30,849 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-66) [SERVICE] Enlisting a Durable2PC participant into the AT
10:54:30,936 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-66) [SERVICE] Invoking the back-end business logic
10:54:30,937 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-66) [SERVICE] makeBooking called on backend resource.
10:54:30,942 INFO  [stdout] (http-localhost.localdomain/127.0.0.1:8080-54) [CLIENT] committing Atomic Transaction (This will cause the AT to complete successfully)
10:54:31,046 INFO  [stdout] (TaskWorker-2) [SERVICE] Prepare called on participant, about to prepare the back-end resource
10:54:31,046 INFO  [stdout] (TaskWorker-2) [SERVICE] prepare called on backend resource.
10:54:31,047 INFO  [stdout] (TaskWorker-2) [SERVICE] back-end resource prepared, participant votes prepared
10:54:31,067 WARN  [com.arjuna.wst] (TaskWorker-2) ARJUNA043219: Could not save recovery state for non-serializable durable WS-AT participant restaurantServiceAT:ba222c73-00c3-4ecc-921c-80fd5dfdc11a
10:54:31,209 INFO  [stdout] (TaskWorker-2) [SERVICE] all participants voted 'prepared', so coordinator tells the participant to commit
10:54:31,210 INFO  [stdout] (TaskWorker-2) [SERVICE] commit called on backend resource.
Note
 You can ignore the warning message ARJUNA043219: Could not save recovery state for non-serializable durable WS-AT participant restaurantServiceAT that is printed in the server console. This quickstart does not implement the required recovery hooks in the interest of making it easy to follow. In a real world production application, you should provide the required recovery code. For more information, see http://narayana.io/docs/product.

This quickstart is more complex than the others. It requires that you configure the WildFly server to use the standalone-xts.xml configuration file, which is located in an external configuration directory.

  1. Import the quickstart into JBoss Developer Studio.

  2. If you have not already done so, you must configure a new WildFly server to use the XTS configuration.

    • In the Servers tab, right-click and choose New → Server.

    • Under Select the server type:, expand Red Hat JBoss Middleware and choose {jbdsEapServerName}.

    • For the Server name, enter WildFly XTS Configuration and click Next.

    • In the Create a new Server Adapter dialog, choose Create a new runtime (next page) from the drop-down menu and click Next.

    • In the JBoss Runtime dialog, enter the following information and then click Finish.

      Name: WildFly XTS Runtime
Home Directory: Browse to the EAP_HOME directory and select it.
Runtime JRE: Choose an alternate JRE if not correct.
Server base directory: This should already point to your standalone server configuration directory,
Configuration file: ../../docs/examples/configs/standalone-xts.xml

  3. Start the new WildFly XTS Configuration server.

  4. Right-click on the {artifactId} project, choose Run As → Maven build, enter clean verify -Parq-remote for the Goals, and click Run to run the Arquillian tests. The test results appear in the console.