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JBoss ESB 4.2 Milestone Release 3
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Contents
Table of Contents
Contents iv
About
This Guide 5
What This Guide Contains 5
Audience 5
Prerequisites 5
Organization 5
Documentation Conventions 5
Additional Documentation 7
Contacting Us 7
What is the Registry? 9
Introduction 9
Why do I need it ? 9
How do I use it ? 9
Registry Vs Repository 9
SOA components 9
UDDI 10
Configuring the Registry 11
Introduction 11
The components involved 12
The Registry Implementation Class 12
Using JAXR 13
Using Scout and jUDDI 13
Chapter 2 15
Configuration Examples 15
Introduction 15
Embedded 15
RMI using the juddi.war or jbossesb.sar 16
RMI using your own JNDI Registration of the RMI Service 17
2.4 SOAP 19
SAAJ 21
Chapter 3 22
Troubleshooting 22
Scout and jUDDI pitfalls 22
More Information 22
About
This Guide
The Registry Service contains contain important information on changes to JBoss ESB 4.2 Milestone Release 3 since the last release and information on any outstanding issues.
This guide is most relevant to engineers who are responsible for administering JBoss ESB 4.2 Milestone Release 3 installations.
None.
This guide contains the following chapters:
Chapter 1, What is the Registry: an overview of what the registry provides and how it is used in JBossESB.
Chapter 2, Configuration: this chapter contains information on how to configure the registry
Chapter 2, Example Configurations: this chapter illustrates some useful configurations..
Chapter 3, Troubleshooting: information covering how to diagnose and fix common problems.
The following conventions are used in this guide:
|
Convention |
Description |
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Italic |
In paragraph text, italic identifies the titles of documents that are being referenced. When used in conjunction with the Code text described below, italics identify a variable that should be replaced by the user with an actual value. |
|
Bold |
Emphasizes items of particular importance. |
|
Code |
Text that represents programming code. |
|
Function | Function |
A path to a function or dialog box within an interface. For example, “Select File | Open.” indicates that you should select the Open function from the File menu. |
|
( ) and | |
Parentheses enclose optional items in command syntax. The vertical bar separates syntax items in a list of choices. For example, any of the following three items can be entered in this syntax: persistPolicy (Never | OnTimer | OnUpdate | NoMoreOftenThan) |
|
Note: |
A note highlights important supplemental information. A caution highlights procedures or information that is necessary to avoid damage to equipment, damage to software, loss of data, or invalid test results. |
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 Getting Started Guide: Provides a quick start reference to configuring and using 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 Administration Guide: How to manage the ESB.
Questions or comments about JBoss ESB 4.2 Milestone Release 3 should be directed to our support team.
Chapter 1
What is the Registry?
In the context of SOA, a registry provides applications and businesses a central point to store information about their services. It is expected to provide the same level of information and the same breadth of services to its clients as that of a conventional market place. Ideally a registry should also facilitate the automated discovery and execution of e-commerce transactions and enabling a dynamic environment for business transactions. Therefore, a registry is more than an “e-business directory”. It is an inherent component of the SOA infrastructure .
It is not difficult to discover, manage and interface with business partners on a small scale, using manual or ad hoc techniques. However, this approach does not scale as the number of services, the frequency of interactions, the physical distributed nature of the environment, increases. A registry solution based on agreed upon standards provides a common way to publish and discover services. It offers a central place where you query whether a partner has a service that is compatible with in-house technologies or to find a list of companies that supports shipping services on other side of the globe.
The registry may be replicated or federated to improve performance and reliability. It need not be a single point of failure.
From a business analyst’s perspective, it is similar to an Internet search engine for business processes. From a developers perspective, they use the registry to publish services and query the registry to discover services matching various criteria.
A registry allows for the registration of services, discovery of metadata and classification of entities into predefined categories. Unlike a respository, it does not have the ability to store business process definitions or WSDL or any other documents that are required for trading agreements. A registry is essentially a catalogue of items, whereas a repository maintaines those items.
As the W3C puts it: An SOA is a specific type of distributed system in which the agents are "services" (http://www.w3.org/TR/2003/WD-ws-arch-20030808/#id2617708).
