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WS-AT (WS-AtomicTransaction) - Simple

  • Author:
  • Contributors: Sande Gilda, Pete Muir
  • Last Update: Nov 26, 2013
  • Level: Intermediate
  • Technologies: WS-AT, JAX-WS
  • Target Product: EAP

What is it?

This example demonstrates the deployment of a WS-AT (WS-AtomicTransaction) enabled JAX-WS Web service bundled in a WAR archive for deployment to Red Hat JBoss Enterprise Application Platform.

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:

  1. The Service does not implement the required hooks to support recovery in the presence of failures.
  2. It also does not utilize a transactional back end resource.
  3. 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 JBossTS project: http://www.jboss.org/jbosstm.

It is also assumed that you have an understanding of WS-AtomicTransaction. For more details, read the XTS documentation that ships with the JBossTS project, which can be downloaded here: http://www.jboss.org/jbosstm/downloads/JBOSSTS416_0_Final

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.

System requirements

The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 6.1 or later.

All you need to build this project is Java 6.0 (Java SDK 1.6) or later, Maven 3.0 or later.

Configure Maven

If you have not yet done so, you must Configure Maven before testing the quickstarts.

Start the JBoss Server with the Custom Options

First, 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 ./docs/examples/configs/standalone-xts.xml of your JBoss distribution. You should add it just bellow one of the other logger blocks.

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

Next you need to start JBoss EAP with the XTS sub system enabled. This is enabled through the optional server configuration standalone-xts.xml. To do this, run the following commands from the top-level directory of JBossAS:

    For Linux:     ./bin/standalone.sh --server-config=../../docs/examples/configs/standalone-xts.xml
    For Windows:   \bin\standalone.bat --server-config=..\..\docs\examples\configs\standalone-xts.xml

Run the Arquillian Tests

This quickstart provides Arquillian tests. By default, these tests are configured to be skipped as Arquillian tests require the use of a container.

NOTE: The following commands assume you have configured your Maven user settings. If you have not, you must include Maven setting arguments on the command line. See Run the Arquillian Tests for complete instructions and additional options.

  1. Make sure you have started the JBoss Server as described above.
  2. Open a command line and navigate to the root directory of this quickstart.
  3. Type the following command to run the test goal with the following profile activated:

     mvn clean test -Parq-jbossas-remote 
    

Investigate the Server Log

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

Test commit:

14:06:28,208 INFO  [stdout] (management-handler-threads - 14) 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.
14:06:28,209 INFO  [stdout] (management-handler-threads - 14) [CLIENT] Creating a new WS-AT User Transaction
14:06:28,209 INFO  [stdout] (management-handler-threads - 14) [CLIENT] Beginning Atomic Transaction (All calls to Web services that support WS-AT wil be included in this transaction)
14:06:28,532 INFO  [stdout] (management-handler-threads - 14) [CLIENT] invoking makeBooking() on WS
14:06:29,168 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Restaurant service invoked to make a booking
14:06:29,168 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Enlisting a Durable2PC participant into the AT
14:06:29,410 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Invoking the back-end business logic
14:06:29,410 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] makeBooking called on backend resource.
14:06:29,411 INFO  [stdout] (management-handler-threads - 14) [CLIENT] committing Atomic Transaction (This will cause the AT to complete successfully)
14:06:29,974 INFO  [stdout] (TaskWorker-3) [SERVICE] Prepare called on participant, about to prepare the back-end resource
14:06:29,974 INFO  [stdout] (TaskWorker-3) [SERVICE] prepare called on backend resource.
14:06:29,974 INFO  [stdout] (TaskWorker-3) [SERVICE] back-end resource prepared, participant votes prepared
14:06:30,560 INFO  [stdout] (TaskWorker-3) [SERVICE] all participants voted 'prepared', so coordinator tells the participant to commit
14:06:30,560 INFO  [stdout] (TaskWorker-3) [SERVICE] commit called on backend resource.

Test rollback:

14:06:31,163 INFO  [stdout] (management-handler-threads - 13) 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.
14:06:31,163 INFO  [stdout] (management-handler-threads - 13) [CLIENT] Creating a new WS-AT User Transaction
14:06:31,164 INFO  [stdout] (management-handler-threads - 13) [CLIENT] Beginning Atomic Transaction (All calls to Web services that support WS-AT wil be included in this transaction)
14:06:31,461 INFO  [stdout] (management-handler-threads - 13) [CLIENT] invoking makeBooking() on WS
14:06:32,094 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Restaurant service invoked to make a booking
14:06:32,094 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Enlisting a Durable2PC participant into the AT
14:06:32,297 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] Invoking the back-end business logic
14:06:32,322 INFO  [stdout] (http-localhost-127.0.0.1-8080-1) [SERVICE] makeBooking called on backend resource.
14:06:32,324 INFO  [stdout] (management-handler-threads - 13) [CLIENT] rolling back Atomic Transaction (This will cause the AT and thus the enlisted back-end resources to rollback)
14:06:32,818 INFO  [stdout] (TaskWorker-1) [SERVICE] one or more participants voted 'aborted' or a failure occurred, so coordinator tells the participant to rollback
14:06:32,818 INFO  [stdout] (TaskWorker-1) [SERVICE] rollback called on backend resource.

