February 2004
Intermediate to advanced
848 pages
27h 25m
English
Content preview from WebLogic: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Structure of a Domain
A domain represents a logical collection of one or more WebLogic server instances and the resources associated with them. It consists of a single Administration Server that allows you to centrally manage a number of other WebLogic servers, called Managed Servers, which may be distributed over several machines. The domain encompasses all of the configuration data for the various machines — the deployments, clusters, physical network characteristics, and health statistics — into a single unit that can be centrally monitored and managed. The Administration Server is responsible for the domain configuration, and maintains the domain configuration data in a configuration file called config.xml. It also hosts the Administration Console, a tool that allows you to manage all Managed Servers, domain resources, application services, and deployed applications.
When a Managed Server starts up, it contacts the Administration Server during its configuration. The Managed Servers are the workhorses of the system — they host the various applications and associated resources and services that are needed. A Managed Server will own resources such as application components (EJBs, servlets, tag libraries), resource adapters, and startup classes. It will host services such as JDBC connection pools, JMS connection factories, JTA transaction services, XML registries, etc., that will be utilized by deployed applications.
Orthogonal to the notion of domains is the concept of a ...
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