The key components of a Service Oriented Architecture are the messages that are exchanged, agents that act as service requesters and service providers, and shared transport mechanisms that allow the flow of messages. A description of a service that exists within an SOA is essentially just a description of the message exchange patter between itself and its users. Within an SOA there are thus three critical roles: requester, provider, and broker.
Service provider: allows access to services, creates a description of a service and publishes it to the service broker.
Service broker: hosts a registry of service descriptions. It is responsible for linking a requestor to a service provider.
Service requester: is responsible for discovering a service by searching through the service descriptions given by the service broker. A requestor is also responsible for binding to services provided by the service provider.
The Universal Distribution, Discover and Interoperability registry is a directory service for Web Services. It enables service discovery through queries to the UDDI registry at design time or at run time. It also allows providers to publish descriptions of their services to the registry. The registry typically contains a URL that locates the WSDL document for the web services and contact information for the service provider. Within UDDI information is classified into the following categories.
White pages: contain general information such as the name, address and other contact information about the company providing the service.
Yellow pages: categorise businesses based on the industry their services cater to.
Green pages: provide information that will enable a client to bind to the service that is being provided.
Chapter 2
Configuring the Registry
The JBossESB Registry architecture allows for many ways to configure the ESB to use either a Registry or Repository. By default the we use a JAXR implementation (Scout) and a UDDI (jUDDI), in an embedded way.
The following properties can be used to configure the JBossESB Registry. In the jbossesb-properties.xml there is section called 'registry':
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="org.apache.juddi.registry.local.InquiryService#inquire"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="org.apache.juddi.registry.local.PublishService#publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.LocalTransport"/>
</properties>
In short, the properties are
org.jboss.soa.esb.registry.implementationClass, a class that implements the jbossesb Registry interface. We have provided one implementation (JAXRRegistry interface).
org.jboss.soa.esb.registry.factoryClass, the class name of the JAXR ConnectionFactory implementation.
org.jboss.soa.esb.registry.queryManagerURI, the URI used by JAXR to query.
org.jboss.soa.esb.registry.lifeCycleManagerURI, the URI used by JAXR to edit.
org.jboss.soa.esb.registry.user, the user used for edits.
org.jboss.soa.esb.registry.password, the password to go along with the user.
org.jboss.soa.esb.scout.proxy.transportClass, the name of the class used by scout to do the transport from scout to the UDDI.
The registry can be configured in many ways. Figure 1 shows a blue print of all the registry components. From the top down we can see that the JBossESB funnels all interaction with the registry through the Registry Interface. By default it then calls into a JAXR implementation of this interface. The JAXR API needs an implementation, which by default is Scout. The Scout JAXR implementation calls into a jUDDI registry. However there are many other configuration options.
Figure
1. Blue print of the Registry component architecture.
Property: org.jboss.soa.esb.registry.implementationClass
By default we use the JAXR API. The JAXR API is a convenient API since it allows us to connect any kind of XML based registry or repository. However, if for example you want to use Systinet's Java API you can do that by writing your own SystinetRegistryImplentation class and referencing it in this property.
Propery: org.jboss.soa.esb.registry.factoryClass
If you decided to use JAXR then you will have to pick which JAXR implementation to use. This property is used to configure that class. By default we use Scout and therefore it is set to the scout factory 'org.apache.ws.scout.registry.ConnectionFactoryImpl'. The next step is to tell the JAXR implementation the location of the registry or repository for querying and updating, which is done by setting the org.jboss.soa.esb.registry.queryManagerURI, and org.jboss.soa.esb.registry.lifeCycleManagerURI respectively, along with the username (org.jboss.soa.esb.registry.user) and password (org.jboss.soa.esb.registry.password) for the UDDI.
