JBoss ESB 4.0 CR2

Getting Started With JBoss ESB

JBESB-GS-1/11/07

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JBoss ESB 4.0 CR2

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Contents

About This Guide

What This Guide Contains

The goal of this document is assist you in getting up and running with test applications on JBossESB as quickly as possible.

Audience

This guide is anyone who is responsible for using JBoss ESB 4.0 CR2 installations and wants to know how to install and use it.

Prerequisites

None.

Organization

This guide contains the following chapter:

1. Chapter 1, Installation: This chapter reviews prerequisites (software needed to operate JBossESB), downloading JBossESB, and building JBossESB.

Documentation Conventions

The following conventions are used in this guide:

Table 1 Formatting Conventions

Additional Documentation

In addition to this guide, the following guides are available in the JBoss ESB 4.0 CR2 documentation set:

1. JBoss ESB 4.0 CR2 Programmer’s Guide: Provides guidance for writing applications.

2. JBoss ESB 4.0 CR2 TrailBlazer Guide: Provides a guide to understanding, configuring, deploying and running the LoanBroker TrailBlazer.

3. JBoss ESB 4.0 CR2 Configuring Hypersonic Guide: This is necessary for setting up the Hypersonic database if you want to use it within the trailblazer.

Contacting Us

Questions or comments about JBoss ESB 4.0 CR2 should be directed to our support team.

Chapter 1

Getting Started

After downloading and expanding the JBoss ESB 4.0 Release Candidate distribution, you should have the following file structure.

|-- docs
|   |-- config
|   `-- services
|-- install
|   |-- conf
|   |-- data
|   |-- deploy
|   |-- jUDDI-registry
|   `-- message-store
|-- javadocs
|-- lib
|-- samples
|   |-- docs
|   |-- quickstarts
|   |   |-- helloworld
|   |   |-- helloworld_action
|   |   |-- helloworld_embedded_reg
|   |   |-- more_action
|   |   |-- simple_cbr
|   |   `-- simple_transformation
|   `-- trailblazer
|       |-- banks
|       |-- client
|       |-- docs
|       |-- esb
|       |-- loanbroker
|       `-- template
|-- tools
|   `-- console
`-- xml

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:

1. JDK 5 (v1.5.0_06 recommended)

2. Ant (v1.6.5 recommended)

3. JBoss Application Server v4.0.4

Four Simple Steps to get up and running.

1. 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 4.0.x. So now go and download the JBossESB 4.0RC1 distribution from http://labs.jboss.com/portal/jbossesb/downloads

2. Go into the 'install' directory to find the deployment.properties-example. Open this file and edit the following lines:

   # application server root directory

org.jboss.esb.appserver.home=C:/cygwin/home/kstam/apps/jboss-4.0.4.GA

# the instance of jboss you are running (default)

org.jboss.esb.appserver.config=default

#the place where the jboss libraries can be found

# Note: You should not need to change this entry unless you altered

# the jbossesb distribution directory structure

org.jboss.esb.dist.lib=../lib

3. Run 'ant configure'. This will deploy the esb to your jboss AS instance. It copies the jbossesb.sar directory into your deploy directory.

4. Start your appserver and see the JBossESB heartbeat:

   11:37:35,546 INFO [Server] JBoss (MX MicroKernel) [4.0.4.GA (build: CVSTag=JBoss_4_0_4_GA date=200605151000)] Started in 23s:843ms

11:37:50,375 INFO [EsbListenerController] Reloading parameters _____________________________________________________

11:38:10,390 INFO [EsbListenerController] Reloading parameters _____________________________________________________

11:38:20,421 INFO [GatewayListenerController] Reloading parameters _____________________________________________________

11:38:20,453 WARN [GatewayListenerController] No value specified for: endTime - Will run forever (or until interrupted by user)

That's it. You've done it.

Note that in your server/default/conf directory you now have 2 new configuration files:

jbossesb-listener.xml
jbossesb-gateway.xml

You can add xml fragments in there and when the controller reload your listeners and gateways come up !!! So try pasting in xml from the Hello World config sample. When the listeners reload their parameters it will get picked up dynamically. Note that gateways reference listeners, so add the listeners first.

Finally note that the jbossesb.sar is pretty basic and if you want to use smooks, or jboss-rules for content-based-routing you will have to add them. More detailed instructions can be found elsewhere.

The Hello World QuickStart

This QuickStart allows you get up and running with JBoss ESB, out of the box. It is located in the distribution under samples/quickstarts/helloworl_embedded_reg¹.

To run this QuickStart:

1. Copy samples/quickstarts/esb-quickstart-service.xml to your JBoss Application Server (jboss-4.0.4.GA/server/default/deploy).

2. Update the “jbosshome.dir” property setting in samples/quickstarts/quickstarts.properties to reference location of your JBoss Application Server.

3. Start you JBoss Application Server.

4. From a command terminal window (“Window1”), change directory into the samples/quickstarts/helloworld_embedded_reg directory.

5. In Window1, type “ant”.

6. This will start the ESB Message “Listeners”. Wait for “**Listener Ready**” to appear on the terminal window. The ESB is now running!

7. Open a 2^nd command terminal window (“Window2”) and change director to samples/quickstarts/helloworld_embedded_reg again.

8. In Window2, type “ant runtest”.

9. Switch back to Window1. You should soon see a “Hello World” message appear in the terminal window.

10. That's it! The QuickStart ran successfully. Your environment is properly configured for JBoss ESB.

Components of the QuickStart

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:

1. 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.

2. 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. See the esb-config-gateway.xml configuration file in the root of the QuickStart.

3. 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.

ESB Aware and Unaware Messages

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.

QuickStart Sequence of Events

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:

1. ESB Unaware JMS Client endpoint puts an ESB Unaware “Hello World” Message (plain String Object) into JMS Queue “queue/quickstart_helloworld_Request”.

2. 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.

3. 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”.

4. The JMS Gateway Listener “adapts” the message into an ESB Aware message and places it into JMS Queue “queue/B”.

5. “FirstService:SimpleJMSService” Service receives the message.

6. “FirstService:SimpleJMSService” Service extracts the payload from the message and prints it to the console.

Chapter 2

TrailBlazer

Overview

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.