Run the Quickstart in JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts from Eclipse using JBoss tools. For more information, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts

Debug the Application

If you want to debug the source code or look at the Javadocs of any library in the project, run either of the following commands to pull them into your local repository. The IDE should then detect them.

    mvn dependency:sources
    mvn dependency:resolve -Dclassifier=javadoc

Build and Deploy the Quickstart - to OpenShift

Create an OpenShift Express Account and Domain

If you do not yet have an OpenShift account and domain, Sign in to OpenShift to create the account and domain. Get Started with OpenShift will show you how to install the OpenShift Express command line interface.

Create the OpenShift Application

Note that we use USER_DOMAIN_NAME for these examples. You need to substitute it with your own OpenShift account user name.

Open a shell command prompt and change to a directory of your choice. Enter the following command to create a JBoss EAP 6 application:

rhc app create -a wsatsimple -t jbosseap-6

NOTE: The domain name for this application will be wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com. Be sure to replace YOUR_DOMAIN_NAME with your own OpenShift account user name.

This command creates an OpenShift application called wsatsimple and will run the application inside the jbosseap-6 container. You should see some output similar to the following:

Application Options
-------------------
  Namespace:  YOUR_DOMAIN_NAME
  Cartridges: jbosseap-6 (addtl. costs may apply)
  Gear Size:  default
  Scaling:    no

Creating application 'wsatsimple' ... done

Waiting for your DNS name to be available ... done

Cloning into 'wsatsimple'...
Warning: Permanently added the RSA host key for IP address '54.237.58.0' to the list of known hosts.

Your application 'wsatsimple' is now available.

  URL:        http://wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com/
  SSH to:     52864af85973ca430200006f@wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com
  Git remote: ssh://52864af85973ca430200006f@wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com/~/git/wsatsimple.git/
  Cloned to:  CURRENT_DIRECTORY/wsatsimple

Run 'rhc show-app wsatsimple' for more details about your app.

The create command creates a git repository in the current directory with the same name as the application, in this case, wsatsimple. Notice that the output also reports the URL at which the application can be accessed. Make sure it is available by typing the published url http://wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com/ into a browser or use command line tools such as curl or wget. Be sure to replace YOUR_DOMAIN_NAME with your OpenShift account domain name.

Migrate the Quickstart Source

Now that you have confirmed it is working you can migrate the quickstart source. You do not need the generated default application, so navigate to the new git repository directory and tell git to remove the source and pom files:

    cd wsatsimple
    git rm -r src pom.xml

Copy the source for the wsat-simple quickstart into this new git repo:

    cp -r <quickstarts>/wsat-simple/src .
    cp <quickstarts>/wsat-simple/pom.xml .

Configure the OpenShift Server

Openshift does not have Web services or WS-AT enabled by default, so we need to modify the server configuration. To do this:

  1. Open the hidden .openshift/config/standalone.xml file in an editor.
  2. If the following extensions do not exist, add them under the <extensions> element:

     <extension module="org.jboss.as.webservices"/>
     <extension module="org.jboss.as.xts"/>
    
  3. If the jmx subsystem is not configured under the <profile> element, copy the following under the <profile> element to enable and configure JMX:

     <subsystem xmlns="urn:jboss:domain:jmx:1.1">
         <show-model value="true"/>
         <remoting-connector/>
     </subsystem>
    
  4. If the webservices subsystem is not configured under the <profile> element, copy the following under the <profile> element to enable and configure Web Services:

     <subsystem xmlns="urn:jboss:domain:webservices:1.1">
         <modify-wsdl-address>true</modify-wsdl-address>
         <wsdl-host>${env.OPENSHIFT_APP_DNS}</wsdl-host>
         <wsdl-port>80</wsdl-port>
         <endpoint-config name="Standard-Endpoint-Config"/>
         <endpoint-config name="Recording-Endpoint-Config">
             <pre-handler-chain name="recording-handlers" protocol-bindings="##SOAP11_HTTP ##SOAP11_HTTP_MTOM ##SOAP12_HTTP ##SOAP12_HTTP_MTOM">
                 <handler name="RecordingHandler" class="org.jboss.ws.common.invocation.RecordingServerHandler"/>
             </pre-handler-chain>
         </endpoint-config>
     </subsystem>
    