Property: org.jboss.soa.esb.scout.proxy.transportClass
When using Scout and jUDDI there is an additonal parameter that one can set. This is the transport class that should be used for communication between Scout and jUDDI. Thus far there are 4 implementations of this class which are based on SOAP, SAAJ, RMI and Local (embedded java). Note that when you change the transport, you will also have to change the query and lifecycle URIs. For example:
SOAP
queryManagerURI http://localhost:8080/juddi/inquiry
lifeCycleManagerURI http://localhost:8080/juddi/publish
transportClass org.apache.ws.scout.transport.AxisTransport
RMI
queryManagerURI jnp://localhost:1099/InquiryService?org.apache.juddi.registry.rmi.Inquiry#inquire
lifeCycleManagerURI jnp://localhost:1099/PublishService?org.apache.juddi.registry.rmi.Publish#publish
transportClass org.apache.ws.scout.transport.RMITransport
Local
queryManagerURI org.apache.juddi.registry.local.InquiryService#inquire
lifeCycleManagerURI org.apache.juddi.registry.local.PublishService#publish
transportClass org.apache.ws.scout.transport.LocalTransport
For jUDDI we have two requirements that need to be fulfilled:
access to the juddi database. You will need to create a schema in your database, and add the jbossesb publisher. The product/install/jUDDI-registry directory contains db create scripts for you favority database.
juddi.properties. The configuration of jUDDI itself. If you do not use a datasource you need to take special care to set the following properties:
juddi.isUseDataSource=false
juddi.jdbcDriver=com.mysql.jdbc.Driver
juddi.jdbcUrl=jdbc:mysql://localhost/juddi
juddi.jdbcUsername=juddi
juddi.jdbcPassword=juddi
if you do use a datasource you need something like
juddi.isUseDataSource=true
juddi.dataSource=java:comp/env/jdbc/juddiDB
Chapter 2
Configuration Examples
As mentioned before, by default the JBossESB is configured to use the JAXR API using Scout as its implementation and jUDDI as the registry. Here are some example how you can use deploy this combo.
All ESB components (with components we really mean JVMs in this case) can embed the registry and they all can connect to the same database (or different once if that makes sense).
Figure
2. Embedded jUDDI.
Properties example:
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="org.apache.juddi.registry.local.InquiryService#inquire"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="org.apache.juddi.registry.local.PublishService#publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.LocalTransport"/>
</properties>
Deploy a version of the jUDDI that brings up an RMI service. The JBossESB comes with a juddi.war in the product/install/jUDDI-registry directory. This war brings up the regular webservices but also an RMI service. Along with the juddi.war you need to deploy a datasource which points to your jUDDI database. An example file is supplied for mysql. Note that the jbossesb.sar also registers a rmi service. So you'd only need to deploy the juddi.war if you need webservice access.
Figure
3. RMI using the juddi.war
Properties example:
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="jnp://localhost:1099/InquiryService?org.apache.juddi.registry.rmi.Inquiry#inquire"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="jnp://localhost:1099/PublishService?org.apache.juddi.registry.rmi.Publish#publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.RMITransport"/>
The juddi.war is configured to bring up a RMI Service, which is triggered by the following setting in the web.xml
<!-- uncomment if you want to enable making calls in juddi with rmi -->
<servlet>
<servlet-name>RegisterServicesWithJNDI</servlet-name>
<servlet-class>org.apache.juddi.registry.rmi.RegistrationService</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
Make sure to include -for example- the following JNDI settings in your juddi.properties:
# JNDI settings (used by RMITransport)
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=jnp://localhost:1099
java.naming.factory.url.pkgs=org.jboss.naming
The RMI clients need to have the scout-client.jar in their classpath.
If you don't want to deploy the juddi.war you can setup one of the ESB components that runs in the the same JVM as jUDDI to register the RMI service.While the other applications need to be configured to use RMI.
