Apache Tomcat System Requirements

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Administrative Apps

Internal Servlets

Realm Implementations

The purpose of this specification is to define high level requirements for administrative applications that can be used to manage the operation of a running Tomcat container. A variety of Access Methods to the supported administrative functionality shall be supported, to meet varying requirements:

  • As A Scriptable Web Application - The existing Manager web application provides a simple HTTP-based interface for managing Tomcat through commands that are expressed entirely through a request URI. This is useful in environments where you wish to script administrative commands with tools that can generate HTTP transactions.
  • As An HTML-Based Web Application - Use an HTML presentation to provide a GUI-like user interface for humans to interact with the administrative capabilities.
  • As SOAP-Based Web Services - The operational commands to administer Tomcat are made available as web services that utilize SOAP message formats.
  • As Java Management Extensions (JMX) Commands - The operational commands to administer Tomcat are made available through JMX APIs, for integration into management consoles that utilize them.
  • Other Remote Access APIs - Other remote access APIs, such as JINI, RMI, and CORBA can also be utilized to access administrative capabilities.

Underlying all of the access methods described above, it is assumed that the actual operations are performed either directly on the corresponding Catalina components (such as calling the Deployer.deploy method to deploy a new web application), or through a "business logic" layer that can be shared across all of the access methods. This approach minimizes the cost of adding new administrative capabilities later - it is only necessary to add the corresponding business logic function, and then write adapters to it for all desired access methods.

The current status of this functional specification is PROPOSED. It has not yet been discussed and agreed to on the TOMCAT-DEV mailing list.

The implementation of this functionality shall conform to the following requirements:

  • To the maximum extent feasible, all administrative functions, and the access methods that support them, shall run portably on all platforms where Tomcat itself runs.
  • In a default Tomcat distribution, all administrative capabilities shall be disabled. It shall be necessary for a system administrator to specifically enable the desired access methods (such as by adding a username/password with a specific role to the Tomcat user's database.
  • Administrative functions shall be realized as direct calls to corresponding Catalina APIs, or through a business logic layer that is independent of the access method used to initiate it.
  • The common business logic components shall be implemented in package org.apache.catalina.admin.
  • The common business logic components shall be built as part of the standard Catalina build process, and made visible in the Catalina class loader.
  • The Java components required for each access method shall be implemented in subpackages of org.apache.catalina.admin.
  • The build scripts should treat each access method as optional, so that it will be built only if the corresponding required APIs are present at build time.
  • It shall be possible to save the configured state of the running Tomcat container such that this state can be reproduced when the container is shut down and restarted.
  • Administrative commands to start up and shut down the overall Tomcat container are out of scope for the purposes of these applications. It is assumed that other (usually platform-specific) mechanisms will be used for container startup and shutdown.

The following environmental dependencies must be met in order for administrative applications to operate correctly:

  • For access methods that require creation of server sockets, the appropriate ports must be configured and available.
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