Getting Started With JBoss ESB
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JBoss ESB 4.2 Milestone Release 1
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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 1 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 1 documentation set:
JBoss ESB 4.2 Milestone Release 1 Trailblazer Guide: Provides guidance for using the trailblazer example.
JBoss ESB 4.2 Milestone Release 1 Administration Guide: How to manage the ESB.
JBoss ESB 4.2 Milestone Release 1 Programmers Guide: How to use JBossESB.
JBoss ESB 4.2 Milestone Release 1 Release Notes: Information on the differences between this release and previous releases.
JBoss ESB 4.2 Milestone Release 1 Services Guides: Various documents related to the services available with the ESB.
Questions or comments about JBoss ESB 4.2 Milestone Release 1 should be directed to our support team.
After downloading and expanding the JBoss ESB 4.0 GA distribution, you should have the following file structure.
├───docs │ └───services ├───install ├───javadocs ├───lib │ └───ext ├───samples │ ├───quickstarts │ │ ├───aggregator │ │ ├───business_service │ │ ├───fun_cbr │ │ ├───helloworld │ │ ├───helloworld_action │ │ ├───helloworld_db_registration │ │ ├───helloworld_embedded_reg │ │ ├───helloworld_file_action │ │ ├───helloworld_ftp_action │ │ ├───helloworld_sql_action │ │ ├───more_action │ │ ├───simple_cbr │ │ ├───static_router │ │ ├───transform_EDI2XML_Groovy_XSLT │ │ ├───transform_XML2POJO │ │ ├───transform_XML2XML_date_manipulation │ │ ├───transform_XML2XML_simple │ │ └───webservice_war1 │ └───trailblazer │ ├───banks │ ├───client │ ├───esb │ └───template ├───tools │ └───console └───xml └───common
The quickest way to get started using JBoss ESB is through 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 v4.0.5GA [with ejb3]
There are three ways to run the ESB. You can deploy it to JBossAS, to Tomcat, or run it in standalone mode. In any case you 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 4.0GA distribution from http://labs.jboss.com/portal/jbossesb/downloads
The jbossesb-server can be downloaded as a separate download and is fully configured.
You can deploy custom code in '.esb' archives.
Start the esb-server
Edit your version of the 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'. This will deploy the esb to your JBossAS instance. It copies the jbossesb.sar into your deploy directory.
You can deploy custom code (actions) by deploying the '.esb' archives into the deploy directory.
Start your appserver.
Edit your version of the deployment.properties. Open this file and edit the following line if needed ######################################################################
# jbossesb tomcat home directory
Run 'ant tomcat'. This will deploy the esb to your tomcat instance. It creates a jbossesb.war deploy directory in your tomcat.home/webapps directory.
Follow the steps in the tomcat/README.txt if you do not yet have a juddi database. Note that the JBossAS deploy comes with a preconfigured hsqldb.
You can deploy custom code (actions) by deploying the jar to the tomcat.home/webapps/jbossesb/WEB-INF/lib directory
Start tomcat and see:
12:12:20,875 INFO [ParamFileRepository] Setting parameter repository root dir t
12:12:21,546 INFO [Generator] Serializing ESB Aware Listener 'ConfigTree' confi
guration to [C:\apache-tomcat-5.5.20\conf\jbossesb-listener.xml].
12:12:21,578 INFO [Generator] Serializing ESB Gateway 'ConfigTree' configuratio
n to [C:\apache-tomcat-5.5.20\conf\jbossesb-gateway.xml].
12:12:21,578 INFO [ConfigurationController] Parameter reload completed.
12:12:21,593 INFO [ConfigurationController] Configuration Controller instance s
Jan 30, 2007 12:12:22 PM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Jan 30, 2007 12:12:22 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Jan 30, 2007 12:12:22 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/31 config=null
Jan 30, 2007 12:12:22 PM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Jan 30, 2007 12:12:22 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2813 ms
An ESB archive is a zip file with a .esb extension, and has the following structure:
├───META-INF │ └───jboss-esb.xml │ └───MANIFEST.MF ├───<java classes> ├───<queue-service.xml>
The custom action classes can be put in the root of the archive. Optionally you can provide a queue-service.xml if to bring up JMS queues or topics that are specific for this ESB package.
Finally, the configuration of the package goes in the META-INF/jboss-esb.xml.
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:
Copy samples/quickstarts/esb-quickstart-service.xml to your JBoss Application Server (/jboss-4.0.5.GA/server/default/deploy) or rely on the queue-service.xml definitions if you opt to deploy the esb package. This will bring up all the JMS Queues you need to run the quickstarts. Note that the ESB can interact with any JMS provider, but ships with JBossMessaging. So our examples use JBossMessaging, which is the default provider in JBossesb-server-4.0.1. Note that we have also tested JBossMQ, MQSeries and ActiveMQ.
Update the “jbosshome.dir” property setting in samples/quickstarts/quickstarts.properties to reference location of your Server.
Start your Server.
From a command terminal window (“Window1”), change directory into the samples/quickstarts/helloworld directory.
In Window1, type “ant” to run the ESB as a JAVA application, or run “ant deploy” to deploy the .esb archive.
This will start the ESB Message “Listeners”. Wait for “**Listener Ready**” to appear on the terminal window. The ESB is now running!
Open a 2nd command terminal window (“Window2”) and change director to samples/quickstarts/helloworld again.
In Window2, type “ant runtest”.
Switch back to Window1. You should soon see a “Hello World” message appear in the terminal window.
That's it! The QuickStart ran successfully. Your environment is properly configured for JBoss ESB.
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 is using an embedded Datastore as the Service repository (Hypersonic). 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:SimpleJMSService” ESB Aware Service Listener listens for “ESB Aware” messages on “queue/B”. 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/B”.
The JMS Gateway Listener “adapts” the message into an ESB Aware message and places it into JMS Queue “queue/B”.
“FirstService:SimpleJMSService” Service receives the message.
“FirstService:SimpleJMSService” Service extracts the payload from the message and prints it to the console.
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.