Figure
4. RMI using your own JNDI registration
Properties example: For application 1 you need need the Local settings:
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="org.apache.juddi.registry.local.InquiryService#inquire"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="org.apache.juddi.registry.local.PublishService#publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.LocalTransport"/>
</properties>
while for application2 you need the RMI settings:
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="jnp://localhost:1099/InquiryService?org.apache.juddi.registry.rmi.Inquiry#inquire"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="jnp://localhost:1099/PublishService?org.apache.juddi.registry.rmi.Publish#publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.RMITransport"/>
Where the hostname of the queryManagerURI and lifeCycleManagerURI need to point to the hostname on which jUDDI is running (which would be where application1 is running). Obviously application1 needs to have access to a naming service. To do the registration process you need to do something like:
//Getting the JNDI setting from the config
String factoryInitial = Config.getStringProperty(
Properties env = new Properties();
env.setProperty(RegistryEngine.PROPNAME_JAVA_NAMING_FACTORY_INITIAL,factoryInitial);
env.setProperty(RegistryEngine.PROPNAME_JAVA_NAMING_PROVIDER_URL, providerURL);
env.setProperty(RegistryEngine.PROPNAME_JAVA_NAMING_FACTORY_URL_PKGS, factoryURLPkgs);
log.info("Creating Initial Context using: \n"
+ RegistryEngine.PROPNAME_JAVA_NAMING_FACTORY_INITIAL + "=" + factoryInitial + "\n"
+ RegistryEngine.PROPNAME_JAVA_NAMING_PROVIDER_URL + "=" + providerURL + "\n"
+ RegistryEngine.PROPNAME_JAVA_NAMING_FACTORY_URL_PKGS + "=" + factoryURLPkgs + "\n");
InitialContext context = new InitialContext(env);
Inquiry inquiry = new InquiryService();
log.info("Setting " + INQUIRY_SERVICE + ", " + inquiry.getClass().getName());
mInquery = inquiry;
context.bind(INQUIRY_SERVICE, inquiry);
Publish publish = new PublishService();
log.info("Setting " + PUBLISH_SERVICE + ", " + publish.getClass().getName());
mPublish = publish;
context.bind(PUBLISH_SERVICE, publish);
Finally, you can make the communication between Scout and jUDDI SOAP based. Again you need to deploy the juddi.war and configure the datasource. You probably want to shutdown the RMI service by commenting out the RegisterServicesWithJNDI servlet in the web.xml.
Figure 5. SOAP.
Properties example:
<properties name="registry">
<property name="org.jboss.soa.esb.registry.implementationClass" value="org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl"/>
<property name="org.jboss.soa.esb.registry.factoryClass" value="org.apache.ws.scout.registry.ConnectionFactoryImpl"/>
<property name="org.jboss.soa.esb.registry.queryManagerURI" value="http://localhost:8080/juddi/inquiry"/>
<property name="org.jboss.soa.esb.registry.lifeCycleManagerURI" value="http://localhost:8080/juddi/publish"/>
<property name="org.jboss.soa.esb.registry.user" value="jbossesb"/>
<property name="org.jboss.soa.esb.registry.password" value="password"/>
<!-- the following parameter is scout specific to set the type of communication between scout and the UDDI (embedded, rmi, soap) -->
<property name="org.jboss.soa.esb.scout.proxy.transportClass" value="org.apache.ws.scout.transport.AxisTransport"/>
JBoss 4.0.x comes with scout and juddi. If you run in clustered mode ('all'). It brings up the jUDDI registry to which you can communicate using SAAJ. This is an untested feature.
Chapter 3
Troubleshooting
Make sure to put our version of the jaxr-api-1.0.jar, scout-0.7rc2-embedded.jar and the juddi-embedded.jar first. Other versions of these libraries are present in the JbossAS libraries and they are, for the time being, incompatible. This should get resolved in future release of the Application Server.
If you use RMI you need the juddi-client.jar.
Make sure the jbossesb-properties.xml file is on the classpath and read or else the registry will try to instantiate classes with the name of 'null'.
Make sure you have a juddi.properties file on your classpath for jUDDI to configure itself.
Make sure to read the README in the product/install/jUDDI-registry directory, to prepopulate your own juddi database.
In the event that a service fails or does not shut down cleanly, it is possible that stale entries may persist within a registry. You will have to remove these manually.
For more information see the wiki http://labs.jboss.com/wiki/JudyEvaluation
JBossESB user forum: http://www.jboss.com/index.html?module=bb&op=viewforum&f=246
When you deploy the juddi.war that ship with our esb, you enable access through soap, which means that you can use any uddi brower. You can use http://uddibrowser.org
JBESB-RS-