  5. If the xts subsystem is not configured under the <profile> element, copy the following under the <profile> element to enable and configure XTS:

     <subsystem xmlns="urn:jboss:domain:xts:1.0">
         <xts-environment url="http://${env.OPENSHIFT_INTERNAL_IP}:8080/ws-c11/ActivationService"/>
     </subsystem>
    
  6. To reduce the amount of logging and make it easier to read the logs produced by this quickstart, edit the log level by adding the following block just below the other blocks:

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

The .openshift/config/standalone.xml is now ready, so save it and exit your editor.

Deploy the OpenShift Application

You can now deploy the changes to your OpenShift application using git as follows:

    git add src pom.xml .openshift/config/standalone.xml
    git commit -m "wsat-simple quickstart on OpenShift"
    git push

OpenShift will build the application using Maven, and deploy it to JBoss EAP. If successful, you should see output similar to:

remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] BUILD SUCCESS
remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] Total time: 19.991s
remote: [INFO] Finished at: Wed Mar 07 12:48:15 EST 2012
remote: [INFO] Final Memory: 8M/168M
remote: [INFO] ------------------------------------------------------------------------
remote: Running .openshift/action_hooks/build
remote: Emptying tmp dir: /var/lib/libra/1e63c17c2dd94a329f21555a33dc617d/wsatsimple/jbossas-7/standalone/tmp/vfs
remote: Emptying tmp dir: /var/lib/libra/1e63c17c2dd94a329f21555a33dc617d/wsatsimple/jbossas-7/standalone/tmp/work
remote: Running .openshift/action_hooks/deploy
remote: Starting application...
remote: Done
remote: Running .openshift/action_hooks/post_deploy
To ssh://1e63c17c2dd94a329f21555a33dc617d@wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com/~/git/wsatsimple.git/
   e6f80bd..63504b9  master -> master

Note that the openshift profile in the pom.xml file is activated by OpenShift. This causes the WAR built by OpenShift to be copied to the deployments/ directory and deployed without a context path.

Test the OpenShift Application

Now you will start to tail the log files of the server. To do this run the following command, remembering to replace the application name and login id.

    rhc app tail -a wsatsimple

Once the app is deployed, you can test the application by accessing the following URL either via a browser or using tools such as curl or wget. Be sure to replace the YOUR_DOMAIN_NAME in the URL with your OpenShift account domain name.

http://wsatsimple-YOUR_DOMAIN_NAME.rhcloud.com/WSATSimpleServletClient

If the application has run successfully you should see some output in the browser. You should also see some output on the server log, similar to the output from the "Test commit" test above.

You can use the OpenShift command line tools or the OpenShift web console to discover and control the application.

Delete the OpenShift Application

When you are finished with the application you can delete it from OpenShift as follows:

    rhc app-delete -a wsatsimple

Note: There is a limit to the number of applications you can deploy concurrently to OpenShift. If the rhc app create command returns an error indicating you have reached that limit, you must delete an existing application before you continue.

  • To view the list of your OpenShift applications, type: rhc domain show
  • To delete an application from OpenShift, type the following, substituting the application name you want to delete: rhc app-delete -a APPLICATION_NAME_TO_DELETE

Recent Changelog

  • Nov 26, 2013(Sande Gilda):wsat simple Separate and clarify XTS subsystem configuration
  • Nov 26, 2013(Sande Gilda):Bz1034254 fix wsat simple OpenShift instructions
  • Nov 20, 2013(Sande Gilda):Bz1032834 Fix wording in wsat and wsba quickstarts about output messages going to the server log not the console
  • Nov 17, 2013(Sande Gilda):Bz1029445 Update OpenShift instructions to be more current with latest version
  • Nov 13, 2013(Sande Gilda):Revert Bz1029445 Remove OpenShift instructions from README files as they do not currently work
  • Nov 13, 2013(Sande Gilda):Bz1029445 Remove OpenShift instructions from README files as they do not currently work
  • Nov 8, 2013(Sande Gilda):Bz1028448 Add spaces to end of metadata so it renders with a line break in HTML
  • Oct 7, 2013(Sande Gilda):Merge from master to 6.2.x for ER5
  • Sep 24, 2013(Sande Gilda):Remove references to JBoss AS 7 from the quickstarts
  • Sep 23, 2013(Sande Gilda):Update metadata source URLs to new repository
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