JBoss ESB 4.2 Milestone Release 3
Getting Started With JBoss ESB
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JBoss ESB 4.2 Milestone Release 3
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About This Guide 5
What This Guide Contains 5
Documentation Conventions 6
Additional Documentation 7
Contacting Us 7
Getting Started 8
Four Simple Steps to get up and running. 9
The Hello World QuickStart 9
Components of the QuickStart 11
ESB Aware and Unaware Messages 12
QuickStart Sequence of Events 13
About This Guide
The goal of this document is assist you in getting up and running with test applications on JBossESB as quickly as possible.
This guide is anyone who is responsible for using JBoss ESB 4.2 Milestone Release 3 installations and wants to know how to install and use it.
This guide contains the following chapter:
Chapter 1, Installation: This chapter reviews prerequisites (software needed to operate JBossESB), downloading JBossESB, and building JBossESB.
Chapter 2, Trailblazer: A quick summary of the trailblazer example.
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The following conventions are used in this guide:
Table 1 Formatting Conventions
In addition to this guide, the following guides are available in the JBoss ESB 4.2 Milestone Release 3 documentation set:
JBoss ESB 4.2 Milestone Release 3 Trailblazer Guide: Provides guidance for using the trailblazer example.
JBoss ESB 4.2 Milestone Release 3 Administration Guide: How to manage the ESB.
JBoss ESB 4.2 Milestone Release 3 Programmers Guide: How to use JBossESB.
JBoss ESB 4.2 Milestone Release 3 Release Notes: Information on the differences between this release and previous releases.
JBoss ESB 4.2 Milestone Release 3 Services Guides: Various documents related to the services available with the ESB.
Questions or comments about JBoss ESB 4.2 Milestone Release 3 should be directed to our support team.
The quickest way to get started using JBoss ESB is by running one of the quickstarts in the samples/quickstarts folder. This will also perform a basic validation of your system. Before doing this however, be sure to check that your system meets the following minimum requirements:
JDK 5 (v1.5.0_06 recommended)
Ant (v1.6.5 recommended)
JBoss Application Server 4.2.0.GA or JBoss ESB Server 4.2.0.MR3
There are three ways to run the ESB. You can deploy it to JBossAS/ JBoss ESB Server, run standalone, or run it to Tomcat. The first step is have to locate the 'deployment.properties' in the install directory, and edit the properties set in this file. This document assumes you have ant (1.6.5 or higher) and java5 installed on your machine, and that you have a fresh copy of JBoss AS. So now go and download the JBossESB 4.2.0.GA distribution from http://labs.jboss.com/portal/jbossesb/downloads
The Jboss ESB Server is provided as a convenient and lightweight container to deploy to. It contains the majority of the components of the JBoss application server, but does not contain EJB3. The main advantage of using the ESB Server over using the JBoss 4.2.0.GA application server is a much quicker boot time, which is helpful in development.
Edit your version of install/deployment.properties. Open this file and edit the following lines if needed:
# application server root directory
# the instance of jboss you are running(default)
Run 'ant' (default target). This will deploy the jbossesb.sar and a number of .esb package archives (jbossesb.esb, jbpm.esb, jbrules.esb, smooks.esb, spring.esb, soap.esb) to your application server.
You can deploy custom code (actions) by deploying the '.esb' archives into the deploy directory.
Start your appserver.
The ESB is packaged with base services that ship with the ESB. A service consist of action code + configuration. Both of which should be deployed in an .esb archive. You can deploy as many .esb archives as you please. You can specify the deployment order of the archives using the deployment.xml. Typically you would deploy the .esb archive to the 'deploy' directory. The idea behind the .esb archive is that it is a deployable service unit. It should enable you to move a service between servers simply by moving the .esb archive. An ESB archive is a zip file with a .esb extension, and has the following structure:
├───META-INF │ └───jboss-esb.xml │ └───<deployment.xml> │ └───MANIFEST.MF ├───<java classes> ├───<jars> ├───<queue-service.xml>
the jboss-esb.xml contains the service configuration (listener and actions), as well as provider configuration.
the deployment.xml is optional, but can be used for 2 reasons:
make this .esb archive depend on other archives, to specify classloading order.
make the deployment of this .esb archive scoped.
you custom action classes.
additional jar archives your actions depend on.
queue-service.xml, if your 'provider' section references queues or topics you can deploy their configuration in the .esb archive. Note that any other way to deploy these queues is fine too, we just recommend this to keep your deployments as self-contained as possible and therefore to keep dependency management simple.
