# Apache Tomcat 7

Version 7.0.40, May 5 2013

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Top Level Elements

- Server
- Service

Executors

- Executor

Connectors

- HTTP
- AJP

Containers

- Context
- Engine
- Host
- Cluster

Nested Components

- Global Resources
- JarScanner
- Listeners
- Loader
- Manager
- Realm
- Resources
- Valve

Cluster Elements

- Cluster
- Manager
- Channel
- Channel/Membership
- Channel/Sender
- Channel/Receiver
- Channel/Interceptor
- Valve
- Deployer
- ClusterListener

Other

- Filter
- System properties

# The Service Component

Table of Contents

> - Introduction
> - Attributes
>   1. Common Attributes
>   2. Standard Implementation
> - Nested Components
> - Special Features

Introduction

> A Service element represents the combination of one or more Connector components that share a single Engine component for processing incoming requests. One or more Service elements may be nested inside a Server element.

Attributes

> Common Attributes

> > All implementations of Service support the following attributes:

> > Attribute | Description
> > --- | ---
> > `className` | Java class name of the implementation to use. This class must implement the `org.apache.catalina.Service` interface. If no class name is specified, the standard implementation will be used.
> > `name` | The display name of this Service, which will be included in log messages if you utilize standard Catalina components. The name of each Service that is associated with a particular Server must be unique.

> Standard Implementation

> > The standard implementation of Service is org.apache.catalina.core.StandardService. It supports the following additional attributes (in addition to the common attributes listed above):

> > Attribute | Description
> > --- | ---

Nested Components

> The only components that may be nested inside a Service element are one or more Connector elements, followed by exactly one Engine element.

Special Features

> There are no special features associated with a Service.

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