JBossESB ships with a number of standard service archives:
smooks.esb - default message transformation engine Smooks.
These services are deployed by default, but you should be able to remove them if you don't need these service deployments.
Note that you cannot (yet) deploy esb archives to the Tomcat deployment.
This QuickStart allows you get up and running with JBoss ESB, out of the box. It is located in the distribution under samples/quickstarts/helloworld.
To run this QuickStart:
Start your Server in a way that allows you to view the output console. If you are on Windows, it is preferable not to run JBoss as a Windows Service for the purposes of this guide.
From a command terminal window, change directory into the samples/quickstarts/helloworld directory.
Make sure that install/deployment.properties has the correct config and home directory settings for your server.
Type “ant deploy” to deploy the helloworld .esb package archive to your application server.
Type “ant runtest”.
Switch back to your application server's console. You should soon see a “Hello World” message appear in your application server's console.
That's it! The QuickStart ran successfully. Your environment is properly configured for JBoss ESB.
You can find more detailed directions on how to setup the quickstart examples by running “ant help-quickstarts” under any of the specific quickstart directories. To get information on how to run a particular quickstart under different deployment scenarios, change directory to the specific quickstart and type “ant help”.
The following diagram illustrates the sequence of events that take place in this QuickStart. It touches on a number of the key concepts within JBoss ESB1.
Window1 shows each of the main “ESB” components used in this sample:
Service Registry: This is a JAXR Registry implementation. In this QuickStart, the registry uses RMI based communication. See docs/services/RegistryConfiguration.pdf for more details on the Registry Service.
JMS Gateway Listener: A “Gateway Listener” is one of the key architectural components within JBoss ESB. This listener type is, as its name would suggest, the gateway to the ESB from endpoints outside the domain of the ESB. In this case, we're using a JMS Gateway.
The ESB Aware Service Listener: The “FirstService:SimpleListener” ESB Aware Service Listener listens for “ESB Aware” messages on “queue/quickstart_helloworld_Request_gw”. This introduces you further to the concept of ESB “Aware” and “Unaware” messages. We will touch on these next.
JBoss ESB has a well defined concept of what a message is. This is defined fully in xml/message.xsd. This construct makes it possible to pass decorated messages payloads between components of the ESB. The message payload is typically stored in the message “Body” (see the Programmers Guide).
This makes a lot of sense from the point of Services in within the ESB domain being able to collaborate effectively. However, it is not practical to expect endpoints outside the domain of a JBoss ESB deployment to be “aware” of these internal ESB constructs. For this reason, JBoss ESB has the concept of ESB Aware and Unaware Messages and Endpoints, with the Gateway acting as the bridge (adapter) between the two worlds.
After starting the ESB in Window1 and before any “Hello World” messages are put on the bus, the “FirstService:SimpleJMSService“ Service is registered with the Registry Service.
The sequence of events in the Hello World QuickStart are as follows:
ESB Unaware JMS Client endpoint puts an ESB Unaware “Hello World” Message (plain String Object) into JMS Queue “queue/quickstart_helloworld_Request”.
The JMS Gateway Listener receives the ESB Unaware message. The Gateways Job is to adapt this message by making it an ESB Aware Message for consumption by an ESB Aware Endpoint.
The JMS Gateway Listener uses the registry to lookup the Endpoint Reference (EPR) for “FirstService:SimpleJMSService” Service. This works out to be JMS Queue “queue/quickstart_helloworld_Request_gw”.
The JMS Gateway Listener “adapts” the message into an ESB Aware message and places it into JMS Queue “queue/=quickstart_helloworld_Request_gw”.
“FirstService:SimpleJMSService” Service receives the message.
“FirstService:SimpleJMSService” Service extracts the payload from the message and prints it to the console.
Once you have successfully run the Helloworld QuickStart and understand the concepts involved, there are many other Quickstarts to try. Please note that the Quickstarts have different requirements which are documented in their respective readme.txt, and that not all of the Quickstarts will run in every deployment. Below is a suggested map of Quickstarts to follow in order :
JBoss TrailBlazers and Demo Applications are designed to help you get up and running quickly with JBoss products and technologies. We encourage you to Run them, Download them, and enjoy the learning process!
The Loan Broker TrailBlazer example was developed to verify your JBossESB installation and also to exhibit some of the numerous capabilities of JbossESB. This example was based on information from www.eaipatterns.org, along with the example found at JavaZone 2005.
For details of configuring and running the TrailBlazer, see the accompanying “Trailblazer” document.
1 Use the “Zoom” features of you viewer to see the diagram in more detail.